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Fair Values of Assets and Liabilities - Changes in Level 3 Assets (Details) - Ameriprise Financial - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Available-for-Sale securities        
Summary of changes in Level 3 assets measured at fair value on a recurring basis        
Balance, beginning $ 531 $ 445 $ 470 $ 411
Total gains (losses) included in Net income 0 0 0 0
Total gains (losses) included in Other comprehensive income (loss) 0 (7) (3) 1
Purchases 133 23 210 78
Settlements (14) (12) (27) (41)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (25)   (25)  
Balance, ending 625 449 625 449
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period   (7) (3) 1
Corporate debt securities        
Summary of changes in Level 3 assets measured at fair value on a recurring basis        
Balance, beginning 505 440 469 405
Total gains (losses) included in Net income 0 0 0 0
Total gains (losses) included in Other comprehensive income (loss) 1 (7) (2) 1
Purchases 50 23 102 78
Settlements (12) (10) (25) (38)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0   0  
Balance, ending 544 446 544 446
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period   (7) (3) 1
Residential mortgage backed securities        
Summary of changes in Level 3 assets measured at fair value on a recurring basis        
Balance, beginning 25   0  
Total gains (losses) included in Net income 0   0  
Total gains (losses) included in Other comprehensive income (loss) (1)   (1)  
Purchases 60   85  
Settlements (2)   (2)  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 (25)   (25)  
Balance, ending 57   57  
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period     0  
Asset backed securities        
Summary of changes in Level 3 assets measured at fair value on a recurring basis        
Balance, beginning 1 5 1 6
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 23 0 23 0
Settlements 0 (2) 0 (3)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0   0  
Balance, ending 24 3 24 3
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period   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 54 48 51 48
Total gains (losses) included in Net income 2 2 6 2
Total gains (losses) included in Other comprehensive income (loss) 0 0 0 0
Purchases 0 0 0 0
Settlements (1) (1) (2) (1)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 0   0  
Balance, ending $ 55 49 55 49
Changes in unrealized gains (losses) in other comprehensive income (loss) relating to assets held at end of period   $ 0 $ 0 $ 0