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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, 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 3 31
Fair value $ 20 $ 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 171 307
Fair value $ 343 $ 576
Unrealized losses $ (6) $ (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 $ (6) $ (11)
Corporate    
Less than 12 months    
Number of issues | contract 527 186
Fair value $ 4,326 $ 1,392
Unrealized losses $ (232) $ (20)
12 months or more    
Number of issues | contract 36 65
Fair value $ 213 $ 485
Unrealized losses (52) (27)
Total unrealized losses    
Total unrealized losses $ (284) $ (47)
Foreign government    
Less than 12 months    
Number of issues | contract 1 55
Fair value $ 1 $ 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 53 36
Fair value $ 479 $ 193
Unrealized losses $ (15) $ (2)
12 months or more    
Number of issues | contract 16 23
Fair value $ 64 $ 160
Unrealized losses (9) (4)
Total unrealized losses    
Total unrealized losses $ (24) $ (6)
MBS    
Less than 12 months    
Number of issues | contract 28 27
Fair value $ 16 $ 15
Unrealized losses $ 0 $ 0
12 months or more    
Number of issues | contract 85 123
Fair value $ 3 $ 14
Unrealized losses 0 (1)
Total unrealized losses    
Total unrealized losses $ 0 $ (1)
Fixed income securities    
Less than 12 months    
Number of issues | contract 783 642
Fair value $ 5,185 $ 4,301
Unrealized losses $ (254) $ (61)
12 months or more    
Number of issues | contract 137 228
Fair value $ 280 $ 801
Unrealized losses (61) (35)
Total unrealized losses    
Total unrealized losses $ (315) $ (96)
Investment grade fixed income securities    
Less than 12 months    
Number of issues | contract 402 581
Fair value $ 2,253 $ 3,878
Unrealized losses $ (86) $ (41)
12 months or more    
Number of issues | contract 102 185
Fair value $ 114 $ 594
Unrealized losses (25) (20)
Total unrealized losses    
Total unrealized losses $ (111) $ (61)
Below investment grade fixed income securities    
Less than 12 months    
Number of issues | contract 381 61
Fair value $ 2,932 $ 423
Unrealized losses $ (168) $ (20)
12 months or more    
Number of issues | contract 35 43
Fair value $ 166 $ 207
Unrealized losses (36) (15)
Total unrealized losses    
Total unrealized losses $ (204) $ (35)