Fair Values of Assets and Liabilities (Level 3 rollforwards-Assets) (Details 2) - Ameriprise Financial [Member] - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 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		$ 734	$ 847	$ 750	$ 913
Total gains (losses) included in net income		(1)		(1)
Total gains (losses) included in other comprehensive income (loss)		14	13	8	28
Purchases			14	5	14
Settlements		(3)	(65)	(18)	(146)
Balance, at the end of the period		744	809	744	809
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		14		8
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		17	37	17	136
Total gains (losses) included in other comprehensive income (loss)		1		1
Purchases		187	417	187	417
Settlements			(2)		(6)
Transfers out of Level 3			(4)		(99)
Balance, at the end of the period		205	448	205	448
Changes in unrealized gains (losses) OCI relating to assets held at end of period		1		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		17	6	19	6
Total gains (losses) included in net income				(1)
Total gains (losses) included in other comprehensive income (loss)		(1)		(2)
Purchases			18		18
Settlements		(1)		(1)
Balance, at the end of the period		15	24	15	24
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)		(2)
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		768	890	786	1,075
Total gains (losses) included in net income	[1]	(1)		(2)
Total gains (losses) included in other comprehensive income (loss)		14	13	7	28
Purchases		187	449	192	449
Settlements		(4)	(67)	(19)	(152)
Transfers out of Level 3			(4)		(119)
Balance, at the end of the period		964	$ 1,281	964	$ 1,281
Changes in unrealized gains (losses) relating to assets held at end of period	[1]	(1)		(2)
Changes in unrealized gains (losses) OCI relating to assets held at end of period		$ 14		$ 7

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