Index: src/wp-includes/js/media-grid.js
===================================================================
--- src/wp-includes/js/media-grid.js	(revision 29362)
+++ src/wp-includes/js/media-grid.js	(working copy)
@@ -144,7 +144,7 @@
 					title:              options.title,
 					content:            'browse',
 					contentUserSetting: false,
-					filterable:         'mime-types'
+					filterable:         'all'
 				})
 			]);
 		},
Index: src/wp-includes/js/media-views.js
===================================================================
--- src/wp-includes/js/media-views.js	(revision 29362)
+++ src/wp-includes/js/media-views.js	(working copy)
@@ -5653,15 +5653,28 @@
 				priority: 10
 			};
 
-			filters.uploaded = {
-				text:  l10n.uploadedToThisPost,
+			if ( media.view.settings.post.id ) {
+				filters.uploaded = {
+					text:  l10n.uploadedToThisPost,
+					props: {
+						type:    null,
+						uploadedTo: media.view.settings.post.id,
+						orderby: 'menuOrder',
+						order:   'ASC'
+					},
+					priority: 20
+				};
+			}
+
+			filters.unattached = {
+				text:  l10n.unattached,
 				props: {
-					type:    null,
-					uploadedTo: media.view.settings.post.id,
-					orderby: 'menuOrder',
-					order:   'ASC'
+					uploadedTo: 0,
+					type:       null,
+					orderby:    'menuOrder',
+					order:      'ASC'
 				},
-				priority: 20
+				priority: 50
 			};
 
 			this.filters = filters;
Index: src/wp-includes/media.php
===================================================================
--- src/wp-includes/media.php	(revision 29362)
+++ src/wp-includes/media.php	(working copy)
@@ -2923,6 +2923,7 @@
 		'allDates'               => __( 'All dates' ),
 		'noItemsFound'           => __( 'No items found.' ),
 		'insertIntoPost'         => $hier ? __( 'Insert into page' ) : __( 'Insert into post' ),
+		'unattached'             => __( 'Unattached' ),
 		'uploadedToThisPost'     => $hier ? __( 'Uploaded to this page' ) : __( 'Uploaded to this post' ),
 		'warnDelete'             => __( "You are about to permanently delete this item.\n  'Cancel' to stop, 'OK' to delete." ),
 		'warnBulkDelete'         => __( "You are about to permanently delete these items.\n  'Cancel' to stop, 'OK' to delete." ),