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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details) $ in Millions | Mar. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | $ 6,970 | $ 5,841
Gross Unrealized Losses Less than 12 months | (251) | (302)
Fair Value, 12 Months or longer | 20,098 | 20,908
Gross Unrealized Losses, 12 months or longer | (3,386) | (3,291)
Total Fair Value | 27,068 | 26,749
Total Gross Unrealized Losses | $ (3,637) | $ (3,593)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security | 1,371 | 1,035
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security | 2,775 | 2,846
Total number of available-for-sale securities in an unrealized loss position | security | 4,146 | 3,881
Asset-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | $ 1,558 | $ 1,707
Gross Unrealized Losses Less than 12 months | (41) | (56)
Fair Value, 12 Months or longer | 4,568 | 5,835
Gross Unrealized Losses, 12 months or longer | (358) | (404)
Total Fair Value | 6,126 | 7,542
Total Gross Unrealized Losses | (399) | (460)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 470 | 819
Gross Unrealized Losses Less than 12 months | (8) | (53)
Fair Value, 12 Months or longer | 2,048 | 1,922
Gross Unrealized Losses, 12 months or longer | (203) | (235)
Total Fair Value | 2,518 | 2,741
Total Gross Unrealized Losses | (211) | (288)
Corporates |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 3,645 | 2,387
Gross Unrealized Losses Less than 12 months | (136) | (134)
Fair Value, 12 Months or longer | 11,062 | 10,739
Gross Unrealized Losses, 12 months or longer | (2,449) | (2,283)
Total Fair Value | 14,707 | 13,126
Total Gross Unrealized Losses | (2,585) | (2,417)
Hybrids |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 71 | 60
Gross Unrealized Losses Less than 12 months | (2) | (2)
Fair Value, 12 Months or longer | 464 | 483
Gross Unrealized Losses, 12 months or longer | (36) | (51)
Total Fair Value | 535 | 543
Total Gross Unrealized Losses | (38) | (53)
Municipals |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 340 | 399
Gross Unrealized Losses Less than 12 months | (51) | (49)
Fair Value, 12 Months or longer | 935 | 920
Gross Unrealized Losses, 12 months or longer | (186) | (179)
Total Fair Value | 1,275 | 1,319
Total Gross Unrealized Losses | (237) | (228)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 507 | 336
Gross Unrealized Losses Less than 12 months | (9) | (5)
Fair Value, 12 Months or longer | 687 | 662
Gross Unrealized Losses, 12 months or longer | (99) | (89)
Total Fair Value | 1,194 | 998
Total Gross Unrealized Losses | (108) | (94)
U.S. Government |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 337 | 84
Gross Unrealized Losses Less than 12 months | (2) | 0
Fair Value, 12 Months or longer | 147 | 159
Gross Unrealized Losses, 12 months or longer | (9) | (9)
Total Fair Value | 484 | 243
Total Gross Unrealized Losses | (11) | (9)
Foreign Governments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 42 | 49
Gross Unrealized Losses Less than 12 months | (2) | (3)
Fair Value, 12 Months or longer | 187 | 188
Gross Unrealized Losses, 12 months or longer | (46) | (41)
Total Fair Value | 229 | 237
Total Gross Unrealized Losses | $ (48) | $ (44)

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