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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details) $ in Millions | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | $ 5,841 | $ 21,860
Gross Unrealized Losses Less than 12 months | (302) | (2,667)
Fair Value, 12 Months or longer | 20,908 | 8,463
Gross Unrealized Losses, 12 months or longer | (3,291) | (1,964)
Total Fair Value | 26,749 | 30,323
Total Gross Unrealized Losses | $ (3,593) | $ (4,631)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security | 1,035 | 3,114
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security | 2,846 | 1,296
Total number of available-for-sale securities in an unrealized loss position | security | 3,881 | 4,410
Asset-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | $ 1,707 | $ 7,001
Gross Unrealized Losses Less than 12 months | (56) | (410)
Fair Value, 12 Months or longer | 5,835 | 3,727
Gross Unrealized Losses, 12 months or longer | (404) | (360)
Total Fair Value | 7,542 | 10,728
Total Gross Unrealized Losses | (460) | (770)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 819 | 2,079
Gross Unrealized Losses Less than 12 months | (53) | (169)
Fair Value, 12 Months or longer | 1,922 | 475
Gross Unrealized Losses, 12 months or longer | (235) | (116)
Total Fair Value | 2,741 | 2,554
Total Gross Unrealized Losses | (288) | (285)
Corporates |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 2,387 | 9,913
Gross Unrealized Losses Less than 12 months | (134) | (1,735)
Fair Value, 12 Months or longer | 10,739 | 3,523
Gross Unrealized Losses, 12 months or longer | (2,283) | (1,330)
Total Fair Value | 13,126 | 13,436
Total Gross Unrealized Losses | (2,417) | (3,065)
Hybrids |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 60 | 628
Gross Unrealized Losses Less than 12 months | (2) | (83)
Fair Value, 12 Months or longer | 483 | 3
Gross Unrealized Losses, 12 months or longer | (51) | (1)
Total Fair Value | 543 | 631
Total Gross Unrealized Losses | (53) | (84)
Municipals |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 399 | 998
Gross Unrealized Losses Less than 12 months | (49) | (180)
Fair Value, 12 Months or longer | 920 | 352
Gross Unrealized Losses, 12 months or longer | (179) | (113)
Total Fair Value | 1,319 | 1,350
Total Gross Unrealized Losses | (228) | (293)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 336 | 992
Gross Unrealized Losses Less than 12 months | (5) | (51)
Fair Value, 12 Months or longer | 662 | 184
Gross Unrealized Losses, 12 months or longer | (89) | (22)
Total Fair Value | 998 | 1,176
Total Gross Unrealized Losses | (94) | (73)
U.S. Government |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 84 | 130
Gross Unrealized Losses Less than 12 months | 0 | (7)
Fair Value, 12 Months or longer | 159 | 140
Gross Unrealized Losses, 12 months or longer | (9) | (8)
Total Fair Value | 243 | 270
Total Gross Unrealized Losses | (9) | (15)
Foreign Governments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 49 | 119
Gross Unrealized Losses Less than 12 months | (3) | (32)
Fair Value, 12 Months or longer | 188 | 59
Gross Unrealized Losses, 12 months or longer | (41) | (14)
Total Fair Value | 237 | 178
Total Gross Unrealized Losses | $ (44) | $ (46)

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