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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, 2020
USD ($)
contract
Dec. 31, 2019
USD ($)
contract
U.S. government and agencies    
Less than 12 months    
Number of issues | contract   31
Fair value   $ 1,713
Unrealized losses   $ (26)
12 months or more    
Number of issues | contract   10
Fair value   $ 26
Unrealized losses   0
Total unrealized losses    
Total unrealized losses   $ (26)
Municipal    
Less than 12 months    
Number of issues | contract 470 307
Fair value $ 1,029 $ 576
Unrealized losses $ (28) $ (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 $ (28) $ (11)
Corporate    
Less than 12 months    
Number of issues | contract 1,838 186
Fair value $ 18,525 $ 1,392
Unrealized losses $ (1,161) $ (20)
12 months or more    
Number of issues | contract 31 65
Fair value $ 187 $ 485
Unrealized losses (70) (27)
Total unrealized losses    
Total unrealized losses $ (1,231) $ (47)
Foreign government    
Less than 12 months    
Number of issues | contract 25 55
Fair value $ 85 $ 412
Unrealized losses $ (3) $ (4)
12 months or more    
Number of issues | contract 1 6
Fair value $ 6 $ 102
Unrealized losses 0 (1)
Total unrealized losses    
Total unrealized losses $ (3) $ (5)
ABS    
Less than 12 months    
Number of issues | contract 63 36
Fair value $ 383 $ 193
Unrealized losses $ (13) $ (2)
12 months or more    
Number of issues | contract 13 23
Fair value $ 61 $ 160
Unrealized losses (6) (4)
Total unrealized losses    
Total unrealized losses $ (19) $ (6)
MBS    
Less than 12 months    
Number of issues | contract 35 27
Fair value $ 33 $ 15
Unrealized losses $ (3) $ 0
12 months or more    
Number of issues | contract 101 123
Fair value $ 7 $ 14
Unrealized losses 0 (1)
Total unrealized losses    
Total unrealized losses $ (3) $ (1)
Fixed income securities    
Less than 12 months    
Number of issues | contract 2,431 642
Fair value $ 20,055 $ 4,301
Unrealized losses $ (1,208) $ (61)
12 months or more    
Number of issues | contract 146 228
Fair value $ 261 $ 801
Unrealized losses (76) (35)
Total unrealized losses    
Total unrealized losses $ (1,284) $ (96)
Investment grade fixed income securities    
Less than 12 months    
Number of issues | contract 1,816 581
Fair value $ 15,130 $ 3,878
Unrealized losses $ (689) $ (41)
12 months or more    
Number of issues | contract 116 185
Fair value $ 130 $ 594
Unrealized losses (27) (20)
Total unrealized losses    
Total unrealized losses $ (716) $ (61)
Below investment grade fixed income securities    
Less than 12 months    
Number of issues | contract 615 61
Fair value $ 4,925 $ 423
Unrealized losses $ (519) $ (20)
12 months or more    
Number of issues | contract 30 43
Fair value $ 131 $ 207
Unrealized losses (49) (15)
Total unrealized losses    
Total unrealized losses $ (568) $ (35)