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, 2019	Sep. 30, 2018	Sep. 30, 2019		Sep. 30, 2018
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		$ 809	$ 1,040	$ 913		$ 1,139
Total gains (losses) included in net income		(1)		(1)		(1)
Total gains (losses) included in other comprehensive income (loss)		4	(2)	32		(28)
Purchases		21		35		15
Settlements		(39)	(46)	(185)		(133)
Balance, at the end of the period		794	992	794		992
Changes in unrealized gains (losses) relating to assets held at end of period				(1)		(1)
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		448	120	136		155
Total gains (losses) included in other comprehensive income (loss)						1
Purchases		60	20	477		20
Settlements		(6)	(5)	(12)		(24)
Transfers out of Level 3		(348)	(26)	(447)		(43)
Balance, at the end of the period		154	109	154		109
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			52	20		0
Purchases						52
Transfers out of Level 3			(52)	(20)		(52)
Balance, at the end of the period		0	0	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		24	31	6		7
Total gains (losses) included in other comprehensive income (loss)			1			1
Purchases				18		32
Settlements			(1)			(1)
Transfers into Level 3		14		14		2
Transfers out of Level 3		(18)	(22)	(18)		(32)
Balance, at the end of the period		20	9	20		9
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		1,281	1,243	1,075		1,301
Total gains (losses) included in net income	[1]	(1)		(1)		(1)
Total gains (losses) included in other comprehensive income (loss)		4	(1)	32		(26)
Purchases		81	20	530		119
Settlements		(45)	(52)	(197)		(158)
Transfers into Level 3		14		14		2
Transfers out of Level 3		(366)	(100)	(485)		(127)
Balance, at the end of the period		968	1,110	968		1,110
Changes in unrealized gains (losses) relating to assets held at end of period		$ 0	0	$ (1)	[1]	(1)	[1]
Other contracts [Member]
Summary of changes in Level 3 assets measured at fair value on a recurring basis [Rollforward]
Balance, at the beginning of the period			2			0
Total gains (losses) included in net income	[2]		(2)			(3)
Purchases						3
Balance, at the end of the period			0			0
Changes in unrealized gains (losses) relating to assets held at end of period	[2]		$ (2)			$ (3)

[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