Investments - Net Realized Gains and Losses on Available-for-Sale Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Investments
Total	$ 1
Realized gains or losses on Available-for-Sale securities (less than)	1
Ameriprise Financial
Investments
Gross realized investment gains	0	$ 10
Gross realized investment losses	0	(2)
Credit reversals (losses)	0	(3)
Other impairments	0	(2)
Total	0	3
Realized gains or losses on Available-for-Sale securities (less than)	$ 0	$ 3