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Investments - Schedule of Gross Unrealized Losses and Fair Value by Type and Length of Time Held in a Continuous Unrealized Loss Position (Details)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
contract
Dec. 31, 2023
USD ($)
contract
Total unrealized losses    
Fixed income securities, at fair value $ 52,576 $ 48,865
Fixed income securities    
Less than 12 months    
Number of  issues | contract 1,555 611
Fair value $ 14,539 $ 5,274
Unrealized losses $ (206) $ (91)
12 months or more    
Number of  issues | contract 3,717 4,232
Fair value $ 19,822 $ 23,017
Unrealized losses (1,298) (1,343)
Total unrealized losses    
Total unrealized losses (1,504) (1,434)
Fixed income securities, at fair value 24 32
Fixed income securities, unrealized losses 6 3
Fixed income securities, credit loss allowance $ 4 $ 8
U.S. government and agencies    
Less than 12 months    
Number of  issues | contract 106 63
Fair value $ 3,935 $ 2,554
Unrealized losses $ (64) $ (38)
12 months or more    
Number of  issues | contract 135 117
Fair value $ 3,297 $ 2,513
Unrealized losses (130) (81)
Total unrealized losses    
Total unrealized losses (194) (119)
Fixed income securities, at fair value $ 10,564 $ 8,619
Municipal    
Less than 12 months    
Number of  issues | contract 629 271
Fair value $ 2,063 $ 400
Unrealized losses $ (19) $ (4)
12 months or more    
Number of  issues | contract 1,525 1,784
Fair value $ 2,060 $ 2,245
Unrealized losses (150) (148)
Total unrealized losses    
Total unrealized losses (169) (152)
Fixed income securities, at fair value $ 6,538 $ 6,006
Corporate    
Less than 12 months    
Number of  issues | contract 712 251
Fair value $ 7,939 $ 2,225
Unrealized losses $ (119) $ (48)
12 months or more    
Number of  issues | contract 1,883 2,106
Fair value $ 14,087 $ 17,319
Unrealized losses (1,001) (1,095)
Total unrealized losses    
Total unrealized losses (1,120) (1,143)
Fixed income securities, at fair value $ 32,514 $ 31,205
Foreign government    
Less than 12 months    
Number of  issues | contract 36 7
Fair value $ 257 $ 31
Unrealized losses $ (2) $ 0
12 months or more    
Number of  issues | contract 76 75
Fair value $ 286 $ 356
Unrealized losses (13) (13)
Total unrealized losses    
Total unrealized losses (15) (13)
Fixed income securities, at fair value $ 1,289 $ 1,290
ABS    
Less than 12 months    
Number of  issues | contract 72 19
Fair value $ 345 $ 64
Unrealized losses $ (2) $ (1)
12 months or more    
Number of  issues | contract 98 150
Fair value $ 92 $ 584
Unrealized losses (4) (6)
Total unrealized losses    
Total unrealized losses (6) (7)
Fixed income securities, at fair value $ 1,671 $ 1,745
Investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 1,462 568
Fair value $ 14,107 $ 5,061
Unrealized losses $ (196) $ (83)
12 months or more    
Number of  issues | contract 3,404 3,864
Fair value $ 17,754 $ 20,429
Unrealized losses (1,148) (1,151)
Total unrealized losses    
Total unrealized losses $ (1,344) $ (1,234)
Below investment grade fixed income securities    
Less than 12 months    
Number of  issues | contract 93 43
Fair value $ 432 $ 213
Unrealized losses $ (10) $ (8)
12 months or more    
Number of  issues | contract 313 368
Fair value $ 2,068 $ 2,588
Unrealized losses (150) (192)
Total unrealized losses    
Total unrealized losses $ (160) $ (200)