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Investments (EITF info-Number of securities and unrealized losses) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Positions
Dec. 31, 2019
USD ($)
Positions
Unrealized Losses [Abstract]    
Allowance for credit losses $ 13  
Ameriprise Financial [Member]    
Number of securities    
Less than 12 months | Positions 771 255
12 months or more | Positions 139 202
Total | Positions 910 457
Unrealized Losses [Abstract]    
Less than 12 months $ (668) $ (17)
12 months or more (46) (20)
Total $ (714) $ (37)
Ameriprise Financial [Member] | Corporate debt securities [Member]    
Number of securities    
Less than 12 months | Positions 233 13
12 months or more | Positions 10 23
Total | Positions 243 36
Unrealized Losses [Abstract]    
Less than 12 months $ (337) $ (1)
12 months or more (11) (3)
Total $ (348) $ (4)
Ameriprise Financial [Member] | Residential mortgage backed securities [Member]    
Number of securities    
Less than 12 months | Positions 326 150
12 months or more | Positions 90 118
Total | Positions 416 268
Unrealized Losses [Abstract]    
Less than 12 months $ (122) $ (10)
12 months or more (14) (9)
Total $ (136) $ (19)
Ameriprise Financial [Member] | Commercial mortgage backed securities [Member]    
Number of securities    
Less than 12 months | Positions 99 52
12 months or more | Positions 20 31
Total | Positions 119 83
Unrealized Losses [Abstract]    
Less than 12 months $ (136) $ (3)
12 months or more (8) (3)
Total $ (144) $ (6)
Ameriprise Financial [Member] | Asset backed securities [Member]    
Number of securities    
Less than 12 months | Positions 87 34
12 months or more | Positions 9 16
Total | Positions 96 50
Unrealized Losses [Abstract]    
Less than 12 months $ (63) $ (3)
12 months or more (10) (1)
Total $ (73) $ (4)
Ameriprise Financial [Member] | State and municipal obligations [Member]    
Number of securities    
Less than 12 months | Positions 6 5
12 months or more | Positions 2 4
Total | Positions 8 9
Unrealized Losses [Abstract]    
Less than 12 months $ (4) $ 0
12 months or more (1) (2)
Total $ (5) $ (2)
Ameriprise Financial [Member] | Foreign government bonds and obligations [Member]    
Number of securities    
Less than 12 months | Positions 20 1
12 months or more | Positions 8 10
Total | Positions 28 11
Unrealized Losses [Abstract]    
Less than 12 months $ (6) $ 0
12 months or more (2) (2)
Total $ (8) $ (2)