diff --git a/core/lib/Drupal/Core/Field/Annotation/FieldType.php b/core/lib/Drupal/Core/Field/Annotation/FieldType.php
index 13feaae..3b306c9 100644
--- a/core/lib/Drupal/Core/Field/Annotation/FieldType.php
+++ b/core/lib/Drupal/Core/Field/Annotation/FieldType.php
@@ -52,23 +52,6 @@ class FieldType extends DataType {
   public $description;
 
   /**
-   * An array of instance-level settings available for the field type.
-   *
-   * Keys are the names of the settings, and values are the default values for
-   * those settings.
-   *
-   * Instance-level settings can have different values on each field instance,
-   * and thus allow greater flexibility than field-level settings. It is
-   * recommended to put settings at the instance level whenever possible.
-   * Notable exceptions: settings acting on the storage schema, or settings that
-   * Views needs to use across field instances (for example, settings defining
-   * the list of allowed values for the field).
-   *
-   * @var array
-   */
-  public $instance_settings;
-
-  /**
    * The plugin_id of the default widget for this field type.
    *
    * This widget must be available whenever the field type is available (i.e.
diff --git a/core/lib/Drupal/Core/Field/FieldItemBase.php b/core/lib/Drupal/Core/Field/FieldItemBase.php
index 5802b4a..cff21f1 100644
--- a/core/lib/Drupal/Core/Field/FieldItemBase.php
+++ b/core/lib/Drupal/Core/Field/FieldItemBase.php
@@ -33,6 +33,13 @@ public static function settings() {
   /**
    * {@inheritdoc}
    */
+  public static function instanceSettings() {
+    return array();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public static function mainPropertyName() {
     return 'value';
   }
diff --git a/core/lib/Drupal/Core/Field/FieldItemInterface.php b/core/lib/Drupal/Core/Field/FieldItemInterface.php
index 579f0d4..94f71b7 100644
--- a/core/lib/Drupal/Core/Field/FieldItemInterface.php
+++ b/core/lib/Drupal/Core/Field/FieldItemInterface.php
@@ -221,6 +221,14 @@ public function deleteRevision();
   public static function settings();
 
   /**
+   * Defines the instance-level settings for this plugin.
+   *
+   * @return array
+   *   A list of default settings, keyed by the setting name.
+   */
+  public static function instanceSettings();
+
+  /**
    * Returns a form for the field-level settings.
    *
    * Invoked from \Drupal\field_ui\Form\FieldEditForm to allow administrators to
diff --git a/core/lib/Drupal/Core/Field/FieldTypePluginManager.php b/core/lib/Drupal/Core/Field/FieldTypePluginManager.php
index f719aaf..e615c99 100644
--- a/core/lib/Drupal/Core/Field/FieldTypePluginManager.php
+++ b/core/lib/Drupal/Core/Field/FieldTypePluginManager.php
@@ -19,13 +19,6 @@
 class FieldTypePluginManager extends DefaultPluginManager implements FieldTypePluginManagerInterface {
 
   /**
-   * {@inheritdoc}
-   */
-  protected $defaults = array(
-    'instance_settings' => array(),
-  );
-
-  /**
    * Constructs the FieldTypePluginManager object
    *
    * @param \Traversable $namespaces
@@ -70,8 +63,12 @@ public function getDefaultSettings($type) {
    * {@inheritdoc}
    */
   public function getDefaultInstanceSettings($type) {
-    $info = $this->getDefinition($type);
-    return isset($info['instance_settings']) ? $info['instance_settings'] : array();
+    $plugin_definition = $this->getDefinition($type);
+    if (!empty($plugin_definition['class'])) {
+      $plugin_class = DefaultFactory::getPluginClass($type, $plugin_definition);
+      return $plugin_class::instanceSettings();
+    }
+    return array();
   }
 
   /**
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/DecimalItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/DecimalItem.php
index 86dfa01..95b04a6 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/DecimalItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/DecimalItem.php
@@ -17,12 +17,6 @@
  *   id = "decimal",
  *   label = @Translation("Number (decimal)"),
  *   description = @Translation("This field stores a number in the database in a fixed decimal format."),
- *   instance_settings = {
- *     "min" = "",
- *     "max" = "",
- *     "prefix" = "",
- *     "suffix" = ""
- *   },
  *   default_widget = "number",
  *   default_formatter = "number_decimal"
  * )
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
index 524ccd3..51cc1ce 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
@@ -35,6 +35,26 @@ class EntityReferenceItem extends FieldItemBase {
   /**
    * {@inheritdoc}
    */
+  public static function settings() {
+    $settings = parent::settings();
