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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details) $ in Millions | Jun. 30, 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 | $ 7,251 | $ 5,841
Gross Unrealized Losses Less than 12 months | (179) | (302)
Fair Value, 12 Months or longer | 20,226 | 20,908
Gross Unrealized Losses, 12 months or longer | (3,619) | (3,291)
Total Fair Value | 27,477 | 26,749
Total Gross Unrealized Losses | $ (3,798) | $ (3,593)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security | 1,578 | 1,035
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security | 2,807 | 2,846
Total number of available-for-sale securities in an unrealized loss position | security | 4,385 | 3,881
Asset-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | $ 1,322 | $ 1,707
Gross Unrealized Losses Less than 12 months | (33) | (56)
Fair Value, 12 Months or longer | 3,951 | 5,835
Gross Unrealized Losses, 12 months or longer | (317) | (404)
Total Fair Value | 5,273 | 7,542
Total Gross Unrealized Losses | (350) | (460)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 795 | 819
Gross Unrealized Losses Less than 12 months | (6) | (53)
Fair Value, 12 Months or longer | 2,065 | 1,922
Gross Unrealized Losses, 12 months or longer | (198) | (235)
Total Fair Value | 2,860 | 2,741
Total Gross Unrealized Losses | (204) | (288)
Corporates |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 4,080 | 2,387
Gross Unrealized Losses Less than 12 months | (85) | (134)
Fair Value, 12 Months or longer | 11,544 | 10,739
Gross Unrealized Losses, 12 months or longer | (2,695) | (2,283)
Total Fair Value | 15,624 | 13,126
Total Gross Unrealized Losses | (2,780) | (2,417)
Hybrids |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 73 | 60
Gross Unrealized Losses Less than 12 months | (2) | (2)
Fair Value, 12 Months or longer | 484 | 483
Gross Unrealized Losses, 12 months or longer | (42) | (51)
Total Fair Value | 557 | 543
Total Gross Unrealized Losses | (44) | (53)
Municipals |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 248 | 399
Gross Unrealized Losses Less than 12 months | (41) | (49)
Fair Value, 12 Months or longer | 999 | 920
Gross Unrealized Losses, 12 months or longer | (208) | (179)
Total Fair Value | 1,247 | 1,319
Total Gross Unrealized Losses | (249) | (228)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 448 | 336
Gross Unrealized Losses Less than 12 months | (6) | (5)
Fair Value, 12 Months or longer | 792 | 662
Gross Unrealized Losses, 12 months or longer | (103) | (89)
Total Fair Value | 1,240 | 998
Total Gross Unrealized Losses | (109) | (94)
U.S. Government |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 226 | 84
Gross Unrealized Losses Less than 12 months | (2) | 0
Fair Value, 12 Months or longer | 192 | 159
Gross Unrealized Losses, 12 months or longer | (9) | (9)
Total Fair Value | 418 | 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 | 59 | 49
Gross Unrealized Losses Less than 12 months | (4) | (3)
Fair Value, 12 Months or longer | 199 | 188
Gross Unrealized Losses, 12 months or longer | (47) | (41)
Total Fair Value | 258 | 237
Total Gross Unrealized Losses | $ (51) | $ (44)

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