Fair Values of Assets and Liabilities - Changes in Level 3 Assets (Details) - Ameriprise Financial - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Available-for-Sale securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning		$ 397	$ 964	$ 813	$ 786
Total gains (losses) included in net income	[1]			(1)	(2)
Total gains (losses) included in other comprehensive income (loss)		(3)	6	(6)	13
Purchases		9	40	154	232
Sales		(1)		(1)
Settlements		(45)	(13)	(75)	(32)
Transfers into Level 3		170	13	170	13
Transfers out of Level 3			(188)	(527)	(188)
Balance, ending		527	822	527	822
Changes in unrealized gains (losses) included in income relating to assets held at end of period	[1]			(1)	(2)
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period		(4)	6	(4)	13
Corporate debt securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning		391	744	772	750
Total gains (losses) included in net income		(1)		(1)	(1)
Total gains (losses) included in other comprehensive income (loss)		(3)	5	(6)	13
Purchases		9	7	76	12
Settlements		(44)	(14)	(73)	(32)
Transfers into Level 3		168		168
Transfers out of Level 3				(416)
Balance, ending		520	742	520	742
Changes in unrealized gains (losses) included in income relating to assets held at end of period					(1)
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period		(4)	5	(4)	13
Residential mortgage backed securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning			205	9	17
Total gains (losses) included in other comprehensive income (loss)					1
Purchases			33	78	220
Transfers out of Level 3			(188)	(87)	(188)
Balance, ending		0	50	0	50
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period					1
Asset backed securities
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning		6	15	32	19
Total gains (losses) included in net income		1			(1)
Total gains (losses) included in other comprehensive income (loss)			1		(1)
Sales		(1)		(1)
Settlements		(1)	1	(2)
Transfers into Level 3		2	13	2	13
Transfers out of Level 3				(24)
Balance, ending		7	30	7	30
Changes in unrealized gains (losses) included in income relating to assets held at end of period				(1)	(1)
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period			$ 1		$ (1)
Fixed Deferred Indexed Annuity Ceded Embedded Derivatives
Summary of changes in Level 3 assets measured at fair value on a recurring basis
Balance, beginning		0		0
Issues	[2]	57		57
Settlements		(1)		(1)
Balance, ending		$ 56		$ 56

[1] Included in net investment income in the Consolidated Statements of Operations.

[2] Represents the amount of ceded embedded derivatives associated with fixed deferred annuity products reinsured in the third quarter of 2021. See Note 1 for additional information on the reinsurance transaction.