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Investment Information - Aging of available for sale securities in an unrealized loss position (Details) - USD ($) $ in Millions | Mar. 31, 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 | $ 9,849 | $ 12,494
Estimated Fair Value - 12 Months or More | 4,356 | 5,080
Estimated Fair Value | 14,205 | 17,574
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (155) | (290)
Gross Unrealized Losses - 12 Months or More | (320) | (404)
Gross Unrealized Losses | (475) | (694)
Fixed maturities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 9,028 | 12,397
Estimated Fair Value - 12 Months or More | 4,356 | 5,080
Estimated Fair Value | 13,384 | 17,477
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (154) | (288)
Gross Unrealized Losses - 12 Months or More | (320) | (404)
Gross Unrealized Losses | (474) | (692)
Corporate bonds |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 3,812 | 4,582
Estimated Fair Value - 12 Months or More | 2,569 | 2,924
Estimated Fair Value | 6,381 | 7,506
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (84) | (114)
Gross Unrealized Losses - 12 Months or More | (183) | (232)
Gross Unrealized Losses | (267) | (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 | 2,160 | 5,130
Estimated Fair Value - 12 Months or More | 403 | 516
Estimated Fair Value | 2,563 | 5,646
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (25) | (100)
Gross Unrealized Losses - 12 Months or More | (28) | (49)
Gross Unrealized Losses | (53) | (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 | 1,387 | 1,650
Estimated Fair Value - 12 Months or More | 411 | 418
Estimated Fair Value | 1,798 | 2,068
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (33) | (58)
Gross Unrealized Losses - 12 Months or More | (48) | (49)
Gross Unrealized Losses | (81) | (107)
Residential mortgage backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 269 | 571
Estimated Fair Value - 12 Months or More | 180 | 186
Estimated Fair Value | 449 | 757
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (2) | (6)
Gross Unrealized Losses - 12 Months or More | (24) | (25)
Gross Unrealized Losses | (26) | (31)
Asset backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 1,016 | 236
Estimated Fair Value - 12 Months or More | 396 | 426
Estimated Fair Value | 1,412 | 662
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (7) | (8)
Gross Unrealized Losses - 12 Months or More | (23) | (24)
Gross Unrealized Losses | (30) | (32)
Commercial mortgage backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 367 | 180
Estimated Fair Value - 12 Months or More | 238 | 434
Estimated Fair Value | 605 | 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 | (7) | (10)
Gross Unrealized Losses | (9) | (11)
Municipal bonds |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 17 | 48
Estimated Fair Value - 12 Months or More | 159 | 176
Estimated Fair Value | 176 | 224
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Gross Unrealized Losses - Less than 12 Months | (1) | (1)
Gross Unrealized Losses - 12 Months or More | (7) | (15)
Gross Unrealized Losses | (8) | (16)
Short-term investments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Estimated Fair Value [Abstract] |  |
Estimated Fair Value - Less than 12 Months | 821 | 97
Estimated Fair Value - 12 Months or More | 0 | 0
Estimated Fair Value | 821 | 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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