diff --git a/keystone/common/policies/trust.py b/keystone/common/policies/trust.py
index bcd681f9c2..96fb698e58 100644
--- a/keystone/common/policies/trust.py
+++ b/keystone/common/policies/trust.py
@@ -22,6 +22,7 @@ SYSTEM_READER_OR_TRUSTOR_OR_TRUSTEE = (
 )
 SYSTEM_READER_OR_TRUSTOR = base.SYSTEM_READER + ' or ' + RULE_TRUSTOR
 SYSTEM_READER_OR_TRUSTEE = base.SYSTEM_READER + ' or ' + RULE_TRUSTEE
+SYSTEM_ADMIN_OR_TRUSTOR = base.SYSTEM_ADMIN + ' or ' + RULE_TRUSTOR
 
 deprecated_list_trusts = policy.DeprecatedRule(
     name=base.IDENTITY % 'list_trusts',
@@ -35,6 +36,10 @@ deprecated_get_role_for_trust = policy.DeprecatedRule(
     name=base.IDENTITY % 'get_role_for_trust',
     check_str=RULE_TRUSTOR + ' or ' + RULE_TRUSTEE
 )
+deprecated_delete_trust = policy.DeprecatedRule(
+    name=base.IDENTITY % 'delete_trust',
+    check_str=RULE_TRUSTOR
+)
 deprecated_get_trust = policy.DeprecatedRule(
     name=base.IDENTITY % 'get_trust',
     check_str=RULE_TRUSTOR + ' or ' + RULE_TRUSTEE
@@ -115,11 +120,14 @@ trust_policies = [
         deprecated_since=versionutils.deprecated.TRAIN),
     policy.DocumentedRuleDefault(
         name=base.IDENTITY % 'delete_trust',
-        check_str=RULE_TRUSTOR,
-        scope_types=['project'],
+        check_str=SYSTEM_ADMIN_OR_TRUSTOR,
+        scope_types=['system', 'project'],
         description='Revoke trust.',
         operations=[{'path': '/v3/OS-TRUST/trusts/{trust_id}',
-                     'method': 'DELETE'}]),
+                     'method': 'DELETE'}],
+        deprecated_rule=deprecated_delete_trust,
+        deprecated_reason=DEPRECATED_REASON,
+        deprecated_since=versionutils.deprecated.TRAIN),
     policy.DocumentedRuleDefault(
         name=base.IDENTITY % 'get_trust',
         check_str=SYSTEM_READER_OR_TRUSTOR_OR_TRUSTEE,
diff --git a/keystone/tests/unit/protection/v3/test_trusts.py b/keystone/tests/unit/protection/v3/test_trusts.py
index 2a3a8da266..0cb3b06c54 100644
--- a/keystone/tests/unit/protection/v3/test_trusts.py
+++ b/keystone/tests/unit/protection/v3/test_trusts.py
@@ -378,9 +378,7 @@ class SystemAdminTests(TrustTests, _AdminTestsMixin, _SystemUserTests):
 
     def setUp(self):
         super(SystemAdminTests, self).setUp()
-        # TODO(cmurphy) enable enforce_scope when trust policies become
-        # system-scope aware
-        # self.config_fixture.config(group='oslo_policy', enforce_scope=True)
+        self.config_fixture.config(group='oslo_policy', enforce_scope=True)
 
         self.user_id = self.bootstrapper.admin_user_id
         auth = self.build_authentication_request(
@@ -396,16 +394,14 @@ class SystemAdminTests(TrustTests, _AdminTestsMixin, _SystemUserTests):
             self.token_id = r.headers['X-Subject-Token']
             self.headers = {'X-Auth-Token': self.token_id}
 
-    def test_admin_cannot_delete_trust_for_other_user(self):
-        # only the is_admin admin can do this
+    def test_admin_can_delete_trust_for_other_user(self):
         ref = PROVIDERS.trust_api.create_trust(
             self.trust_id, **self.trust_data)
 
         with self.test_client() as c:
             c.delete(
                 '/v3/OS-TRUST/trusts/%s' % ref['id'],
-                headers=self.headers,
-                expected_status_code=http_client.FORBIDDEN
+                headers=self.headers
             )
 
     def test_admin_cannot_delete_trust_for_user_overridden_defaults(self):
diff --git a/releasenotes/notes/bug-1818846-d1a8c77d20659ad6.yaml b/releasenotes/notes/bug-1818846-d1a8c77d20659ad6.yaml
new file mode 100644
index 0000000000..f397dd44a6
--- /dev/null
+++ b/releasenotes/notes/bug-1818846-d1a8c77d20659ad6.yaml
@@ -0,0 +1,41 @@
+---
+features:
+  - |
+    [`bug 1818846 <https://bugs.launchpad.net/keystone/+bug/1818846>`_]
+    The trusts API now supports the ``admin``, ``member``, and ``reader``
+    default roles. System users can now audit and clean up trusts using the
+    default policies.
+upgrade:
+  - |
+    [`bug 1818846 <https://bugs.launchpad.net/keystone/+bug/1818846>`_]
+    [`bug 1818850 <https://bugs.launchpad.net/keystone/+bug/1818850>`_]
+    The trusts API uses new default policies that make it more
+    accessible to end users and administrators in a secure way. Please
+    consider these new defaults if your deployment overrides
+    trust policies.
+deprecations:
+  - |
+    [`bug 1818846 <https://bugs.launchpad.net/keystone/+bug/1818846>`_]
+    [`bug 1818850 <https://bugs.launchpad.net/keystone/+bug/1818850>`_]
+    The trust policies have been deprecated. The ``identity:list_trusts``
+    policy now uses ``(role:reader and system_scope:all)`` instead of
+    ``rule_admin_required``. The ``identity:list_roles_for_trust``,
+    ``identity:get_role_for_trust``, and ``identity:get_trust`` policies now
+    use ``(role:reader and system_scope:all) or
+    user_id:%(target.trust.trustor_user_id)s or
+    user_id:%(target.trust.trustee_user_id)s`` instead
+    of``user_id:%(target.trust.trustor_user_id)s or
+    user_id:%(target.trust.trustee_user_id)s``. The ``identity:delete_trust``
+    policy now uses ``(role:admin and system_scope:all) or
+    user_id:%(target.trust.trustor_user_id)s`` instead of
+    ``user_id:%(target.trust.trustor_user_id)s``. These new defaults
+    automatically account for system-scope and support a read-only role, making
+    it easier for system administrators to delegate subsets of responsibility
+    without compromising security. Please consider these new defaults if your
+    deployment overrides trust policies.
+security:
+  - |
+    [`bug 1818846 <https://bugs.launchpad.net/keystone/+bug/1818846>`_]
+    [`bug 1818850 <https://bugs.launchpad.net/keystone/+bug/1818850>`_]
+    The trusts API now uses system-scope and default roles to
+    provide better accessibility to users in a secure way.