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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
Sep. 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 17 31
Fair value $ 350 $ 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 246 307
Fair value $ 511 $ 576
Unrealized losses $ (8) $ (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 $ (8) $ (11)
Corporate    
Less than 12 months    
Number of issues | contract 428 186
Fair value $ 3,969 $ 1,392
Unrealized losses $ (155) $ (20)
12 months or more    
Number of issues | contract 33 65
Fair value $ 200 $ 485
Unrealized losses (39) (27)
Total unrealized losses    
Total unrealized losses $ (194) $ (47)
Foreign government    
Less than 12 months    
Number of issues | contract 7 55
Fair value $ 14 $ 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 36 36
Fair value $ 392 $ 193
Unrealized losses $ (7) $ (2)
12 months or more    
Number of issues | contract 17 23
Fair value $ 67 $ 160
Unrealized losses (7) (4)
Total unrealized losses    
Total unrealized losses $ (14) $ (6)
MBS    
Less than 12 months    
Number of issues | contract 12 27
Fair value $ 1 $ 15
Unrealized losses $ 0 $ 0
12 months or more    
Number of issues | contract 80 123
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 746 642
Fair value $ 5,237 $ 4,301
Unrealized losses $ (171) $ (61)
12 months or more    
Number of issues | contract 130 228
Fair value $ 267 $ 801
Unrealized losses (46) (35)
Total unrealized losses    
Total unrealized losses $ (217) $ (96)
Investment grade fixed income securities    
Less than 12 months    
Number of issues | contract 508 581
Fair value $ 3,485 $ 3,878
Unrealized losses $ (63) $ (41)
12 months or more    
Number of issues | contract 99 185
Fair value $ 119 $ 594
Unrealized losses (20) (20)
Total unrealized losses    
Total unrealized losses $ (83) $ (61)
Below investment grade fixed income securities    
Less than 12 months    
Number of issues | contract 238 61
Fair value $ 1,752 $ 423
Unrealized losses $ (108) $ (20)
12 months or more    
Number of issues | contract 31 43
Fair value $ 148 $ 207
Unrealized losses (26) (15)
Total unrealized losses    
Total unrealized losses $ (134) $ (35)