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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
Mar. 31, 2021
USD ($)
contract
Dec. 31, 2020
USD ($)
contract
U.S. government and agencies    
Less than 12 months    
Number of  issues | contract 108 26
Fair value $ 2,084 $ 215
Unrealized losses $ (19) $ (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 $ (19) $ (1)
Municipal    
Less than 12 months    
Number of  issues | contract 804 43
Fair value $ 1,398 $ 116
Unrealized losses $ (36) $ (2)
12 months or more    
Number of  issues | contract 1 0
Fair value $ 5 $ 0
Unrealized losses 0 0
Total unrealized losses    
Total unrealized losses $ (36) $ (2)
Corporate    
Less than 12 months    
Number of  issues | contract 1,003 107
Fair value $ 6,715 $ 730
Unrealized losses $ (176) $ (21)
12 months or more    
Number of  issues | contract 25 14
Fair value $ 121 $ 46
Unrealized losses (11) (5)
Total unrealized losses    
Total unrealized losses $ (187) $ (26)
Foreign government    
Less than 12 months    
Number of  issues | contract 64 7
Fair value $ 289 $ 7
Unrealized losses $ (8) $ 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 $ (8) $ 0
ABS    
Less than 12 months    
Number of  issues | contract 15 21
Fair value $ 79 $ 157
Unrealized losses $ (2) $ (2)
12 months or more    
Number of  issues | contract 13 12
Fair value $ 50 $ 43
Unrealized losses 0 (1)
Total unrealized losses    
Total unrealized losses $ (2) $ (3)
MBS    
Less than 12 months    
Number of  issues | contract 15 11
Fair value $ 2 $ 0
Unrealized losses $ 0 $ 0
12 months or more    
Number of  issues | contract 55 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 2,009 215
Fair value $ 10,567 $ 1,225
Unrealized losses $ (241) $ (26)
12 months or more    
Number of  issues | contract 94 83
Fair value $ 176 $ 89
Unrealized losses (11) (6)
Total unrealized losses    
Total unrealized losses $ (252) $ (32)
Investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 1,821 146
Fair value $ 9,206 $ 855
Unrealized losses $ (207) $ (8)
12 months or more    
Number of  issues | contract 69 66
Fair value $ 67 $ 45
Unrealized losses (1) 0
Total unrealized losses    
Total unrealized losses $ (208) $ (8)
Below investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 188 69
Fair value $ 1,361 $ 370
Unrealized losses $ (34) $ (18)
12 months or more    
Number of  issues | contract 25 17
Fair value $ 109 $ 44
Unrealized losses (10) (6)
Total unrealized losses    
Total unrealized losses $ (44) $ (24)