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Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Details) $ in Millions | Jun. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | $ 24,385 | $ 11,443
Gross Unrealized Losses Less than 12 months | (2,935) | (185)
Fair Value, 12 Months or longer | 2,309 | 646
Gross Unrealized Losses, 12 months or longer | (637) | (40)
Total Fair Value | 26,694 | 12,089
Total Gross Unrealized Losses | $ (3,572) | $ (225)
Total number of available-for-sale securities in an unrealized loss position less than twelve months | security | 3,441 | 2,056
Total number of available-for-sale securities in an unrealized loss position twelve months or longer | security | 291 | 68
Total number of available-for-sale securities in an unrealized loss position | security | 3,732 | 2,124
Asset-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | $ 7,944 | $ 4,410
Gross Unrealized Losses Less than 12 months | (490) | (31)
Fair Value, 12 Months or longer | 645 | 146
Gross Unrealized Losses, 12 months or longer | (71) | (7)
Total Fair Value | 8,589 | 4,556
Total Gross Unrealized Losses | (561) | (38)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 1,788 | 603
Gross Unrealized Losses Less than 12 months | (153) | (11)
Fair Value, 12 Months or longer | 48 | 1
Gross Unrealized Losses, 12 months or longer | (8) | 0
Total Fair Value | 1,836 | 604
Total Gross Unrealized Losses | (161) | (11)
Corporates |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 11,593 | 5,391
Gross Unrealized Losses Less than 12 months | (1,960) | (132)
Fair Value, 12 Months or longer | 1,414 | 394
Gross Unrealized Losses, 12 months or longer | (521) | (26)
Total Fair Value | 13,007 | 5,785
Total Gross Unrealized Losses | (2,481) | (158)
Hybrids |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 677 | 3
Gross Unrealized Losses Less than 12 months | (64) | 0
Fair Value, 12 Months or longer | 2 | 0
Gross Unrealized Losses, 12 months or longer | 0 | 0
Total Fair Value | 679 | 3
Total Gross Unrealized Losses | (64) | 0
Municipals |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 1,120 | 410
Gross Unrealized Losses Less than 12 months | (158) | (5)
Fair Value, 12 Months or longer | 119 | 85
Gross Unrealized Losses, 12 months or longer | (23) | (6)
Total Fair Value | 1,239 | 495
Total Gross Unrealized Losses | (181) | (11)
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 798 | 325
Gross Unrealized Losses Less than 12 months | (67) | (3)
Fair Value, 12 Months or longer | 27 | 11
Gross Unrealized Losses, 12 months or longer | (6) | (1)
Total Fair Value | 825 | 336
Total Gross Unrealized Losses | (73) | (4)
U.S. Government |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 334 | 219
Gross Unrealized Losses Less than 12 months | (12) | (2)
Fair Value, 12 Months or longer | 34 | 4
Gross Unrealized Losses, 12 months or longer | (2) | 0
Total Fair Value | 368 | 223
Total Gross Unrealized Losses | (14) | (2)
Foreign Governments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Fair Values, Less than 12 months | 131 | 82
Gross Unrealized Losses Less than 12 months | (31) | (1)
Fair Value, 12 Months or longer | 20 | 5
Gross Unrealized Losses, 12 months or longer | (6) | 0
Total Fair Value | 151 | 87
Total Gross Unrealized Losses | $ (37) | $ (1)

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