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Fair Values of Assets and Liabilities - Changes in Level 3 Assets (Details) - Ameriprise Financial - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Available-for-Sale securities        
Summary of changes in Level 3 assets measured at fair value on a recurring basis        
Balance, beginning $ 811 $ 625 $ 747 $ 470
Total gains (losses) included in Net income 1 1 2 1
Total gains (losses) included in Other comprehensive income (loss) 4 17 18 14
Purchases 32 72 188 282
Settlements (26) (28) (95) (55)
Transfers out of Level 3 (23) (81) (61) (106)
Balance, ending 799 606 799 606
Changes in unrealized gains (losses) included in net income relating to assets held at end of period 1   2 1
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period 4 16 18 13
Corporate debt securities        
Summary of changes in Level 3 assets measured at fair value on a recurring basis        
Balance, beginning 708 544 583 469
Total gains (losses) included in Net income 1 1 2 1
Total gains (losses) included in Other comprehensive income (loss) 4 16 18 14
Purchases 32 44 163 146
Settlements (14) (28) (35) (53)
Transfers out of Level 3 0 0 0 0
Balance, ending 731 577 731 577
Changes in unrealized gains (losses) included in net income relating to assets held at end of period 1   2 1
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period 4 16 18 13
Residential mortgage backed securities        
Summary of changes in Level 3 assets measured at fair value on a recurring basis        
Balance, beginning 23 57 38 0
Total gains (losses) included in Net income 0 0 0 0
Total gains (losses) included in Other comprehensive income (loss) 0 1 0 0
Purchases 0 27 25 112
Settlements 0 0 (2) (2)
Transfers out of Level 3 (23) (57) (61) (82)
Balance, ending 0 28 0 28
Changes in unrealized gains (losses) included in net income relating to assets held at end of period 0   0 0
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period 0 0 0 0
Asset backed securities        
Summary of changes in Level 3 assets measured at fair value on a recurring basis        
Balance, beginning 80 24 126 1
Total gains (losses) included in Net income 0 0 0 0
Total gains (losses) included in Other comprehensive income (loss) 0 0 0 0
Purchases 0 1 0 24
Settlements (12) 0 (58) 0
Transfers out of Level 3 0 (24) 0 (24)
Balance, ending 68 1 68 1
Changes in unrealized gains (losses) included in net income relating to assets held at end of period 0   0 0
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period 0 0 0 0
Fixed deferred indexed annuities ceded embedded derivatives        
Summary of changes in Level 3 assets measured at fair value on a recurring basis        
Balance, beginning 57 55 55 51
Total gains (losses) included in Net income 3 1 8 7
Total gains (losses) included in Other comprehensive income (loss) 0 0 0 0
Purchases 0 0 0 0
Settlements (1) (1) (4) (3)
Transfers out of Level 3 0 0 0 0
Balance, ending 59 55 59 55
Changes in unrealized gains (losses) included in net income relating to assets held at end of period 0   0 0
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period $ 0 $ 0 $ 0 $ 0