diff --git a/packages/block-library/src/details/edit.js b/packages/block-library/src/details/edit.js
index 693e0fb310add0..1205b8fa099c9c 100644
--- a/packages/block-library/src/details/edit.js
+++ b/packages/block-library/src/details/edit.js
@@ -6,20 +6,26 @@ import {
 	useBlockProps,
 	useInnerBlocksProps,
 	InspectorControls,
+	store as blockEditorStore,
 } from '@wordpress/block-editor';
 import {
 	TextControl,
 	ToggleControl,
 	__experimentalToolsPanel as ToolsPanel,
 	__experimentalToolsPanelItem as ToolsPanelItem,
+	privateApis as componentsPrivateApis,
 } from '@wordpress/components';
 import { __ } from '@wordpress/i18n';
 import { useState } from '@wordpress/element';
+import { useSelect } from '@wordpress/data';
 
 /**
  * Internal dependencies
  */
 import { useToolsPanelDropdownMenuProps } from '../utils/hooks';
+import { unlock } from '../lock-unlock';
+
+const { withIgnoreIMEEvents } = unlock( componentsPrivateApis );
 
 const TEMPLATE = [
 	[
@@ -30,7 +36,7 @@ const TEMPLATE = [
 	],
 ];
 
-function DetailsEdit( { attributes, setAttributes } ) {
+function DetailsEdit( { attributes, setAttributes, clientId } ) {
 	const { name, showContent, summary, allowedBlocks, placeholder } =
 		attributes;
 	const blockProps = useBlockProps();
@@ -42,6 +48,27 @@ function DetailsEdit( { attributes, setAttributes } ) {
 	const [ isOpen, setIsOpen ] = useState( showContent );
 	const dropdownMenuProps = useToolsPanelDropdownMenuProps();
 
+	// Check if the inner blocks are selected.
+	const hasSelectedInnerBlock = useSelect(
+		( select ) =>
+			select( blockEditorStore ).hasSelectedInnerBlock( clientId, true ),
+		[ clientId ]
+	);
+
+	const handleSummaryKeyDown = ( event ) => {
+		if ( event.key === 'Enter' && ! event.shiftKey ) {
+			setIsOpen( ( prevIsOpen ) => ! prevIsOpen );
+			event.preventDefault();
+		}
+	};
+
+	// Prevent spacebar from toggling <details> while typing.
+	const handleSummaryKeyUp = ( event ) => {
+		if ( event.key === ' ' ) {
+			event.preventDefault();
+		}
+	};
+
 	return (
 		<>
 			<InspectorControls>
@@ -93,13 +120,18 @@ function DetailsEdit( { attributes, setAttributes } ) {
 			</InspectorControls>
 			<details
 				{ ...innerBlocksProps }
-				open={ isOpen }
+				open={ isOpen || hasSelectedInnerBlock }
 				onToggle={ ( event ) => setIsOpen( event.target.open ) }
 			>
-				<summary>
+				<summary
+					onKeyDown={ withIgnoreIMEEvents( handleSummaryKeyDown ) }
+					onKeyUp={ handleSummaryKeyUp }
+				>
 					<RichText
 						identifier="summary"
-						aria-label={ __( 'Write summary' ) }
+						aria-label={ __(
+							'Write summary. Press Enter to expand or collapse the details.'
+						) }
 						placeholder={ placeholder || __( 'Write summary…' ) }
 						withoutInteractiveFormatting
 						value={ summary }
diff --git a/packages/components/CHANGELOG.md b/packages/components/CHANGELOG.md
index cf665a116f6b33..4e9ddc5a729127 100644
--- a/packages/components/CHANGELOG.md
+++ b/packages/components/CHANGELOG.md
@@ -15,6 +15,7 @@
 ### Internal
 
 -   Expose `normalizeTextString` method as private API ([#70178](https://github.com/WordPress/gutenberg/pull/70178)).
+-   Mark `withIgnoreIMEEvents()` function as private API ([#70056](https://github.com/WordPress/gutenberg/pull/70056)).
 
