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Investments - Schedule of Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details) $ in Millions | Sep. 30, 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 | $ 5,367 | $ 10,420
Gross Unrealized Losses Less than 12 months | (87) | (290)
Fair Value, 12 months or longer | 15,245 | 16,141
Gross Unrealized Losses, 12 months or longer | (2,875) | (3,485)
Total Fair Value | 20,612 | 26,561
Total Gross Unrealized Losses | $ (2,962) | $ (3,775)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security | 1,769 | 2,005
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security | 2,172 | 2,305
Total number of available-for-sale securities in an unrealized loss position | security | 3,941 | 4,310
Asset-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | $ 1,738 | $ 1,164
Gross Unrealized Losses Less than 12 months | (27) | (30)
Fair Value, 12 months or longer | 2,238 | 2,637
Gross Unrealized Losses, 12 months or longer | (208) | (276)
Total Fair Value | 3,976 | 3,801
Total Gross Unrealized Losses | (235) | (306)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 384 | 727
Gross Unrealized Losses Less than 12 months | (9) | (11)
Fair Value, 12 months or longer | 1,184 | 1,513
Gross Unrealized Losses, 12 months or longer | (126) | (175)
Total Fair Value | 1,568 | 2,240
Total Gross Unrealized Losses | (135) | (186)
Corporates |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 2,590 | 6,831
Gross Unrealized Losses Less than 12 months | (42) | (208)
Fair Value, 12 months or longer | 9,789 | 9,866
Gross Unrealized Losses, 12 months or longer | (2,215) | (2,624)
Total Fair Value | 12,379 | 16,697
Total Gross Unrealized Losses | (2,257) | (2,832)
Hybrids |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 71 | 105
Gross Unrealized Losses Less than 12 months | (2) | (4)
Fair Value, 12 months or longer | 339 | 380
Gross Unrealized Losses, 12 months or longer | (17) | (25)
Total Fair Value | 410 | 485
Total Gross Unrealized Losses | (19) | (29)
Municipals |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 159 | 261
Gross Unrealized Losses Less than 12 months | (4) | (12)
Fair Value, 12 months or longer | 1,055 | 1,006
Gross Unrealized Losses, 12 months or longer | (207) | (243)
Total Fair Value | 1,214 | 1,267
Total Gross Unrealized Losses | (211) | (255)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 169 | 899
Gross Unrealized Losses Less than 12 months | (1) | (16)
Fair Value, 12 months or longer | 391 | 460
Gross Unrealized Losses, 12 months or longer | (64) | (89)
Total Fair Value | 560 | 1,359
Total Gross Unrealized Losses | (65) | (105)
U.S. Government |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 207 | 313
Gross Unrealized Losses Less than 12 months | (1) | (4)
Fair Value, 12 months or longer | 93 | 122
Gross Unrealized Losses, 12 months or longer | (2) | (5)
Total Fair Value | 300 | 435
Total Gross Unrealized Losses | (3) | (9)
Foreign Governments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 49 | 120
Gross Unrealized Losses Less than 12 months | (1) | (5)
Fair Value, 12 months or longer | 156 | 157
Gross Unrealized Losses, 12 months or longer | (36) | (48)
Total Fair Value | 205 | 277
Total Gross Unrealized Losses | $ (37) | $ (53)

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