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Investments - Total unrealized losses (Details)
$ in Millions
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Fixed income and equity securities    
Equity securities    
Number of issues | security   670
Fair value   $ 3,596
Unrealized losses   $ (34)
Equity securities    
Number of issues | security   218
Fair value   $ 1,425
Unrealized losses   (67)
Total unrealized losses    
Total fixed income and equity securities   $ (101)
Fixed income securities    
Fixed Income Securities [Abstract]    
Number of issues | security 1,458 583
Fair value $ 7,088 $ 3,530
Unrealized losses $ (220) $ (31)
Fixed income securities    
Number of issues | security 436 217
Fair value $ 2,701 $ 1,425
Unrealized losses (169) (67)
Total unrealized losses    
Total unrealized losses $ (389) $ (98)
U.S. government and agencies    
Fixed Income Securities [Abstract]    
Number of issues | security 2 17
Fair value $ 6 $ 443
Unrealized losses $ 0 $ (2)
Fixed income securities    
Number of issues | security 1 2
Fair value $ 1 $ 25
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ 0 $ (2)
Municipal    
Fixed Income Securities [Abstract]    
Number of issues | security 38 4
Fair value $ 98 $ 14
Unrealized losses $ (1) $ 0
Fixed income securities    
Number of issues | security 5 1
Fair value $ 26 $ 11
Unrealized losses (3) (3)
Total unrealized losses    
Total unrealized losses $ (4) $ (3)
Corporate    
Fixed Income Securities [Abstract]    
Number of issues | security 1,260 456
Fair value $ 6,799 $ 2,899
Unrealized losses $ (218) $ (28)
Fixed income securities    
Number of issues | security 370 144
Fair value $ 2,633 $ 1,324
Unrealized losses (163) (58)
Total unrealized losses    
Total unrealized losses $ (381) $ (86)
ABS    
Fixed Income Securities [Abstract]    
Number of issues | security 30 33
Fair value $ 167 $ 170
Unrealized losses $ (1) $ (1)
Fixed income securities    
Number of issues | security 11 8
Fair value $ 31 $ 24
Unrealized losses (2) (3)
Total unrealized losses    
Total unrealized losses $ (3) $ (4)
RMBS    
Fixed Income Securities [Abstract]    
Number of issues | security 124 70
Fair value $ 11 $ 3
Unrealized losses $ 0 $ 0
Fixed income securities    
Number of issues | security 47 56
Fair value $ 10 $ 18
Unrealized losses (1) (1)
Total unrealized losses    
Total unrealized losses $ (1) $ (1)
CMBS    
Fixed Income Securities [Abstract]    
Number of issues | security 3 2
Fair value $ 7 $ 1
Unrealized losses $ 0 $ 0
Fixed income securities    
Number of issues | security 2 6
Fair value $ 0 $ 23
Unrealized losses 0 (2)
Total unrealized losses    
Total unrealized losses $ 0 $ (2)
Redeemable preferred stock    
Fixed Income Securities [Abstract]    
Number of issues | security 1 1
Fair value $ 0 $ 0
Unrealized losses $ 0 $ 0
Fixed income securities    
Number of issues | security 0 0
Fair value $ 0 $ 0
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ 0 $ 0
Investment grade fixed income securities    
Fixed Income Securities [Abstract]    
Number of issues | security 948 472
Fair value $ 5,255 $ 3,192
Unrealized losses $ (121) $ (22)
Fixed income securities    
Number of issues | security 388 181
Fair value $ 2,551 $ 1,320
Unrealized losses (147) (52)
Total unrealized losses    
Total unrealized losses $ (268) $ (74)
Below investment grade fixed income securities    
Fixed Income Securities [Abstract]    
Number of issues | security 510 111
Fair value $ 1,833 $ 338
Unrealized losses $ (99) $ (9)
Fixed income securities    
Number of issues | security 48 36
Fair value $ 150 $ 105
Unrealized losses (22) (15)
Total unrealized losses    
Total unrealized losses $ (121) $ (24)
Equity securities    
Equity securities    
Number of issues | security   87
Fair value   $ 66
Unrealized losses   $ (3)
Equity securities    
Number of issues | security   1
Fair value   $ 0
Unrealized losses   0
Total unrealized losses    
Gross unrealized losses on equity securities   $ (3)