 ## 29.10.0 (2025-05-22)
 
diff --git a/packages/components/src/private-apis.ts b/packages/components/src/private-apis.ts
index b2f800f9200b0a..fa618e21ed2938 100644
--- a/packages/components/src/private-apis.ts
+++ b/packages/components/src/private-apis.ts
@@ -7,6 +7,7 @@ import { ComponentsContext } from './context/context-system-provider';
 import Theme from './theme';
 import { Tabs } from './tabs';
 import { kebabCase, normalizeTextString } from './utils/strings';
+import { withIgnoreIMEEvents } from './utils/with-ignore-ime-events';
 import { lock } from './lock-unlock';
 import Badge from './badge';
 
@@ -18,6 +19,7 @@ lock( privateApis, {
 	Theme,
 	Menu,
 	kebabCase,
+	withIgnoreIMEEvents,
 	Badge,
 	normalizeTextString,
 } );
diff --git a/test/e2e/specs/editor/blocks/details.spec.js b/test/e2e/specs/editor/blocks/details.spec.js
new file mode 100644
index 00000000000000..2b7e954b6eeaad
--- /dev/null
+++ b/test/e2e/specs/editor/blocks/details.spec.js
@@ -0,0 +1,143 @@
+/**
+ * WordPress dependencies
+ */
+const { test, expect } = require( '@wordpress/e2e-test-utils-playwright' );
+
+test.describe( 'Details', () => {
+	test.beforeEach( async ( { admin } ) => {
+		await admin.createNewPost();
+	} );
+
+	test( 'can toggle hidden blocks by pressing enter', async ( {
+		editor,
+		page,
+	} ) => {
+		// Insert a details block with empty inner blocks.
+		await editor.insertBlock( {
+			name: 'core/details',
+			attributes: {
+				summary: 'Details summary',
+			},
+			innerBlocks: [
+				{
+					name: 'core/paragraph',
+					attributes: {
+						content: 'Details content',
+					},
+				},
+			],
+		} );
+
+		// Open the details block.
+		await page.keyboard.press( 'Enter' );
+
+		// The inner block should be visible.
+		await expect(
+			editor.canvas.getByRole( 'document', { name: 'Block: Paragraph' } )
+		).toContainText( 'Details content' );
+
+		// Close the details block.
+		await page.keyboard.press( 'Enter' );
+
+		// The inner block should be hidden.
+		await expect(
+			editor.canvas.getByRole( 'document', { name: 'Block: Paragraph' } )
+		).toBeHidden();
+	} );
+
+	test( 'can create a multiline summary with Shift+Enter', async ( {
+		editor,
+		page,
+	} ) => {
+		// Insert a details block.
+		await editor.insertBlock( {
+			name: 'core/details',
+		} );
+
+		const summary = editor.canvas.getByRole( 'textbox', {
+			name: 'Write summary',
+		} );
+
+		// Add a multiline summary.
+		await summary.type( 'First line' );
+		await page.keyboard.press( 'Shift+Enter' );
+		await summary.type( 'Second line' );
+
+		// Verify the summary is multiline.
+		await expect( summary ).toHaveText( 'First line\nSecond line', {
+			useInnerText: true,
+		} );
+	} );
+
+	test( 'typing space in summary rich-text should not toggle details', async ( {
+		editor,
+	} ) => {
+		// Insert a details block.
+		await editor.insertBlock( {
+			name: 'core/details',
+		} );
+
+		const summary = editor.canvas.getByRole( 'textbox', {
+			name: 'Write summary',
+		} );
+
+		// Type space in the summary rich-text.
+		await summary.type( ' ' );
+
+		// Verify the details block is not toggled.
+		await expect(
+			editor.canvas.getByRole( 'document', { name: 'Empty block' } )
+		).toBeHidden();
+	} );
+
+	test( 'selecting hidden blocks in list view expands details and focuses content', async ( {
+		editor,
+		page,
+		pageUtils,
+	} ) => {
+		// Insert a details block.
+		await editor.insertBlock( {
+			name: 'core/details',
+			attributes: {
+				summary: 'Details summary',
+			},
+			innerBlocks: [
+				{
+					name: 'core/paragraph',
+					attributes: {
+						content: 'Details content',
+					},
+				},
+			],
+		} );
+
+		const listView = page.getByRole( 'treegrid', {
+			name: 'Block navigation structure',
+		} );
+
+		// Open the list view.
+		await pageUtils.pressKeys( 'access+o' );
+
+		// Verify inner blocks appear in the list view.
+		await page.keyboard.press( 'ArrowRight' );
+		await expect(
+			listView.getByRole( 'link', {
+				name: 'Paragraph',
+			} )
+		).toBeVisible();
+
+		// Verify the first inner block in the list view is focused.
+		await page.keyboard.press( 'ArrowDown' );
+		await expect(
+			listView.getByRole( 'link', {
+				name: 'Paragraph',
+			} )
+		).toBeFocused();
+
+		// Verify the first inner block in the editor canvas is focused.
+		await page.keyboard.press( 'Enter' );
+		await expect(
+			editor.canvas.getByRole( 'document', { name: 'Block: Paragraph' } )
+		).toBeFocused();
+	} );
+} );