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Investments (EITF info-Number of securities and unrealized losses) (Details) - Ameriprise Financial [Member]
$ in Millions
Sep. 30, 2020
USD ($)
Positions
Dec. 31, 2019
USD ($)
Positions
Number of securities    
Less than 12 months | Positions 281 255
12 months or more | Positions 129 202
Total | Positions 410 457
Unrealized Losses    
Less than 12 months $ (68) $ (17)
12 months or more (27) (20)
Total (95) (37)
Fair Value    
Less than 12 months 4,655 6,637
12 months or more 982 1,936
Debt Securities, Available-for-sale, Unrealized Loss Position $ 5,637 $ 8,573
Corporate debt securities [Member]    
Number of securities    
Less than 12 months | Positions 76 13
12 months or more | Positions 16 23
Total | Positions 92 36
Unrealized Losses    
Less than 12 months $ (29) $ (1)
12 months or more (5) (3)
Total (34) (4)
Fair Value    
Less than 12 months 817 66
12 months or more 24 173
Debt Securities, Available-for-sale, Unrealized Loss Position $ 841 $ 239
Residential mortgage backed securities [Member]    
Number of securities    
Less than 12 months | Positions 93 150
12 months or more | Positions 73 118
Total | Positions 166 268
Unrealized Losses    
Less than 12 months $ (5) $ (10)
12 months or more (2) (9)
Total (7) (19)
Fair Value    
Less than 12 months 1,677 4,328
12 months or more 434 1,164
Debt Securities, Available-for-sale, Unrealized Loss Position $ 2,111 $ 5,492
Commercial mortgage backed securities [Member]    
Number of securities    
Less than 12 months | Positions 49 52
12 months or more | Positions 18 31
Total | Positions 67 83
Unrealized Losses    
Less than 12 months $ (24) $ (3)
12 months or more (15) (3)
Total (39) (6)
Fair Value    
Less than 12 months 1,190 1,622
12 months or more 326 314
Debt Securities, Available-for-sale, Unrealized Loss Position $ 1,516 $ 1,936
Asset backed securities [Member]    
Number of securities    
Less than 12 months | Positions 53 34
12 months or more | Positions 11 16
Total | Positions 64 50
Unrealized Losses    
Less than 12 months $ (8) $ (3)
12 months or more (4) (1)
Total (12) (4)
Fair Value    
Less than 12 months 932 598
12 months or more 184 213
Debt Securities, Available-for-sale, Unrealized Loss Position $ 1,116 $ 811
State and municipal obligations [Member]    
Number of securities    
Less than 12 months | Positions 4 5
12 months or more | Positions 1 4
Total | Positions 5 9
Unrealized Losses    
Less than 12 months $ (1) $ 0
12 months or more 0 (2)
Total (1) (2)
Fair Value    
Less than 12 months 14 23
12 months or more 4 57
Debt Securities, Available-for-sale, Unrealized Loss Position $ 18 $ 80
Foreign government bonds and obligations [Member]    
Number of securities    
Less than 12 months | Positions 6 1
12 months or more | Positions 10 10
Total | Positions 16 11
Unrealized Losses    
Less than 12 months $ (1) $ 0
12 months or more (1) (2)
Total (2) (2)
Fair Value    
Less than 12 months 25 0
12 months or more 10 15
Debt Securities, Available-for-sale, Unrealized Loss Position $ 35 $ 15