+    $settings['target_type'] = \Drupal::moduleHandler()->moduleExists('node') ? 'node' : 'user';
+    $settings['target_bundle'] = NULL;
+    return $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function instanceSettings() {
+    $settings = parent::instanceSettings();
+    $settings['handler'] = 'default';
+    $settings['handler_settings'] = array();
+    return $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public static function propertyDefinitions(FieldDefinitionInterface $field_definition) {
     $settings = $field_definition->getSettings();
     $target_type_info = \Drupal::entityManager()->getDefinition($settings['target_type']);
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/FloatItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/FloatItem.php
index 2d9511b..eda49cc 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/FloatItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/FloatItem.php
@@ -17,12 +17,6 @@
  *   id = "float",
  *   label = @Translation("Number (float)"),
  *   description = @Translation("This field stores a number in the database in a floating point format."),
- *   instance_settings = {
- *     "min" = "",
- *     "max" = "",
- *     "prefix" = "",
- *     "suffix" = ""
- *   },
  *   default_widget = "number",
  *   default_formatter = "number_decimal"
  * )
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/IntegerItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/IntegerItem.php
index 31f3bc6..f22e060 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/IntegerItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/IntegerItem.php
@@ -17,12 +17,6 @@
  *   id = "integer",
  *   label = @Translation("Number (integer)"),
  *   description = @Translation("This field stores a number in the database as an integer."),
- *   instance_settings = {
- *     "min" = "",
- *     "max" = "",
- *     "prefix" = "",
- *     "suffix" = ""
- *   },
  *   default_widget = "number",
  *   default_formatter = "number_integer"
  * )
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/NumericItemBase.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/NumericItemBase.php
index c1270c4..6b32396 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/NumericItemBase.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/NumericItemBase.php
@@ -17,6 +17,18 @@
   /**
    * {@inheritdoc}
    */
+  public static function instanceSettings() {
+    $settings = parent::instanceSettings();
+    $settings['min'] = '';
+    $settings['max'] = '';
+    $settings['prefix'] = '';
+    $settings['suffix'] = '';
+    return $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function instanceSettingsForm(array $form, array &$form_state) {
     $element = array();
     $settings = $this->getSettings();
diff --git a/core/modules/comment/lib/Drupal/comment/Plugin/Field/FieldType/CommentItem.php b/core/modules/comment/lib/Drupal/comment/Plugin/Field/FieldType/CommentItem.php
index 0a41d3d..170e0bb 100644
--- a/core/modules/comment/lib/Drupal/comment/Plugin/Field/FieldType/CommentItem.php
+++ b/core/modules/comment/lib/Drupal/comment/Plugin/Field/FieldType/CommentItem.php
@@ -18,14 +18,6 @@
  *   id = "comment",
  *   label = @Translation("Comments"),
  *   description = @Translation("This field manages configuration and presentation of comments on an entity."),
- *   instance_settings = {
- *     "default_mode" = COMMENT_MODE_THREADED,
- *     "per_page" = 50,
- *     "form_location" = COMMENT_FORM_BELOW,
- *     "anonymous" = COMMENT_ANONYMOUS_MAYNOT_CONTACT,
- *     "subject" = 1,
- *     "preview" = DRUPAL_OPTIONAL,
- *   },
  *   default_widget = "comment_default",
  *   default_formatter = "comment_default"
  * )
@@ -44,6 +36,20 @@ public static function settings() {
   /**
    * {@inheritdoc}
    */
+  public static function instanceSettings() {
+    $settings = parent::instanceSettings();
+    $settings['default_mode'] = COMMENT_MODE_THREADED;
+    $settings['per_page'] = 50;
+    $settings['form_location'] = COMMENT_FORM_BELOW;
+    $settings['anonymous'] = COMMENT_ANONYMOUS_MAYNOT_CONTACT;
+    $settings['subject'] = 1;
+    $settings['preview'] = DRUPAL_OPTIONAL;
+    return $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public static function propertyDefinitions(FieldDefinitionInterface $field_definition) {
     $properties['status'] = DataDefinition::create('integer')
       ->setLabel(t('Comment status value'));
diff --git a/core/modules/entity_reference/entity_reference.module b/core/modules/entity_reference/entity_reference.module
index 4f15acd..5d29011 100644
