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Investments - Total unrealized losses (Details)
$ in Millions
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Total unrealized losses    
Total unrealized losses $ (41)  
Fixed income securities    
Fixed Income Securities [Abstract]    
Number of issues | security 132 1,458
Fair value $ 662 $ 7,088
Unrealized losses $ (14) $ (220)
Fixed income securities    
Number of issues | security 71 436
Fair value $ 275 $ 2,701
Unrealized losses (27) (169)
Total unrealized losses    
Total unrealized losses $ (41) $ (389)
U.S. government and agencies    
Fixed Income Securities [Abstract]    
Number of issues | security 6 2
Fair value $ 74 $ 6
Unrealized losses $ 0 $ 0
Fixed income securities    
Number of issues | security 0 1
Fair value $ 0 $ 1
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ 0 $ 0
Municipal    
Fixed Income Securities [Abstract]    
Number of issues | security 4 38
Fair value $ 22 $ 98
Unrealized losses $ (5) $ (1)
Fixed income securities    
Number of issues | security 1 5
Fair value $ 14 $ 26
Unrealized losses (2) (3)
Total unrealized losses    
Total unrealized losses $ (7) $ (4)
Corporate    
Fixed Income Securities [Abstract]    
Number of issues | security 92 1,261
Fair value $ 504 $ 6,799
Unrealized losses $ (8) $ (218)
Fixed income securities    
Number of issues | security 43 370
Fair value $ 237 $ 2,633
Unrealized losses (22) (163)
Total unrealized losses    
Total unrealized losses $ (30) $ (381)
ABS    
Fixed Income Securities [Abstract]    
Number of issues | security 22 30
Fair value $ 61 $ 167
Unrealized losses $ (1) $ (1)
Fixed income securities    
Number of issues | security 5 11
Fair value $ 19 $ 31
Unrealized losses (2) (2)
Total unrealized losses    
Total unrealized losses $ (3) $ (3)
MBS    
Fixed Income Securities [Abstract]    
Number of issues | security 8 127
Fair value $ 1 $ 18
Unrealized losses $ 0 $ 0
Fixed income securities    
Number of issues | security 22 49
Fair value $ 5 $ 10
Unrealized losses (1) (1)
Total unrealized losses    
Total unrealized losses $ (1) $ (1)
Investment grade fixed income securities    
Fixed Income Securities [Abstract]    
Number of issues | security 85 948
Fair value $ 524 $ 5,255
Unrealized losses $ (3) $ (121)
Fixed income securities    
Number of issues | security 39 388
Fair value $ 152 $ 2,551
Unrealized losses (17) (147)
Total unrealized losses    
Total unrealized losses $ (20) $ (268)
Below investment grade fixed income securities    
Fixed Income Securities [Abstract]    
Number of issues | security 47 510
Fair value $ 138 $ 1,833
Unrealized losses $ (11) $ (99)
Fixed income securities    
Number of issues | security 32 48
Fair value $ 123 $ 150
Unrealized losses (10) (22)
Total unrealized losses    
Total unrealized losses $ (21) $ (121)