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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
Sep. 30, 2021
USD ($)
contract
Dec. 31, 2020
USD ($)
contract
U.S. government and agencies    
Less than 12 months    
Number of  issues | contract 112 26
Fair value $ 2,271 $ 215
Unrealized losses $ (14) $ (1)
12 months or more    
Number of  issues | contract 5 0
Fair value $ 6 $ 0
Unrealized losses (1) 0
Total unrealized losses    
Total unrealized losses $ (15) $ (1)
Municipal    
Less than 12 months    
Number of  issues | contract 804 43
Fair value $ 1,205 $ 116
Unrealized losses $ (17) $ (2)
12 months or more    
Number of  issues | contract 2 0
Fair value $ 14 $ 0
Unrealized losses (1) 0
Total unrealized losses    
Total unrealized losses $ (18) $ (2)
Corporate    
Less than 12 months    
Number of  issues | contract 939 107
Fair value $ 6,816 $ 730
Unrealized losses $ (96) $ (21)
12 months or more    
Number of  issues | contract 22 14
Fair value $ 122 $ 46
Unrealized losses (15) (5)
Total unrealized losses    
Total unrealized losses $ (111) $ (26)
Foreign government    
Less than 12 months    
Number of  issues | contract 66 7
Fair value $ 373 $ 7
Unrealized losses $ (7) $ 0
12 months or more    
Number of  issues | contract 3 0
Fair value $ 2 $ 0
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ (7) $ 0
ABS    
Less than 12 months    
Number of  issues | contract 26 21
Fair value $ 92 $ 157
Unrealized losses $ (1) $ (2)
12 months or more    
Number of  issues | contract 5 12
Fair value $ 8 $ 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 47 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 1,965 215
Fair value $ 10,759 $ 1,225
Unrealized losses $ (135) $ (26)
12 months or more    
Number of  issues | contract 84 83
Fair value $ 152 $ 89
Unrealized losses (17) (6)
Total unrealized losses    
Total unrealized losses $ (152) $ (32)
Investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 1,813 146
Fair value $ 9,593 $ 855
Unrealized losses $ (115) $ (8)
12 months or more    
Number of  issues | contract 69 66
Fair value $ 99 $ 45
Unrealized losses (5) 0
Total unrealized losses    
Total unrealized losses $ (120) $ (8)
Below investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 152 69
Fair value $ 1,166 $ 370
Unrealized losses $ (20) $ (18)
12 months or more    
Number of  issues | contract 15 17
Fair value $ 53 $ 44
Unrealized losses (12) (6)
Total unrealized losses    
Total unrealized losses $ (32) $ (24)