Fair Values of Assets and Liabilities (Level 3 rollforwards-Assets) (Details 2) - Ameriprise Financial - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Corporate debt securities
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, at the beginning of the period		$ 812	$ 734	$ 772	$ 750
Total gains (losses) included in net income			(1)		(1)
Total gains (losses) included in other comprehensive income (loss)		2	14	(3)	8
Purchases		21		67	5
Settlements		(28)	(3)	(29)	(18)
Transfers out of Level 3		(416)		(416)
Balance, at the end of the period		391	744	391	744
Changes in unrealized gains (losses) in net income relating to assets held			(1)		(1)
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held		2	14		8
Residential mortgage backed securities
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, at the beginning of the period		87	17	9	17
Total gains (losses) included in other comprehensive income (loss)			1		1
Purchases			187	78	187
Transfers out of Level 3		(87)		(87)
Balance, at the end of the period		0	205	0	205
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held			1		1
Asset backed securities
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, at the beginning of the period		30	17	32	19
Total gains (losses) included in net income				(1)	(1)
Total gains (losses) included in other comprehensive income (loss)			(1)		(2)
Settlements			(1)	(1)	(1)
Transfers out of Level 3		(24)		(24)
Balance, at the end of the period		6	15	6	15
Changes in unrealized gains (losses) in net income relating to assets held				(1)	(1)
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held			(1)		(2)
Available-for-sale securities
Changes in Level 3 assets measured at fair value on a recurring basis
Balance, at the beginning of the period		929	768	813	786
Total gains (losses) included in net income	[1]		(1)	(1)	(2)
Total gains (losses) included in other comprehensive income (loss)		2	14	(3)	7
Purchases		21	187	145	192
Settlements		(28)	(4)	(30)	(19)
Transfers out of Level 3		(527)		(527)
Balance, at the end of the period		397	964	397	964
Changes in unrealized gains (losses) in net income relating to assets held	[1]		(1)	$ (1)	(2)
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held		$ 2	$ 14		$ 7

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