--- a/core/modules/entity_reference/entity_reference.module
+++ b/core/modules/entity_reference/entity_reference.module
@@ -43,9 +43,6 @@ function entity_reference_field_info_alter(&$info) {
   $info['entity_reference']['configurable'] = TRUE;
   $info['entity_reference']['class'] = '\Drupal\entity_reference\ConfigurableEntityReferenceItem';
   $info['entity_reference']['list_class'] = '\Drupal\entity_reference\Plugin\Field\FieldType\ConfigurableEntityReferenceFieldItemList';
-  $info['entity_reference']['settings']['target_type'] = \Drupal::moduleHandler()->moduleExists('node') ? 'node' : 'user';
-  $info['entity_reference']['instance_settings']['handler'] = 'default';
-  $info['entity_reference']['instance_settings']['handler_settings'] = array();
   $info['entity_reference']['default_widget'] = 'entity_reference_autocomplete';
   $info['entity_reference']['default_formatter'] = 'entity_reference_label';
   $info['entity_reference']['provider'] = 'entity_reference';
diff --git a/core/modules/field/lib/Drupal/field/Entity/FieldConfig.php b/core/modules/field/lib/Drupal/field/Entity/FieldConfig.php
index 061817a..92d5342 100644
--- a/core/modules/field/lib/Drupal/field/Entity/FieldConfig.php
+++ b/core/modules/field/lib/Drupal/field/Entity/FieldConfig.php
@@ -513,11 +513,12 @@ public function getSettings() {
     $field_type_info = \Drupal::service('plugin.manager.field.field_type')->getDefinition($this->type);
 
     $settings = array();
+    $instance_settings = array();
     if (isset($field_type_info['class'])) {
       $settings = $field_type_info['class']::settings();
+      $instance_settings = $field_type_info['class']::instanceSettings();
     }
-    // @todo Convert instance settings to method.
-    return $this->settings + $settings + $field_type_info['instance_settings'];
+    return $this->settings + $settings + $instance_settings;
   }
 
   /**
@@ -525,18 +526,14 @@ public function getSettings() {
    */
   public function getSetting($setting_name) {
     // @todo See getSettings() about potentially statically caching this.
-    $field_type_info = \Drupal::service('plugin.manager.field.field_type')->getDefinition($this->type);
-
     // We assume here that consecutive array_key_exists() is more efficient than
     // calling getSettings() when all we need is a single setting.
     if (array_key_exists($setting_name, $this->settings)) {
       return $this->settings[$setting_name];
     }
-    elseif (array_key_exists($setting_name, $field_type_info['settings'])) {
-      return $field_type_info['settings'][$setting_name];
-    }
-    elseif (array_key_exists($setting_name, $field_type_info['instance_settings'])) {
-      return $field_type_info['instance_settings'][$setting_name];
+    $settings = $this->getSettings();
+    if (array_key_exists($setting_name, $settings)) {
+      return $settings[$setting_name];
     }
     else {
       return NULL;
diff --git a/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/Plugin/Field/FieldType/TestItem.php b/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/Plugin/Field/FieldType/TestItem.php
index a608ec2..aad9bbc 100644
--- a/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/Plugin/Field/FieldType/TestItem.php
+++ b/core/modules/field/tests/modules/field_test/lib/Drupal/field_test/Plugin/Field/FieldType/TestItem.php
@@ -19,10 +19,6 @@
  *   id = "test_field",
  *   label = @Translation("Test field"),
  *   description = @Translation("Dummy field type used for tests."),
- *   instance_settings = {
- *     "test_instance_setting" = "dummy test string",
- *     "test_cached_data" = FALSE
- *   },
  *   default_widget = "test_field_widget",
  *   default_formatter = "field_test_default"
  * )
@@ -43,6 +39,16 @@ public static function settings() {
   /**
    * {@inheritdoc}
    */
+  public static function instanceSettings() {
+    $settings = parent::instanceSettings();
+    $settings['test_instance_setting'] = 'dummy test string';
+    $settings['test_cached_data'] = FALSE;
+    return $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public static function propertyDefinitions(FieldDefinitionInterface $field_definition) {
     $properties['value'] = DataDefinition::create('integer')
       ->setLabel(t('Test integer value'));
diff --git a/core/modules/file/file.field.inc b/core/modules/file/file.field.inc
index a3c7140..7d106ae 100644
--- a/core/modules/file/file.field.inc
+++ b/core/modules/file/file.field.inc
@@ -9,16 +9,6 @@
 use Drupal\field\FieldConfigInterface;
 
 /**
- * Implements hook_field_info_alter().
