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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
Dec. 31, 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 $ 5,451 $ 215
Unrealized losses $ (24) $ (1)
12 months or more    
Number of issues | contract 4 0
Fair value $ 72 $ 0
Unrealized losses (2) 0
Total unrealized losses    
Total unrealized losses $ (26) $ (1)
Municipal    
Less than 12 months    
Number of issues | contract 767 43
Fair value $ 1,213 $ 116
Unrealized losses $ (15) $ (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 $ (16) $ (2)
Corporate    
Less than 12 months    
Number of issues | contract 1,197 107
Fair value $ 9,725 $ 730
Unrealized losses $ (176) $ (21)
12 months or more    
Number of issues | contract 22 14
Fair value $ 130 $ 46
Unrealized losses (16) (5)
Total unrealized losses    
Total unrealized losses $ (192) $ (26)
Foreign government    
Less than 12 months    
Number of issues | contract 51 7
Fair value $ 415 $ 7
Unrealized losses $ (6) $ 0
12 months or more    
Number of issues | contract 4 0
Fair value $ 3 $ 0
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ (6) $ 0
ABS    
Less than 12 months    
Number of issues | contract 80 32
Fair value $ 500 $ 157
Unrealized losses $ (2) $ (2)
12 months or more    
Number of issues | contract 53 69
Fair value $ 8 $ 43
Unrealized losses 0 (1)
Total unrealized losses    
Total unrealized losses $ (2) $ (3)
Fixed income securities    
Less than 12 months    
Number of issues | contract 2,207 215
Fair value $ 17,304 $ 1,225
Unrealized losses $ (223) $ (26)
12 months or more    
Number of issues | contract 85 83
Fair value $ 227 $ 89
Unrealized losses (19) (6)
Total unrealized losses    
Total unrealized losses $ (242) $ (32)
Investment grade fixed income securities    
Less than 12 months    
Number of issues | contract 1,993 146
Fair value $ 15,391 $ 855
Unrealized losses $ (188) $ (8)
12 months or more    
Number of issues | contract 71 66
Fair value $ 183 $ 45
Unrealized losses (8) 0
Total unrealized losses    
Total unrealized losses $ (196) $ (8)
Below investment grade fixed income securities    
Less than 12 months    
Number of issues | contract 214 69
Fair value $ 1,913 $ 370
Unrealized losses $ (35) $ (18)
12 months or more    
Number of issues | contract 14 17
Fair value $ 44 $ 44
Unrealized losses (11) (6)
Total unrealized losses    
Total unrealized losses $ (46) $ (24)