Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Level 3 rollforwards-Assets) (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Corporate debt securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, at the beginning of the period		$ 750	$ 913	$ 1,139
Total gains (losses) included in net income		(1)	(1)	(1)
Total gains (losses) included in other comprehensive income (loss)		15	31	(26)
Purchases		62	55	15
Settlements		(54)	(248)	(214)
Balance, at the end of the period		772	750	913
Changes in unrealized gains (losses) included in income relating to assets held at end of period		(1)	(1)	(1)
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period		16
Residential mortgage backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, at the beginning of the period		17	136	155
Total gains (losses) included in other comprehensive income (loss)		1		1
Purchases		220	477	70
Settlements			(12)	(29)
Transfers out of Level 3		(229)	(584)	(61)
Balance, at the end of the period		9	17	136
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period		1
Commercial mortgage backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, at the beginning of the period		0	20	0
Purchases				72
Transfers out of Level 3			(20)	(52)
Balance, at the end of the period			0	20
Asset backed securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, at the beginning of the period		19	6	7
Total gains (losses) included in other comprehensive income (loss)		(1)	(1)	1
Purchases			18	32
Settlements				(1)
Transfers into Level 3		14	14	2
Transfers out of Level 3			(18)	(35)
Balance, at the end of the period		32	19	6
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		(1)
Total available-for-sale securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, at the beginning of the period		786	1,075	1,301
Total gains (losses) included in net income	[1]	(1)	(1)	(1)
Total gains (losses) included in other comprehensive income (loss)		15	30	(24)
Purchases		282	550	189
Settlements		(54)	(260)	(244)
Transfers into Level 3		14	14	2
Transfers out of Level 3		(229)	(622)	(148)
Balance, at the end of the period		813	786	1,075
Changes in unrealized gains (losses) included in income relating to assets held at end of period	[1]	(2)	(1)	(1)
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period		$ 16
Other derivative contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, at the beginning of the period			$ 0	0
Total gains (losses) included in net income	[2]			(3)
Purchases				3
Balance, at the end of the period				$ 0

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

[2] Included in benefits, claims, losses and settlement expenses in the Consolidated Statements of Operations.