Basis of Presentation - Reinsurance Transaction (Details) - Subsidiaries - RiverSource Life Insurance Company - USD ($) $ in Millions		3 Months Ended
Jul. 01, 2021	Sep. 30, 2021
Reinsurance transaction
Consideration transferred in reinsurance transaction		$ 7,800
Net realized gain		$ 532
Fixed deferred and immediate annuity policies
Reinsurance transaction
Policies reinsured	$ 7,000

Amount of written premiums ceded to other entities.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Name:	us-gaap_CededPremiumsWritten
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration