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Investments - Schedule of Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details) $ in Millions | Sep. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | $ 2,782 | $ 5,841
Gross Unrealized Losses Less than 12 months | (40) | (302)
Fair Value, 12 months or longer | 18,056 | 20,908
Gross Unrealized Losses, 12 months or longer | (2,802) | (3,291)
Total Fair Value | 20,838 | 26,749
Total Gross Unrealized Losses | $ (2,842) | $ (3,593)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security | 585 | 1,035
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security | 2,393 | 2,846
Total number of available-for-sale securities in an unrealized loss position | security | 2,978 | 3,881
Asset-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | $ 583 | $ 1,707
Gross Unrealized Losses Less than 12 months | (19) | (56)
Fair Value, 12 months or longer | 3,447 | 5,835
Gross Unrealized Losses, 12 months or longer | (237) | (404)
Total Fair Value | 4,030 | 7,542
Total Gross Unrealized Losses | (256) | (460)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 209 | 819
Gross Unrealized Losses Less than 12 months | (5) | (53)
Fair Value, 12 months or longer | 1,682 | 1,922
Gross Unrealized Losses, 12 months or longer | (168) | (235)
Total Fair Value | 1,891 | 2,741
Total Gross Unrealized Losses | (173) | (288)
Corporates |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 1,382 | 2,387
Gross Unrealized Losses Less than 12 months | (8) | (134)
Fair Value, 12 months or longer | 10,698 | 10,739
Gross Unrealized Losses, 12 months or longer | (2,084) | (2,283)
Total Fair Value | 12,080 | 13,126
Total Gross Unrealized Losses | (2,092) | (2,417)
Hybrids |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 47 | 60
Gross Unrealized Losses Less than 12 months | (1) | (2)
Fair Value, 12 months or longer | 393 | 483
Gross Unrealized Losses, 12 months or longer | (18) | (51)
Total Fair Value | 440 | 543
Total Gross Unrealized Losses | (19) | (53)
Municipals |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 82 | 399
Gross Unrealized Losses Less than 12 months | (1) | (49)
Fair Value, 12 months or longer | 1,089 | 920
Gross Unrealized Losses, 12 months or longer | (186) | (179)
Total Fair Value | 1,171 | 1,319
Total Gross Unrealized Losses | (187) | (228)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 188 | 336
Gross Unrealized Losses Less than 12 months | (3) | (5)
Fair Value, 12 months or longer | 447 | 662
Gross Unrealized Losses, 12 months or longer | (68) | (89)
Total Fair Value | 635 | 998
Total Gross Unrealized Losses | (71) | (94)
U.S. Government |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 268 | 84
Gross Unrealized Losses Less than 12 months | (1) | 0
Fair Value, 12 months or longer | 130 | 159
Gross Unrealized Losses, 12 months or longer | (5) | (9)
Total Fair Value | 398 | 243
Total Gross Unrealized Losses | (6) | (9)
Foreign Governments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Value, Less than 12 months | 23 | 49
Gross Unrealized Losses Less than 12 months | (2) | (3)
Fair Value, 12 months or longer | 170 | 188
Gross Unrealized Losses, 12 months or longer | (36) | (41)
Total Fair Value | 193 | 237
Total Gross Unrealized Losses | $ (38) | $ (44)

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