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Investments (EITF info-Number of securities and unrealized losses) (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Positions
Dec. 31, 2019
USD ($)
Positions
Unrealized losses    
Investment Grade Available For Sale Securities with Gross Unrealized Losses 92.00%  
Ameriprise Financial [Member]    
Number of securities    
Less than 12 months | Positions 153 255
12 months or more | Positions 122 202
Total | Positions 275 457
Unrealized losses    
Less than 12 months | $ $ (17) $ (17)
12 months or more | $ (17) (20)
Total | $ $ (34) $ (37)
Ameriprise Financial [Member] | Corporate debt securities [Member]    
Number of securities    
Less than 12 months | Positions 26 13
12 months or more | Positions 11 23
Total | Positions 37 36
Unrealized losses    
Less than 12 months | $ $ (1) $ (1)
12 months or more | $ (1) (3)
Total | $ $ (2) $ (4)
Ameriprise Financial [Member] | Residential mortgage backed securities [Member]    
Number of securities    
Less than 12 months | Positions 72 150
12 months or more | Positions 71 118
Total | Positions 143 268
Unrealized losses    
Less than 12 months | $ $ (2) $ (10)
12 months or more | $ (2) (9)
Total | $ $ (4) $ (19)
Ameriprise Financial [Member] | Commercial mortgage backed securities [Member]    
Number of securities    
Less than 12 months | Positions 35 52
12 months or more | Positions 19 31
Total | Positions 54 83
Unrealized losses    
Less than 12 months | $ $ (11) $ (3)
12 months or more | $ (10) (3)
Total | $ $ (21) $ (6)
Ameriprise Financial [Member] | Asset backed securities [Member]    
Number of securities    
Less than 12 months | Positions 17 34
12 months or more | Positions 13 16
Total | Positions 30 50
Unrealized losses    
Less than 12 months | $ $ (3) $ (3)
12 months or more | $ (2) (1)
Total | $ $ (5) $ (4)
Ameriprise Financial [Member] | State and municipal obligations [Member]    
Number of securities    
Less than 12 months | Positions 2 5
12 months or more | Positions 1 4
Total | Positions 3 9
Unrealized losses    
Less than 12 months | $ $ 0 $ 0
12 months or more | $ (1) (2)
Total | $ $ (1) $ (2)
Ameriprise Financial [Member] | Foreign government bonds and obligations [Member]    
Number of securities    
Less than 12 months | Positions 1 1
12 months or more | Positions 7 10
Total | Positions 8 11
Unrealized losses    
Less than 12 months | $ $ 0 $ 0
12 months or more | $ (1) (2)
Total | $ $ (1) $ (2)