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Investments - Available-for Sale Securities in Continuous Unrealized Loss Position (Details) - Ameriprise Financial
$ in Millions
Sep. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Number of securities    
Less than 12 months | security 230 546
12 months or more | security 1,153 1,268
Total | security 1,383 1,814
Fair Value    
Less than 12 months $ 4,528 $ 13,000
12 months or more 15,135 16,991
Total 19,663 29,991
Unrealized Losses    
Less than 12 months (83) (284)
12 months or more (1,235) (1,837)
Total $ (1,318) $ (2,121)
Available-for-Sale Securities with gross unrealized losses considered investment grade (as a percent) 96.00% 97.00%
Corporate debt securities    
Number of securities    
Less than 12 months | security 124 282
12 months or more | security 276 291
Total | security 400 573
Fair Value    
Less than 12 months $ 1,869 $ 5,328
12 months or more 4,098 4,042
Total 5,967 9,370
Unrealized Losses    
Less than 12 months (72) (178)
12 months or more (353) (533)
Total $ (425) $ (711)
Residential mortgage backed securities    
Number of securities    
Less than 12 months | security 79 203
12 months or more | security 630 659
Total | security 709 862
Fair Value    
Less than 12 months $ 1,992 $ 6,728
12 months or more 8,171 9,122
Total 10,163 15,850
Unrealized Losses    
Less than 12 months (9) (96)
12 months or more (726) (1,037)
Total $ (735) $ (1,133)
Commercial mortgage backed securities    
Number of securities    
Less than 12 months | security 8 24
12 months or more | security 172 233
Total | security 180 257
Fair Value    
Less than 12 months $ 117 $ 478
12 months or more 2,454 3,298
Total 2,571 3,776
Unrealized Losses    
Less than 12 months (1) (6)
12 months or more (119) (213)
Total $ (120) $ (219)
Asset backed securities    
Number of securities    
Less than 12 months | security 2 15
12 months or more | security 32 37
Total | security 34 52
Fair Value    
Less than 12 months $ 20 $ 309
12 months or more 284 384
Total 304 693
Unrealized Losses    
Less than 12 months 0 (2)
12 months or more (23) (37)
Total $ (23) $ (39)
State and municipal obligations    
Number of securities    
Less than 12 months | security 9 21
12 months or more | security 42 45
Total | security 51 66
Fair Value    
Less than 12 months $ 53 $ 57
12 months or more 123 133
Total 176 190
Unrealized Losses    
Less than 12 months (1) (2)
12 months or more (14) (17)
Total $ (15) $ (19)
U.S. government and agency obligations    
Number of securities    
Less than 12 months | security 8 1
12 months or more | security 0 0
Total | security 8 1
Fair Value    
Less than 12 months $ 477 $ 100
12 months or more 0 0
Total 477 100
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 1 3
Total | security 1 3
Fair Value    
Less than 12 months $ 0 $ 0
12 months or more 5 12
Total 5 12
Unrealized Losses    
Less than 12 months 0 0
12 months or more 0 0
Total $ 0 $ 0