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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 | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) contract | Dec. 31, 2023 USD ($) contract
Total unrealized losses |  |
Fixed income securities, at fair value | $ 53,961 | $ 48,865
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 321 | 611
Fair value | $ 3,031 | $ 5,274
Unrealized losses | $ (30) | $ (91)
12 months or more |  |
Number of issues | contract | 2,673 | 4,232
Fair value | $ 13,522 | $ 23,017
Unrealized losses | (599) | (1,343)
Total unrealized losses |  |
Total unrealized losses | (629) | (1,434)
Fixed income securities, at fair value | 19 | 32
Fixed income securities, unrealized losses | 7 | 3
Fixed income securities, credit loss allowance | $ 3 | $ 8
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 33 | 63
Fair value | $ 1,299 | $ 2,554
Unrealized losses | $ (11) | $ (38)
12 months or more |  |
Number of issues | contract | 69 | 117
Fair value | $ 914 | $ 2,513
Unrealized losses | (30) | (81)
Total unrealized losses |  |
Total unrealized losses | (41) | (119)
Fixed income securities, at fair value | $ 9,246 | $ 8,619
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 119 | 271
Fair value | $ 352 | $ 400
Unrealized losses | $ (1) | $ (4)
12 months or more |  |
Number of issues | contract | 1,214 | 1,784
Fair value | $ 1,817 | $ 2,245
Unrealized losses | (95) | (148)
Total unrealized losses |  |
Total unrealized losses | (96) | (152)
Fixed income securities, at fair value | $ 8,258 | $ 6,006
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 149 | 251
Fair value | $ 1,288 | $ 2,225
Unrealized losses | $ (18) | $ (48)
12 months or more |  |
Number of issues | contract | 1,249 | 2,106
Fair value | $ 10,608 | $ 17,319
Unrealized losses | (465) | (1,095)
Total unrealized losses |  |
Total unrealized losses | (483) | (1,143)
Fixed income securities, at fair value | $ 33,796 | $ 31,205
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 1 | 7
Fair value | $ 10 | $ 31
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 56 | 75
Fair value | $ 139 | $ 356
Unrealized losses | (6) | (13)
Total unrealized losses |  |
Total unrealized losses | (6) | (13)
Fixed income securities, at fair value | $ 1,477 | $ 1,290
ABS |  |
Less than 12 months |  |
Number of issues | contract | 19 | 19
Fair value | $ 82 | $ 64
Unrealized losses | $ 0 | $ (1)
12 months or more |  |
Number of issues | contract | 85 | 150
Fair value | $ 44 | $ 584
Unrealized losses | (3) | (6)
Total unrealized losses |  |
Total unrealized losses | (3) | (7)
Fixed income securities, at fair value | $ 1,184 | $ 1,745
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 280 | 568
Fair value | $ 2,755 | $ 5,061
Unrealized losses | $ (25) | $ (83)
12 months or more |  |
Number of issues | contract | 2,459 | 3,864
Fair value | $ 11,984 | $ 20,429
Unrealized losses | (533) | (1,151)
Total unrealized losses |  |
Total unrealized losses | $ (558) | $ (1,234)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 41 | 43
Fair value | $ 276 | $ 213
Unrealized losses | $ (5) | $ (8)
12 months or more |  |
Number of issues | contract | 214 | 368
Fair value | $ 1,538 | $ 2,588
Unrealized losses | (66) | (192)
Total unrealized losses |  |
Total unrealized losses | $ (71) | $ (200)

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