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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, 2025 USD ($) contract | Dec. 31, 2024 USD ($) contract
Total unrealized losses |  |
Fixed income securities, at fair value | $ 57,186 | $ 52,747
Fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 843 | 2,204
Fair value | $ 12,770 | $ 22,824
Unrealized losses | $ (89) | $ (491)
12 months or more |  |
Number of issues | contract | 1,584 | 2,583
Fair value | $ 6,701 | $ 10,500
Unrealized losses | (305) | (739)
Total unrealized losses |  |
Total unrealized losses | (394) | (1,230)
Fixed income securities, at fair value | 8 | 16
Fixed income securities, unrealized losses | 0 | 1
Fixed income securities, credit loss allowance | $ 1 | $ 3
U.S. government and agencies |  |
Less than 12 months |  |
Number of issues | contract | 36 | 179
Fair value | $ 6,679 | $ 8,520
Unrealized losses | $ (16) | $ (256)
12 months or more |  |
Number of issues | contract | 74 | 99
Fair value | $ 260 | $ 801
Unrealized losses | (4) | (74)
Total unrealized losses |  |
Total unrealized losses | (20) | (330)
Fixed income securities, at fair value | $ 13,525 | $ 11,108
Municipal |  |
Less than 12 months |  |
Number of issues | contract | 342 | 990
Fair value | $ 2,262 | $ 4,889
Unrealized losses | $ (49) | $ (67)
12 months or more |  |
Number of issues | contract | 526 | 1,089
Fair value | $ 958 | $ 1,693
Unrealized losses | (50) | (109)
Total unrealized losses |  |
Total unrealized losses | (99) | (176)
Fixed income securities, at fair value | $ 6,226 | $ 8,842
Corporate |  |
Less than 12 months |  |
Number of issues | contract | 351 | 943
Fair value | $ 3,030 | $ 9,178
Unrealized losses | $ (18) | $ (166)
12 months or more |  |
Number of issues | contract | 852 | 1,237
Fair value | $ 5,393 | $ 7,877
Unrealized losses | (242) | (544)
Total unrealized losses |  |
Total unrealized losses | (260) | (710)
Fixed income securities, at fair value | $ 32,880 | $ 30,192
Foreign government |  |
Less than 12 months |  |
Number of issues | contract | 45 | 42
Fair value | $ 173 | $ 159
Unrealized losses | $ (3) | $ (2)
12 months or more |  |
Number of issues | contract | 56 | 73
Fair value | $ 43 | $ 73
Unrealized losses | (7) | (8)
Total unrealized losses |  |
Total unrealized losses | (10) | (10)
Fixed income securities, at fair value | $ 1,435 | $ 1,364
ABS |  |
Less than 12 months |  |
Number of issues | contract | 20 | 15
Fair value | $ 85 | $ 76
Unrealized losses | $ (1) | $ 0
12 months or more |  |
Number of issues | contract | 12 | 15
Fair value | $ 44 | $ 51
Unrealized losses | (2) | (4)
Total unrealized losses |  |
Total unrealized losses | (3) | (4)
Fixed income securities, at fair value | $ 986 | $ 1,145
MBS |  |
Less than 12 months |  |
Number of issues | contract | 49 | 35
Fair value | $ 541 | $ 2
Unrealized losses | $ (2) | $ 0
12 months or more |  |
Number of issues | contract | 64 | 70
Fair value | $ 3 | $ 5
Unrealized losses | 0 | 0
Total unrealized losses |  |
Total unrealized losses | (2) | 0
Fixed income securities, at fair value | $ 2,134 | $ 96
Investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 695 | 2,002
Fair value | $ 12,102 | $ 21,846
Unrealized losses | $ (82) | $ (473)
12 months or more |  |
Number of issues | contract | 1,428 | 2,367
Fair value | $ 5,955 | $ 9,281
Unrealized losses | (271) | (655)
Total unrealized losses |  |
Total unrealized losses | $ (353) | $ (1,128)
Below investment grade fixed income securities |  |
Less than 12 months |  |
Number of issues | contract | 148 | 202
Fair value | $ 668 | $ 978
Unrealized losses | $ (7) | $ (18)
12 months or more |  |
Number of issues | contract | 156 | 216
Fair value | $ 746 | $ 1,219
Unrealized losses | (34) | (84)
Total unrealized losses |  |
Total unrealized losses | $ (41) | $ (102)

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