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Investments - Portfolio Monitoring (Details)
$ in Millions
Jun. 30, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Fixed income and equity securities    
Less than 12 months    
Number of issues | security   670
Fair value   $ 3,596
Unrealized losses   $ (34)
12 months or more    
Number of issues | security   218
Fair value   $ 1,425
Unrealized losses   (67)
Total unrealized losses    
Total unrealized losses $ (317)  
Total unrealized losses   $ (101)
Fixed income securities    
Less than 12 months    
Number of issues | security 1,487 583
Fair value $ 8,088 $ 3,530
Unrealized losses $ (220) $ (31)
12 months or more    
Number of issues | security 204 217
Fair value $ 1,179 $ 1,425
Unrealized losses (97) (67)
Total unrealized losses    
Total unrealized losses $ (317) $ (98)
U.S. government and agencies    
Less than 12 months    
Number of issues | security 7 17
Fair value $ 77 $ 443
Unrealized losses $ 0 $ (2)
12 months or more    
Number of issues | security 1 2
Fair value $ 5 $ 25
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ 0 $ (2)
Municipal    
Less than 12 months    
Number of issues | security 54 4
Fair value $ 117 $ 14
Unrealized losses $ (2) $ 0
12 months or more    
Number of issues | security 1 1
Fair value $ 12 $ 11
Unrealized losses (2) (3)
Total unrealized losses    
Total unrealized losses $ (4) $ (3)
Corporate    
Less than 12 months    
Number of issues | security 1,290 456
Fair value $ 7,670 $ 2,899
Unrealized losses $ (216) $ (28)
12 months or more    
Number of issues | security 135 144
Fair value $ 1,127 $ 1,324
Unrealized losses (90) (58)
Total unrealized losses    
Total unrealized losses $ (306) $ (86)
Foreign government    
Less than 12 months    
Number of issues | security 2  
Fair value $ 15  
Unrealized losses $ 0  
12 months or more    
Number of issues | security 0  
Fair value $ 0  
Unrealized losses 0  
Total unrealized losses    
Total unrealized losses $ 0  
ABS    
Less than 12 months    
Number of issues | security 41 33
Fair value $ 194 $ 170
Unrealized losses $ (1) $ (1)
12 months or more    
Number of issues | security 6 8
Fair value $ 9 $ 24
Unrealized losses (3) (3)
Total unrealized losses    
Total unrealized losses $ (4) $ (4)
RMBS    
Less than 12 months    
Number of issues | security 90 70
Fair value $ 4 $ 3
Unrealized losses $ 0 $ 0
12 months or more    
Number of issues | security 56 56
Fair value $ 16 $ 18
Unrealized losses (1) (1)
Total unrealized losses    
Total unrealized losses $ (1) $ (1)
CMBS    
Less than 12 months    
Number of issues | security 2 2
Fair value $ 11 $ 1
Unrealized losses $ (1) $ 0
12 months or more    
Number of issues | security 5 6
Fair value $ 10 $ 23
Unrealized losses (1) (2)
Total unrealized losses    
Total unrealized losses $ (2) $ (2)
Redeemable preferred stock    
Less than 12 months    
Number of issues | security 1 1
Fair value $ 0 $ 0
Unrealized losses $ 0 $ 0
12 months or more    
Number of issues | security 0 0
Fair value $ 0 $ 0
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ 0 $ 0
Equity securities    
Less than 12 months    
Number of issues | security   87
Fair value   $ 66
Unrealized losses   $ (3)
12 months or more    
Number of issues | security   1
Fair value   $ 0
Unrealized losses   0
Total unrealized losses    
Total unrealized losses   $ (3)
Investment grade fixed income securities    
Less than 12 months    
Number of issues | security 1,102 472
Fair value $ 6,719 $ 3,192
Unrealized losses $ (176) $ (22)
12 months or more    
Number of issues | security 171 181
Fair value $ 1,086 $ 1,320
Unrealized losses (86) (52)
Total unrealized losses    
Total unrealized losses $ (262) $ (74)
Below investment grade fixed income securities    
Less than 12 months    
Number of issues | security 385 111
Fair value $ 1,369 $ 338
Unrealized losses $ (44) $ (9)
12 months or more    
Number of issues | security 33 36
Fair value $ 93 $ 105
Unrealized losses (11) (15)
Total unrealized losses    
Total unrealized losses $ (55) $ (24)