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Investments - Net Realized Gains and Losses on Available-for-Sale Securities (Details) - Ameriprise Financial - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Net realized gains and losses on Available-for-Sale securities |  |  |
Gross realized investment gains | $ 11 | $ 28 | $ 582
Gross realized investment losses | (58) | (22) | (7)
Credit reversals (losses) | 20 | (21) | (1)
Other impairments | (2) | (70) | (13)
Total | $ (29) | $ (85) | $ 561

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