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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)

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