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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, 2020
USD ($)
contract
Dec. 31, 2019
USD ($)
contract
Total unrealized losses    
Total unrealized losses $ (1)  
U.S. government and agencies    
Less than 12 months    
Number of issues | contract 23 31
Fair value $ 185 $ 1,713
Unrealized losses $ (1) $ (26)
12 months or more    
Number of issues | contract 0 10
Fair value $ 0 $ 26
Unrealized losses $ 0 0
Total unrealized losses    
Total unrealized losses   $ (26)
Municipal    
Less than 12 months    
Number of issues | contract 47 307
Fair value $ 148 $ 576
Unrealized losses $ (2) $ (9)
12 months or more    
Number of issues | contract 0 1
Fair value $ 0 $ 14
Unrealized losses 0 (2)
Total unrealized losses    
Total unrealized losses $ (2) $ (11)
Corporate    
Less than 12 months    
Number of issues | contract 127 186
Fair value $ 1,229 $ 1,392
Unrealized losses $ (39) $ (20)
12 months or more    
Number of issues | contract 27 65
Fair value $ 187 $ 485
Unrealized losses (26) (27)
Total unrealized losses    
Total unrealized losses $ (65) $ (47)
Foreign government    
Less than 12 months    
Number of issues | contract 7 55
Fair value $ 7 $ 412
Unrealized losses $ 0 $ (4)
12 months or more    
Number of issues | contract 0 6
Fair value $ 0 $ 102
Unrealized losses 0 (1)
Total unrealized losses    
Total unrealized losses $ 0 $ (5)
ABS    
Less than 12 months    
Number of issues | contract 22 36
Fair value $ 160 $ 193
Unrealized losses $ (2) $ (2)
12 months or more    
Number of issues | contract 13 23
Fair value $ 49 $ 160
Unrealized losses (3) (4)
Total unrealized losses    
Total unrealized losses $ (5) $ (6)
Mortgage-backed securities    
Less than 12 months    
Number of issues | contract 14 27
Fair value $ 0 $ 15
Unrealized losses $ 0 $ 0
12 months or more    
Number of issues | contract 67 123
Fair value $ 0 $ 14
Unrealized losses 0 (1)
Total unrealized losses    
Total unrealized losses $ 0 $ (1)
Fixed income securities    
Less than 12 months    
Number of issues | contract 240 642
Fair value $ 1,729 $ 4,301
Unrealized losses $ (44) $ (61)
12 months or more    
Number of issues | contract 107 228
Fair value $ 236 $ 801
Unrealized losses (29) (35)
Total unrealized losses    
Total unrealized losses $ (73) $ (96)
Investment grade fixed income securities    
Less than 12 months    
Number of issues | contract 163 581
Fair value $ 1,193 $ 3,878
Unrealized losses $ (13) $ (41)
12 months or more    
Number of issues | contract 84 185
Fair value $ 117 $ 594
Unrealized losses (17) (20)
Total unrealized losses    
Total unrealized losses $ (30) $ (61)
Below investment grade fixed income securities    
Less than 12 months    
Number of issues | contract 77 61
Fair value $ 536 $ 423
Unrealized losses $ (31) $ (20)
12 months or more    
Number of issues | contract 23 43
Fair value $ 119 $ 207
Unrealized losses (12) (15)
Total unrealized losses    
Total unrealized losses $ (43) $ (35)