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Investments - Available-for Sale Securities in Continuous Unrealized Loss Position (Details) - Ameriprise Financial
$ in Millions
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Number of securities    
Less than 12 months | security 105 275
12 months or more | security 1,323 1,556
Total | security 1,428 1,831
Fair Value    
Less than 12 months $ 1,591 $ 6,944
12 months or more 18,693 22,956
Total 20,284 29,900
Unrealized Losses    
Less than 12 months (14) (48)
12 months or more (1,430) (2,051)
Total $ (1,444) $ (2,099)
Available-for-Sale Securities with gross unrealized losses considered investment grade (as a percent) 96.00% 96.00%
Corporate debt securities    
Number of securities    
Less than 12 months | security 67 97
12 months or more | security 314 376
Total | security 381 473
Fair Value    
Less than 12 months $ 678 $ 1,276
12 months or more 4,666 5,197
Total 5,344 6,473
Unrealized Losses    
Less than 12 months (9) (11)
12 months or more (387) (496)
Total $ (396) $ (507)
Residential mortgage backed securities    
Number of securities    
Less than 12 months | security 19 82
12 months or more | security 676 734
Total | security 695 816
Fair Value    
Less than 12 months $ 597 $ 3,052
12 months or more 9,955 10,677
Total 10,552 13,729
Unrealized Losses    
Less than 12 months (3) (25)
12 months or more (807) (1,146)
Total $ (810) $ (1,171)
Commercial mortgage backed securities    
Number of securities    
Less than 12 months | security 8 31
12 months or more | security 243 277
Total | security 251 308
Fair Value    
Less than 12 months $ 196 $ 747
12 months or more 3,507 4,092
Total 3,703 4,839
Unrealized Losses    
Less than 12 months (1) (9)
12 months or more (191) (332)
Total $ (192) $ (341)
Asset backed securities    
Number of securities    
Less than 12 months | security 5 49
12 months or more | security 41 116
Total | security 46 165
Fair Value    
Less than 12 months $ 56 $ 885
12 months or more 415 2,840
Total 471 3,725
Unrealized Losses    
Less than 12 months 0 (2)
12 months or more (32) (57)
Total $ (32) $ (59)
State and municipal obligations    
Number of securities    
Less than 12 months | security 5 5
12 months or more | security 46 49
Total | security 51 54
Fair Value    
Less than 12 months $ 6 $ 29
12 months or more 137 138
Total 143 167
Unrealized Losses    
Less than 12 months (1) (1)
12 months or more (13) (19)
Total $ (14) $ (20)
U.S. government and agency obligations    
Number of securities    
Less than 12 months | security 1 11
12 months or more | security 0 1
Total | security 1 12
Fair Value    
Less than 12 months $ 58 $ 955
12 months or more 0 0
Total 58 955
Unrealized Losses    
Less than 12 months 0 0
12 months or more 0 0
Total $ 0 $ 0
Foreign government bonds and obligations    
Number of securities    
Less than 12 months | security 0 0
12 months or more | security 3 3
Total | security 3 3
Fair Value    
Less than 12 months $ 0 $ 0
12 months or more 13 12
Total 13 12
Unrealized Losses    
Less than 12 months 0 0
12 months or more 0 (1)
Total $ 0 $ (1)