- *
- * Cannot annotate in FieldItem plugin the settings.uri_scheme meta data key
- * with a dynamic value. We need to alter the value here.
- */
-function file_field_info_alter(&$info) {
-  $info['file']['settings']['uri_scheme'] = file_default_scheme();
-}
-
-/**
  * Returns HTML for an individual file upload widget.
  *
  * @param $variables
diff --git a/core/modules/file/lib/Drupal/file/Plugin/Field/FieldType/FileItem.php b/core/modules/file/lib/Drupal/file/Plugin/Field/FieldType/FileItem.php
index 77379de..4f15c74 100644
--- a/core/modules/file/lib/Drupal/file/Plugin/Field/FieldType/FileItem.php
+++ b/core/modules/file/lib/Drupal/file/Plugin/Field/FieldType/FileItem.php
@@ -18,12 +18,6 @@
  *   id = "file",
  *   label = @Translation("File"),
  *   description = @Translation("This field stores the ID of a file as an integer value."),
- *   instance_settings = {
- *     "file_extensions" = "txt",
- *     "file_directory" = "",
- *     "max_filesize" = "",
- *     "description_field" = "0"
- *   },
  *   default_widget = "file_generic",
  *   default_formatter = "file_default",
  *   list_class = "\Drupal\file\Plugin\Field\FieldType\FileFieldItemList"
@@ -39,7 +33,19 @@ public static function settings() {
     $settings['target_type'] = 'file';
     $settings['display_field'] = 0;
     $settings['display_default'] = 0;
-    $settings['uri_scheme'] = '';
+    $settings['uri_scheme'] = file_default_scheme();
+    return $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function instanceSettings() {
+    $settings = parent::instanceSettings();
+    $settings['file_extensions'] = 'txt';
+    $settings['file_directory'] = '';
+    $settings['max_filesize'] = '';
+    $settings['description_field'] = 0;
     return $settings;
   }
 
diff --git a/core/modules/image/image.field.inc b/core/modules/image/image.field.inc
index 4407563..5462520 100644
--- a/core/modules/image/image.field.inc
+++ b/core/modules/image/image.field.inc
@@ -8,13 +8,6 @@
 use Drupal\Component\Utility\NestedArray;
 
 /**
- * Implements hook_field_info_alter().
- */
-function image_field_info_alter(&$info) {
-  $info['image']['settings']['uri_scheme'] = file_default_scheme();
-}
-
-/**
  * Returns HTML for an image field widget.
