diff --git a/core/includes/form.inc b/core/includes/form.inc
index 8170820..cd104cb 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -239,6 +239,12 @@ function template_preprocess_details(&$variables) {
   $variables['description'] = (!empty($element['#description'])) ? $element['#description'] : '';
   $variables['children'] = (isset($element['#children'])) ? $element['#children'] : '';
   $variables['value'] = (isset($element['#value'])) ? $element['#value'] : '';
+
+  // Display any error messages.
+  $variables['errors'] = NULL;
+  if (!empty($element['#errors']) && empty($element['#error_no_message'])) {
+    $variables['errors'] = $element['#errors'];
+  }
 }
 
 /**
diff --git a/core/modules/system/templates/details.html.twig b/core/modules/system/templates/details.html.twig
index 1c0fd79..cf50eb0 100644
--- a/core/modules/system/templates/details.html.twig
+++ b/core/modules/system/templates/details.html.twig
@@ -5,6 +5,7 @@
  *
  * Available variables
  * - attributes: A list of HTML attributes for the details element.
+ * - errors: (optional) Any errors for this details element, may not be set.
  * - title: (optional) The title of the element, may not be set.
  * - description: (optional) The description of the element, may not be set.
  * - children: (optional) The children of the element, may not be set.
@@ -20,6 +21,12 @@
     <summary{{ summary_attributes }}>{{ title }}</summary>
   {%- endif -%}
 
+  {% if errors %}
+    <div>
+      {{ errors }}
+    </div>
+  {% endif %}
+
   {{ description }}
   {{ children }}
   {{ value }}
diff --git a/core/themes/classy/templates/form/details.html.twig b/core/themes/classy/templates/form/details.html.twig
index 9b149d7..46d8dd0 100644
--- a/core/themes/classy/templates/form/details.html.twig
+++ b/core/themes/classy/templates/form/details.html.twig
@@ -5,6 +5,7 @@
  *
  * Available variables
  * - attributes: A list of HTML attributes for the details element.
+ * - errors: (optional) Any errors for this details element, may not be set.
  * - title: (optional) The title of the element, may not be set.
  * - description: (optional) The description of the element, may not be set.
  * - children: (optional) The children of the element, may not be set.
@@ -18,6 +19,11 @@
     <summary{{ summary_attributes }}>{{ title }}</summary>
   {%- endif -%}
   <div class="details-wrapper">
+    {% if errors %}
+      <div class="form-error-message">
+        <strong>{{ errors }}</strong>
+      </div>
+    {% endif %}
     {%- if description -%}
       <div class="details-description">{{ description }}</div>
     {%- endif -%}