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Investments - Gross unrealized losses and fair value by the type and length of time held in continuous unrealized loss position (Details)
$ in Millions
Jun. 30, 2021
USD ($)
contract
Dec. 31, 2020
USD ($)
contract
U.S. government and agencies    
Less than 12 months    
Number of  issues | contract 109 26
Fair value $ 3,926 $ 215
Unrealized losses $ (15) $ (1)
12 months or more    
Number of  issues | contract 0 0
Fair value $ 0 $ 0
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ (15) $ (1)
Municipal    
Less than 12 months    
Number of  issues | contract 479 43
Fair value $ 800 $ 116
Unrealized losses $ (9) $ (2)
12 months or more    
Number of  issues | contract 1 0
Fair value $ 4 $ 0
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ (9) $ (2)
Corporate    
Less than 12 months    
Number of  issues | contract 749 107
Fair value $ 4,868 $ 730
Unrealized losses $ (71) $ (21)
12 months or more    
Number of  issues | contract 16 14
Fair value $ 61 $ 46
Unrealized losses (14) (5)
Total unrealized losses    
Total unrealized losses $ (85) $ (26)
Foreign government    
Less than 12 months    
Number of  issues | contract 50 7
Fair value $ 224 $ 7
Unrealized losses $ (5) $ 0
12 months or more    
Number of  issues | contract 0 0
Fair value $ 0 $ 0
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ (5) $ 0
ABS    
Less than 12 months    
Number of  issues | contract 23 21
Fair value $ 198 $ 157
Unrealized losses $ (1) $ (2)
12 months or more    
Number of  issues | contract 8 12
Fair value $ 15 $ 43
Unrealized losses 0 (1)
Total unrealized losses    
Total unrealized losses $ (1) $ (3)
MBS    
Less than 12 months    
Number of  issues | contract 18 11
Fair value $ 2 $ 0
Unrealized losses $ 0 $ 0
12 months or more    
Number of  issues | contract 50 57
Fair value $ 0 $ 0
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ 0 $ 0
Fixed income securities    
Less than 12 months    
Number of  issues | contract 1,428 215
Fair value $ 10,018 $ 1,225
Unrealized losses $ (101) $ (26)
12 months or more    
Number of  issues | contract 75 83
Fair value $ 80 $ 89
Unrealized losses (14) (6)
Total unrealized losses    
Total unrealized losses $ (115) $ (32)
Investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 1,316 146
Fair value $ 9,205 $ 855
Unrealized losses $ (85) $ (8)
12 months or more    
Number of  issues | contract 59 66
Fair value $ 16 $ 45
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ (85) $ (8)
Below investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 112 69
Fair value $ 813 $ 370
Unrealized losses $ (16) $ (18)
12 months or more    
Number of  issues | contract 16 17
Fair value $ 64 $ 44
Unrealized losses (14) (6)
Total unrealized losses    
Total unrealized losses $ (30) $ (24)