Investments - Net Realized Gains and Losses on Available-for-Sale Securities (Details) - Ameriprise Financial - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments
Gross realized investment gains	$ 0	$ 2	$ 10	$ 24
Gross realized investment losses	(46)	(6)	(58)	(17)
Credit reversals (losses)	8	(21)	21	(21)
Other impairments	0	(61)	(2)	(67)
Total	$ (38)	$ (86)	$ (29)	$ (81)