  *
  * @param array $variables
diff --git a/core/modules/image/lib/Drupal/image/Plugin/Field/FieldType/ImageItem.php b/core/modules/image/lib/Drupal/image/Plugin/Field/FieldType/ImageItem.php
index 6162a41..62ce6ad 100644
--- a/core/modules/image/lib/Drupal/image/Plugin/Field/FieldType/ImageItem.php
+++ b/core/modules/image/lib/Drupal/image/Plugin/Field/FieldType/ImageItem.php
@@ -18,24 +18,6 @@
  *   id = "image",
  *   label = @Translation("Image"),
  *   description = @Translation("This field stores the ID of an image file as an integer value."),
- *   instance_settings = {
- *     "file_extensions" = "png gif jpg jpeg",
- *     "file_directory" = "",
- *     "max_filesize" = "",
- *     "alt_field" = "0",
- *     "alt_field_required" = "0",
- *     "title_field" = "0",
- *     "title_field_required" = "0",
- *     "max_resolution" = "",
- *     "min_resolution" = "",
- *     "default_image" = {
- *       "fid" = NULL,
- *       "alt" = "",
- *       "title" = "",
- *       "width" = NULL,
- *       "height" = NULL
- *     }
- *   },
  *   default_widget = "image_image",
  *   default_formatter = "image",
  *   list_class = "\Drupal\file\Plugin\Field\FieldType\FileFieldItemList"
@@ -48,8 +30,6 @@ class ImageItem extends FileItem {
    */
   public static function settings() {
     $settings = parent::settings();
-    $settings['target_type'] = 'file';
-    $settings['uri_scheme'] = '';
     $settings['default_image'] = array(
       'fid' => NULL,
       'alt' => '',
@@ -77,6 +57,28 @@ public static function settings() {
   /**
    * {@inheritdoc}
    */
+  public static function instanceSettings() {
+    $settings = parent::instanceSettings();
+    unset($settings['description_field']);
+    $settings['file_extensions'] = 'png gif jpg jpeg';
+    $settings['alt_field'] = 0;
+    $settings['alt_field_required'] = 0;
+    $settings['title_field'] = 0;
+    $settings['title_field_required'] = 0;
+    $settings['max_resolution'] = '';
+    $settings['min_resolution'] = '';
+    $settings['default_image'] = array(
+      'fid' => NULL,
+      'alt' => '',
+      'width' => NULL,
+      'height' => NULL,
+    );
+    return $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
diff --git a/core/modules/link/lib/Drupal/link/Plugin/Field/FieldType/LinkItem.php b/core/modules/link/lib/Drupal/link/Plugin/Field/FieldType/LinkItem.php
index e9aff29..726446e 100644
--- a/core/modules/link/lib/Drupal/link/Plugin/Field/FieldType/LinkItem.php
+++ b/core/modules/link/lib/Drupal/link/Plugin/Field/FieldType/LinkItem.php
@@ -19,9 +19,6 @@
  *   id = "link",
  *   label = @Translation("Link"),
  *   description = @Translation("Stores a URL string, optional varchar link text, and optional blob of attributes to assemble a link."),
- *   instance_settings = {
- *     "title" = "1"
- *   },
  *   default_widget = "link_default",
  *   default_formatter = "link"
  * )
@@ -31,6 +28,15 @@ class LinkItem extends FieldItemBase {
   /**
    * {@inheritdoc}
    */
+  public static function instanceSettings() {
+    $settings = parent::instanceSettings();
+    $settings['title'] = 1;
+    return $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public static function propertyDefinitions(FieldDefinitionInterface $field_definition) {
     $properties['url'] = DataDefinition::create('uri')
       ->setLabel(t('URL'));
diff --git a/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListBooleanItem.php b/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListBooleanItem.php
index b283d7f..a884a53 100644
--- a/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListBooleanItem.php
+++ b/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListBooleanItem.php
@@ -19,11 +19,7 @@
  *   label = @Translation("Boolean"),
  *   description = @Translation("This field stores simple on/off or yes/no options."),
  *   default_widget = "options_buttons",
- *   default_formatter = "list_default",
- *   settings = {
- *     "allowed_values" = { },
- *     "allowed_values_function" = ""
- *   }
+ *   default_formatter = "list_default"
  * )
  */
 class ListBooleanItem extends ListItemBase {
diff --git a/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListFloatItem.php b/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListFloatItem.php
index cfd9251..66d59a6 100644
--- a/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListFloatItem.php
+++ b/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListFloatItem.php
@@ -19,11 +19,7 @@
  *   label = @Translation("List (float)"),
  *   description = @Translation("This field stores float values from a list of allowed 'value => label' pairs, i.e. 'Fraction': 0 => 0, .25 => 1/4, .75 => 3/4, 1 => 1."),
  *   default_widget = "options_select",
- *   default_formatter = "list_default",
- *   settings = {
- *     "allowed_values" = { },
- *     "allowed_values_function" = ""
- *   }
+ *   default_formatter = "list_default"
  * )
  */
 class ListFloatItem extends ListItemBase {
diff --git a/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListIntegerItem.php b/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListIntegerItem.php
index ea28a94..5b963c6 100644
--- a/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListIntegerItem.php
+++ b/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListIntegerItem.php
@@ -19,11 +19,7 @@
  *   label = @Translation("List (integer)"),
  *   description = @Translation("This field stores integer values from a list of allowed 'value => label' pairs, i.e. 'Lifetime in days': 1 => 1 day, 7 => 1 week, 31 => 1 month."),
  *   default_widget = "options_select",
- *   default_formatter = "list_default",
- *   settings = {
- *     "allowed_values" = { },
- *     "allowed_values_function" = ""
- *   }
+ *   default_formatter = "list_default"
  * )
  */
 class ListIntegerItem extends ListItemBase {
diff --git a/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListItemBase.php b/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListItemBase.php
index de95075..f6e544b 100644
--- a/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListItemBase.php
+++ b/core/modules/options/lib/Drupal/options/Plugin/Field/FieldType/ListItemBase.php
@@ -20,6 +20,16 @@
   /**
    * {@inheritdoc}
    */
+  public static function settings() {
+    $settings = parent::settings();
+    $settings['allowed_values'] = array();
+    $settings['allowed_values_function'] = '';
+    return $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function getPossibleValues(AccountInterface $account = NULL) {
     // Flatten options firstly, because Possible Options may contain group
     // arrays.
