Investments - Rollforward of Allowance for Credit Losses (Details) - Ameriprise Financial - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Rollforward of Available-for-Sale securities allowance for credit losses
Beginning Balance	$ 9	$ 1	$ 22	$ 1
Reductions for securities sold during the period (realized)	(8)		(21)
Additions for which credit losses were not previously recorded		20		20
Additional increases (decreases) on securities that had an allowance recorded in a previous period		1		1
Ending Balance	1	22	1	22
Corporate debt securities
Rollforward of Available-for-Sale securities allowance for credit losses
Beginning Balance	7	0	20	0
Reductions for securities sold during the period (realized)	(7)		(20)
Additions for which credit losses were not previously recorded		20		20
Additional increases (decreases) on securities that had an allowance recorded in a previous period		0		0
Ending Balance	0	20	0	20
State and municipal obligations
Rollforward of Available-for-Sale securities allowance for credit losses
Beginning Balance	2	1	2	1
Reductions for securities sold during the period (realized)	(1)		(1)
Additions for which credit losses were not previously recorded		0		0
Additional increases (decreases) on securities that had an allowance recorded in a previous period		1		1
Ending Balance	$ 1	$ 2	$ 1	$ 2