Fair Values of Assets and Liabilities (Level 3 rollforwards-Assets) (Details 2) - Ameriprise Financial [Member] - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Corporate debt securities [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		$ 744	$ 809	$ 750	$ 913
Total gains (losses) included in net income			(1)	(1)	(1)
Total gains (losses) included in other comprehensive income (loss)		5	4	13	32
Purchases		7	21	12	35
Settlements		(14)	(39)	(32)	(185)
Balance, at the end of the period		742	794	742	794
Changes in unrealized gains (losses) relating to assets held at end of period				(1)	(1)
Changes in unrealized gains (losses) OCI relating to assets held at end of period		5		13
Residential mortgage backed securities [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		205	448	17	136
Total gains (losses) included in other comprehensive income (loss)				1
Purchases		33	60	220	477
Settlements			(6)		(12)
Transfers out of Level 3		(188)	(348)	(188)	(447)
Balance, at the end of the period		50	154	50	154
Changes in unrealized gains (losses) OCI relating to assets held at end of period				1
Commercial mortgage backed securities [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period					20
Transfers out of Level 3					(20)
Balance, at the end of the period			0		0
Asset backed securities [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		15	24	19	6
Total gains (losses) included in net income				(1)
Total gains (losses) included in other comprehensive income (loss)		1		(1)
Purchases					18
Settlements		1
Transfers into Level 3		13	14	13	14
Transfers out of Level 3			(18)		(18)
Balance, at the end of the period		30	20	30	20
Changes in unrealized gains (losses) relating to assets held at end of period				(1)
Changes in unrealized gains (losses) OCI relating to assets held at end of period		1		(1)
Available-for-sale securities [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period		964	1,281	786	1,075
Total gains (losses) included in net income	[1]		(1)	(2)	(1)
Total gains (losses) included in other comprehensive income (loss)		6	4	13	32
Purchases		40	81	232	530
Settlements		(13)	(45)	(32)	(197)
Transfers into Level 3		13	14	13	14
Transfers out of Level 3		(188)	(366)	(188)	(485)
Balance, at the end of the period		822	$ 968	822	968
Changes in unrealized gains (losses) relating to assets held at end of period	[1]			(2)	$ (1)
Changes in unrealized gains (losses) OCI relating to assets held at end of period		$ 6		$ 13

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