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Investments - Portfolio Monitoring (Details)
$ in Millions
Sep. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Fixed income securities    
Less than 12 months    
Number of issues | security 152 1,458
Fair value $ 476 $ 7,088
Unrealized losses $ (10) $ (220)
12 months or more    
Number of issues | security 90 436
Fair value $ 376 $ 2,701
Unrealized losses (34) (169)
Total unrealized losses    
Total unrealized losses $ (44) $ (389)
U.S. government and agencies    
Less than 12 months    
Number of issues | security 2 2
Fair value $ 16 $ 6
Unrealized losses $ 0 $ 0
12 months or more    
Number of issues | security 0 1
Fair value $ 0 $ 1
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ 0 $ 0
Municipal    
Less than 12 months    
Number of issues | security 2 38
Fair value $ 2 $ 98
Unrealized losses $ 0 $ (1)
12 months or more    
Number of issues | security 1 5
Fair value $ 14 $ 26
Unrealized losses (3) (3)
Total unrealized losses    
Total unrealized losses $ (3) $ (4)
Corporate    
Less than 12 months    
Number of issues | security 123 1,260
Fair value $ 413 $ 6,799
Unrealized losses $ (9) $ (218)
12 months or more    
Number of issues | security 59 370
Fair value $ 343 $ 2,633
Unrealized losses (29) (163)
Total unrealized losses    
Total unrealized losses $ (38) $ (381)
ABS    
Less than 12 months    
Number of issues | security 18 30
Fair value $ 38 $ 167
Unrealized losses $ (1) $ (1)
12 months or more    
Number of issues | security 4 11
Fair value $ 13 $ 31
Unrealized losses (1) (2)
Total unrealized losses    
Total unrealized losses $ (2) $ (3)
RMBS    
Less than 12 months    
Number of issues | security 6 124
Fair value $ 2 $ 11
Unrealized losses $ 0 $ 0
12 months or more    
Number of issues | security 25 47
Fair value $ 4 $ 10
Unrealized losses 0 (1)
Total unrealized losses    
Total unrealized losses $ 0 $ (1)
CMBS    
Less than 12 months    
Number of issues | security 1 3
Fair value $ 5 $ 7
Unrealized losses $ 0 $ 0
12 months or more    
Number of issues | security 1 2
Fair value $ 2 $ 0
Unrealized losses (1) 0
Total unrealized losses    
Total unrealized losses $ (1) $ 0
Redeemable preferred stock    
Less than 12 months    
Number of issues | security 0 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
Investment grade fixed income securities    
Less than 12 months    
Number of issues | security 82 948
Fair value $ 325 $ 5,255
Unrealized losses $ (3) $ (121)
12 months or more    
Number of issues | security 52 388
Fair value $ 212 $ 2,551
Unrealized losses (18) (147)
Total unrealized losses    
Total unrealized losses $ (21) $ (268)
Below investment grade fixed income securities    
Less than 12 months    
Number of issues | security 70 510
Fair value $ 151 $ 1,833
Unrealized losses $ (7) $ (99)
12 months or more    
Number of issues | security 38 48
Fair value $ 164 $ 150
Unrealized losses (16) (22)
Total unrealized losses    
Total unrealized losses $ (23) $ (121)