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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Investments
Gross realized investment gains	$ 31	$ 0	$ 35	$ 10
Gross realized investment losses	(33)	(46)	(36)	(58)
Credit reversals (losses)	0	8	(3)	21
Other impairments	0	0	0	(2)
Total	(2)	(38)	(4)	(29)
Realized gains or losses on Available-for-Sale securities (less than)	$ (2)	$ (38)	$ (4)	$ (29)

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