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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net realized gains and losses on Available-for-Sale securities |  |  |
Gross realized investment gains | $ 41 | $ 11 | $ 28
Gross realized investment losses | (57) | (58) | (22)
Credit reversals (losses) | (3) | 20 | (21)
Other impairments | 0 | (2) | (70)
Total | $ (19) | $ (29) | $ (85)

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 + Details
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