Deferred Acquisition Costs and Deferred Sales Inducement Costs (Details) - Ameriprise Financial [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balances of and changes in DAC
Balance at the beginning of the period	$ 2,698	$ 2,776	$ 2,676
Capitalization of acquisition costs	228	291	318
Amortization, excluding the impact of valuation assumptions review	(177)	(165)	(355)
Amortization, impact of valuation assumptions review	(100)	(14)	33
Impact of change in net unrealized (gains) losses on securities	(117)	(175)	104
Disposal of business	0	15	0
Balance at the end of the period	2,532	2,698	2,776
Balances of and changes in DSIC
Balance at the beginning of the period	218	251	276
Capitalization of sales inducement costs	1	1	2
Amortization, excluding the impact of valuation assumptions review	(13)	(15)	(43)
Amortization, impact of valuation assumptions review	(16)	0	0
Impact of change in net unrealized (gains) losses on securities	(1)	(19)	16
Balance at the end of the period	$ 189	$ 218	$ 251