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Investments - Gross unrealized losses and fair value by type and length of time held in a continuous unrealized loss position (Details)
$ in Millions
Dec. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
U.S. government and agencies    
Less than 12 months    
Number of issues | security 10 6
Fair value $ 17 $ 74
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
Municipal    
Less than 12 months    
Number of issues | security 7 4
Fair value $ 31 $ 22
Unrealized losses $ 0 $ (5)
12 months or more    
Number of issues | security 0 1
Fair value $ 0 $ 14
Unrealized losses 0 (2)
Total unrealized losses    
Total unrealized losses $ 0 $ (7)
Corporate    
Less than 12 months    
Number of issues | security 114 92
Fair value $ 558 $ 504
Unrealized losses $ (19) $ (8)
12 months or more    
Number of issues | security 25 43
Fair value $ 153 $ 237
Unrealized losses (21) (22)
Total unrealized losses    
Total unrealized losses $ (40) $ (30)
ABS    
Less than 12 months    
Number of issues | security 5 22
Fair value $ 2 $ 61
Unrealized losses $ 0 $ (1)
12 months or more    
Number of issues | security 4 5
Fair value $ 5 $ 19
Unrealized losses (2) (2)
Total unrealized losses    
Total unrealized losses $ (2) $ (3)
MBS    
Less than 12 months    
Number of issues | security 3 8
Fair value $ 0 $ 1
Unrealized losses $ 0 $ 0
12 months or more    
Number of issues | security 10 22
Fair value $ 0 $ 5
Unrealized losses 0 (1)
Total unrealized losses    
Total unrealized losses $ 0 $ (1)
Fixed income securities    
Less than 12 months    
Number of issues | security 139 132
Fair value $ 608 $ 662
Unrealized losses $ (19) $ (14)
12 months or more    
Number of issues | security 39 71
Fair value $ 158 $ 275
Unrealized losses (23) (27)
Total unrealized losses    
Total unrealized losses $ (42) $ (41)
Investment grade fixed income securities    
Less than 12 months    
Number of issues | security 69 85
Fair value $ 388 $ 524
Unrealized losses $ (5) $ (3)
12 months or more    
Number of issues | security 19 39
Fair value $ 73 $ 152
Unrealized losses (17) (17)
Total unrealized losses    
Total unrealized losses $ (22) $ (20)
Below investment grade fixed income securities    
Less than 12 months    
Number of issues | security 70 47
Fair value $ 220 $ 138
Unrealized losses $ (14) $ (11)
12 months or more    
Number of issues | security 20 32
Fair value $ 85 $ 123
Unrealized losses (6) (10)
Total unrealized losses    
Total unrealized losses $ (20) $ (21)