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Investments - Schedule of Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details) $ in Millions | Mar. 31, 2025 USD ($) security | Dec. 31, 2024 USD ($) security
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | $ 12,708 | $ 10,420
Gross Unrealized Losses Less than 12 months | (223) | (290)
Fair Value, 12 months or longer | 15,887 | 16,141
Gross Unrealized Losses, 12 months or longer | (3,240) | (3,485)
Total Fair Value | 28,595 | 26,561
Total Gross Unrealized Losses | $ (3,463) | $ (3,775)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security | 1,961 | 2,005
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security | 2,227 | 2,305
Total number of available-for-sale securities in an unrealized loss position | security | 4,188 | 4,310
Asset-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | $ 5,365 | $ 1,164
Gross Unrealized Losses Less than 12 months | (48) | (30)
Fair Value, 12 months or longer | 2,622 | 2,637
Gross Unrealized Losses, 12 months or longer | (263) | (276)
Total Fair Value | 7,987 | 3,801
Total Gross Unrealized Losses | (311) | (306)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 707 | 727
Gross Unrealized Losses Less than 12 months | (13) | (11)
Fair Value, 12 months or longer | 1,341 | 1,513
Gross Unrealized Losses, 12 months or longer | (141) | (175)
Total Fair Value | 2,048 | 2,240
Total Gross Unrealized Losses | (154) | (186)
Corporates |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 5,692 | 6,831
Gross Unrealized Losses Less than 12 months | (141) | (208)
Fair Value, 12 months or longer | 9,867 | 9,866
Gross Unrealized Losses, 12 months or longer | (2,471) | (2,624)
Total Fair Value | 15,559 | 16,697
Total Gross Unrealized Losses | (2,612) | (2,832)
Hybrids |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 100 | 105
Gross Unrealized Losses Less than 12 months | (5) | (4)
Fair Value, 12 months or longer | 306 | 380
Gross Unrealized Losses, 12 months or longer | (23) | (25)
Total Fair Value | 406 | 485
Total Gross Unrealized Losses | (28) | (29)
Municipals |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 179 | 261
Gross Unrealized Losses Less than 12 months | (9) | (12)
Fair Value, 12 months or longer | 1,025 | 1,006
Gross Unrealized Losses, 12 months or longer | (222) | (243)
Total Fair Value | 1,204 | 1,267
Total Gross Unrealized Losses | (231) | (255)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 495 | 899
Gross Unrealized Losses Less than 12 months | (4) | (16)
Fair Value, 12 months or longer | 440 | 460
Gross Unrealized Losses, 12 months or longer | (69) | (89)
Total Fair Value | 935 | 1,359
Total Gross Unrealized Losses | (73) | (105)
U.S. Government |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 80 | 313
Gross Unrealized Losses Less than 12 months | 0 | (4)
Fair Value, 12 months or longer | 104 | 122
Gross Unrealized Losses, 12 months or longer | (4) | (5)
Total Fair Value | 184 | 435
Total Gross Unrealized Losses | (4) | (9)
Foreign Governments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 90 | 120
Gross Unrealized Losses Less than 12 months | (3) | (5)
Fair Value, 12 months or longer | 182 | 157
Gross Unrealized Losses, 12 months or longer | (47) | (48)
Total Fair Value | 272 | 277
Total Gross Unrealized Losses | $ (50) | $ (53)

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