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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, 2025 USD ($) contract | Dec. 31, 2024 USD ($) contract
Total unrealized losses |  |
Fixed income securities, at fair value | $ 54,435 | $ 52,747
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 1,125 | 2,204
Fair value | $ 7,806 | $ 22,824
Unrealized losses | $ (186) | $ (491)
12 months or more |  |
Number of issues | contract | 1,843 | 2,583
Fair value | $ 7,378 | $ 10,500
Unrealized losses | (395) | (739)
Total unrealized losses |  |
Total unrealized losses | (581) | (1,230)
Fixed income securities, at fair value | 10 | 16
Fixed income securities, unrealized losses | 1 | 1
Fixed income securities, credit loss allowance | $ 1 | $ 3
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 81 | 179
Fair value | $ 1,179 | $ 8,520
Unrealized losses | $ (5) | $ (256)
12 months or more |  |
Number of issues | contract | 56 | 99
Fair value | $ 357 | $ 801
Unrealized losses | (9) | (74)
Total unrealized losses |  |
Total unrealized losses | (14) | (330)
Fixed income securities, at fair value | $ 15,712 | $ 11,108
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 571 | 990
Fair value | $ 3,703 | $ 4,889
Unrealized losses | $ (123) | $ (67)
12 months or more |  |
Number of issues | contract | 697 | 1,089
Fair value | $ 1,176 | $ 1,693
Unrealized losses | (71) | (109)
Total unrealized losses |  |
Total unrealized losses | (194) | (176)
Fixed income securities, at fair value | $ 7,286 | $ 8,842
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 366 | 943
Fair value | $ 2,456 | $ 9,178
Unrealized losses | $ (53) | $ (166)
12 months or more |  |
Number of issues | contract | 948 | 1,237
Fair value | $ 5,750 | $ 7,877
Unrealized losses | (304) | (544)
Total unrealized losses |  |
Total unrealized losses | (357) | (710)
Fixed income securities, at fair value | $ 27,962 | $ 30,192
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 53 | 42
Fair value | $ 298 | $ 159
Unrealized losses | $ (4) | $ (2)
12 months or more |  |
Number of issues | contract | 62 | 73
Fair value | $ 47 | $ 73
Unrealized losses | (8) | (8)
Total unrealized losses |  |
Total unrealized losses | (12) | (10)
Fixed income securities, at fair value | $ 1,391 | $ 1,364
ABS |  |
Less than 12 months |  |
Number of issues | contract | 40 | 15
Fair value | $ 164 | $ 76
Unrealized losses | $ (1) | $ 0
12 months or more |  |
Number of issues | contract | 12 | 15
Fair value | $ 44 | $ 51
Unrealized losses | (3) | (4)
Total unrealized losses |  |
Total unrealized losses | (4) | (4)
Fixed income securities, at fair value | $ 983 | $ 1,145
MBS |  |
Less than 12 months |  |
Number of issues | contract | 14 | 35
Fair value | $ 6 | $ 2
Unrealized losses | $ 0 | $ 0
12 months or more |  |
Number of issues | contract | 68 | 70
Fair value | $ 4 | $ 5
Unrealized losses | 0 | 0
Total unrealized losses |  |
Total unrealized losses | 0 | 0
Fixed income securities, at fair value | $ 1,101 | $ 96
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 981 | 2,002
Fair value | $ 7,362 | $ 21,846
Unrealized losses | $ (160) | $ (473)
12 months or more |  |
Number of issues | contract | 1,665 | 2,367
Fair value | $ 6,524 | $ 9,281
Unrealized losses | (350) | (655)
Total unrealized losses |  |
Total unrealized losses | $ (510) | $ (1,128)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 144 | 202
Fair value | $ 444 | $ 978
Unrealized losses | $ (26) | $ (18)
12 months or more |  |
Number of issues | contract | 178 | 216
Fair value | $ 854 | $ 1,219
Unrealized losses | (45) | (84)
Total unrealized losses |  |
Total unrealized losses | $ (71) | $ (102)

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