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceItem.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceItem.php
index bacc4ef..aa8a1f9 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceItem.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/Field/FieldType/TaxonomyTermReferenceItem.php
@@ -19,7 +19,6 @@
  *   id = "taxonomy_term_reference",
  *   label = @Translation("Term Reference"),
  *   description = @Translation("This field stores a reference to a taxonomy term."),
- *   instance_settings = { },
  *   default_widget = "options_select",
  *   default_formatter = "taxonomy_term_reference_link",
  *   list_class = "\Drupal\taxonomy\Plugin\Field\FieldType\TaxonomyTermReferenceFieldItemList"
diff --git a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextItem.php b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextItem.php
index 0eee199..67d0f3a 100644
--- a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextItem.php
+++ b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextItem.php
@@ -16,9 +16,6 @@
  *   id = "text",
  *   label = @Translation("Text"),
  *   description = @Translation("This field stores varchar text in the database."),
- *   instance_settings = {
- *     "text_processing" = "0"
- *   },
  *   default_widget = "text_textfield",
  *   default_formatter = "text_default"
  * )
diff --git a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextItemBase.php b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextItemBase.php
index 0c85997..b7a1d7a 100644
--- a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextItemBase.php
+++ b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextItemBase.php
@@ -20,6 +20,15 @@
   /**
    * {@inheritdoc}
    */
+  public static function instanceSettings() {
+    $settings = parent::instanceSettings();
+    $settings['text_processing'] = 0;
+    return $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public static function propertyDefinitions(FieldDefinitionInterface $field_definition) {
     $properties['value'] = DataDefinition::create('string')
       ->setLabel(t('Text value'));
diff --git a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextLongItem.php b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextLongItem.php
index 934d11f..1cf0385 100644
--- a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextLongItem.php
+++ b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextLongItem.php
@@ -16,9 +16,6 @@
  *   id = "text_long",
  *   label = @Translation("Long text"),
  *   description = @Translation("This field stores long text in the database."),
- *   instance_settings = {
- *     "text_processing" = "0"
- *   },
  *   default_widget = "text_textarea",
  *   default_formatter = "text_default"
  * )
diff --git a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextWithSummaryItem.php b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextWithSummaryItem.php
index 5fe30fc..a645b53 100644
--- a/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextWithSummaryItem.php
+++ b/core/modules/text/lib/Drupal/text/Plugin/Field/FieldType/TextWithSummaryItem.php
@@ -17,10 +17,6 @@
  *   id = "text_with_summary",
  *   label = @Translation("Long text and summary"),
  *   description = @Translation("This field stores long text in the database along with optional summary text."),
- *   instance_settings = {
- *     "text_processing" = "1",
- *     "display_summary" = "0"
- *   },
  *   default_widget = "text_textarea_with_summary",
  *   default_formatter = "text_default"
  * )
@@ -30,6 +26,16 @@ class TextWithSummaryItem extends TextItemBase {
   /**
    * {@inheritdoc}
    */
+  public static function instanceSettings() {
+    $settings = parent::instanceSettings();
+    $settings['text_processing'] = 1;
+    $settings['display_summary'] = 0;
+    return $settings;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public static function propertyDefinitions(FieldDefinitionInterface $field_definition) {
     $properties = parent::propertyDefinitions($field_definition);