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Investment Information - Aging of available for sale securities in an unrealized loss position (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | $ 6,143 | $ 12,494
Estimated Fair Value - 12 Months or More | 3,604 | 5,080
Estimated Fair Value | 9,747 | 17,574
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (147) | (290)
Gross Unrealized Losses - 12 Months or More | (248) | (404)
Gross Unrealized Losses | (395) | (694)
Fixed maturities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 5,749 | 12,397
Estimated Fair Value - 12 Months or More | 3,604 | 5,080
Estimated Fair Value | 9,353 | 17,477
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (146) | (288)
Gross Unrealized Losses - 12 Months or More | (248) | (404)
Gross Unrealized Losses | (394) | (692)
Corporate bonds |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 1,944 | 4,582
Estimated Fair Value - 12 Months or More | 2,043 | 2,924
Estimated Fair Value | 3,987 | 7,506
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (83) | (114)
Gross Unrealized Losses - 12 Months or More | (135) | (232)
Gross Unrealized Losses | (218) | (346)
U.S. government and government agencies |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 1,727 | 5,130
Estimated Fair Value - 12 Months or More | 308 | 516
Estimated Fair Value | 2,035 | 5,646
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (29) | (100)
Gross Unrealized Losses - 12 Months or More | (19) | (49)
Gross Unrealized Losses | (48) | (149)
Non-U.S. government securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 1,132 | 1,650
Estimated Fair Value - 12 Months or More | 395 | 418
Estimated Fair Value | 1,527 | 2,068
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (25) | (58)
Gross Unrealized Losses - 12 Months or More | (45) | (49)
Gross Unrealized Losses | (70) | (107)
Residential mortgage backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 158 | 571
Estimated Fair Value - 12 Months or More | 175 | 186
Estimated Fair Value | 333 | 757
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (3) | (6)
Gross Unrealized Losses - 12 Months or More | (21) | (25)
Gross Unrealized Losses | (24) | (31)
Asset backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 497 | 236
Estimated Fair Value - 12 Months or More | 348 | 426
Estimated Fair Value | 845 | 662
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (4) | (8)
Gross Unrealized Losses - 12 Months or More | (16) | (24)
Gross Unrealized Losses | (20) | (32)
Commercial mortgage backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 276 | 180
Estimated Fair Value - 12 Months or More | 188 | 434
Estimated Fair Value | 464 | 614
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (2) | (1)
Gross Unrealized Losses - 12 Months or More | (5) | (10)
Gross Unrealized Losses | (7) | (11)
Municipal bonds |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 15 | 48
Estimated Fair Value - 12 Months or More | 147 | 176
Estimated Fair Value | 162 | 224
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | 0 | (1)
Gross Unrealized Losses - 12 Months or More | (7) | (15)
Gross Unrealized Losses | (7) | (16)
Short-term investments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 394 | 97
Estimated Fair Value - 12 Months or More | 0 | 0
Estimated Fair Value | 394 | 97
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (1) | (2)
Gross Unrealized Losses - 12 Months or More | 0 | 0
Gross Unrealized Losses | $ (1) | $ (2)

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