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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) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) contract | Dec. 31, 2023 USD ($) contract
Total unrealized losses |  |
Fixed income securities, at fair value | $ 50,777,000,000 | $ 48,865,000,000
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 1,096 | 611
Fair value | $ 10,766,000,000 | $ 5,274,000,000
Unrealized losses | $ (183,000,000) | $ (91,000,000)
12 months or more |  |
Number of issues | contract | 3,858 | 4,232
Fair value | $ 19,903,000,000 | $ 23,017,000,000
Unrealized losses | (1,285,000,000) | (1,343,000,000)
Total unrealized losses |  |
Total unrealized losses | (1,468,000,000) | (1,434,000,000)
Fixed income securities, at fair value | 3,000,000 | 32,000,000
Fixed income securities, unrealized losses | 0 | 3,000,000
Fixed income securities, credit loss allowance | $ 1,000,000 | $ 8,000,000
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 118 | 63
Fair value | $ 3,867,000,000 | $ 2,554,000,000
Unrealized losses | $ (85,000,000) | $ (38,000,000)
12 months or more |  |
Number of issues | contract | 104 | 117
Fair value | $ 2,196,000,000 | $ 2,513,000,000
Unrealized losses | (83,000,000) | (81,000,000)
Total unrealized losses |  |
Total unrealized losses | (168,000,000) | (119,000,000)
Fixed income securities, at fair value | $ 10,030,000,000 | $ 8,619,000,000
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 397 | 271
Fair value | $ 915,000,000 | $ 400,000,000
Unrealized losses | $ (9,000,000) | $ (4,000,000)
12 months or more |  |
Number of issues | contract | 1,600 | 1,784
Fair value | $ 2,106,000,000 | $ 2,245,000,000
Unrealized losses | (151,000,000) | (148,000,000)
Total unrealized losses |  |
Total unrealized losses | (160,000,000) | (152,000,000)
Fixed income securities, at fair value | $ 5,392,000,000 | $ 6,006,000,000
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 493 | 251
Fair value | $ 5,317,000,000 | $ 2,225,000,000
Unrealized losses | $ (84,000,000) | $ (48,000,000)
12 months or more |  |
Number of issues | contract | 1,962 | 2,106
Fair value | $ 15,133,000,000 | $ 17,319,000,000
Unrealized losses | (1,030,000,000) | (1,095,000,000)
Total unrealized losses |  |
Total unrealized losses | (1,114,000,000) | (1,143,000,000)
Fixed income securities, at fair value | $ 32,269,000,000 | $ 31,205,000,000
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 40 | 7
Fair value | $ 453,000,000 | $ 31,000,000
Unrealized losses | $ (3,000,000) | $ 0
12 months or more |  |
Number of issues | contract | 74 | 75
Fair value | $ 327,000,000 | $ 356,000,000
Unrealized losses | (16,000,000) | (13,000,000)
Total unrealized losses |  |
Total unrealized losses | (19,000,000) | (13,000,000)
Fixed income securities, at fair value | $ 1,240,000,000 | $ 1,290,000,000
ABS |  |
Less than 12 months |  |
Number of issues | contract | 48 | 19
Fair value | $ 214,000,000 | $ 64,000,000
Unrealized losses | $ (2,000,000) | $ (1,000,000)
12 months or more |  |
Number of issues | contract | 118 | 150
Fair value | $ 141,000,000 | $ 584,000,000
Unrealized losses | (5,000,000) | (6,000,000)
Total unrealized losses |  |
Total unrealized losses | (7,000,000) | (7,000,000)
Fixed income securities, at fair value | $ 1,846,000,000 | $ 1,745,000,000
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 1,032 | 568
Fair value | $ 10,551,000,000 | $ 5,061,000,000
Unrealized losses | $ (173,000,000) | $ (83,000,000)
12 months or more |  |
Number of issues | contract | 3,518 | 3,864
Fair value | $ 17,647,000,000 | $ 20,429,000,000
Unrealized losses | (1,121,000,000) | (1,151,000,000)
Total unrealized losses |  |
Total unrealized losses | $ (1,294,000,000) | $ (1,234,000,000)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 64 | 43
Fair value | $ 215,000,000 | $ 213,000,000
Unrealized losses | $ (10,000,000) | $ (8,000,000)
12 months or more |  |
Number of issues | contract | 340 | 368
Fair value | $ 2,256,000,000 | $ 2,588,000,000
Unrealized losses | (164,000,000) | (192,000,000)
Total unrealized losses |  |
Total unrealized losses | $ (174,000,000) | $ (200,000,000)

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