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Investments - Debt Securities (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | $ 22,838,000,000 | $ 22,174,000,000
Allowance for Credit Losses | (42,000,000) | 0
Net Amortized Cost | 22,796,000,000 | 22,174,000,000
Gross Unrealized Gains | 428,000,000 | 1,172,000,000
Gross Unrealized Losses | (726,000,000) | (106,000,000)
Fair Value | 22,498,000,000 | 23,240,000,000
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Allowance for Credit Losses | (4,000,000) | 0
Gross Unrealized Gains | 38,000,000 | 94,000,000
Gross Unrealized Losses | (13,000,000) | (2,000,000)
Fair Value | 775,000,000 | 864,000,000
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,333,000,000 | 2,349,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,333,000,000 | 2,349,000,000
Gross Unrealized Gains | 21,000,000 | 70,000,000
Gross Unrealized Losses | (68,000,000) | (3,000,000)
Fair Value | 2,286,000,000 | 2,416,000,000
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,526,000,000 | 2,947,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,526,000,000 | 2,947,000,000
Gross Unrealized Gains | 37,000,000 | 148,000,000
Gross Unrealized Losses | (65,000,000) | (4,000,000)
Fair Value | 2,498,000,000 | 3,091,000,000
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 10,005,000,000 | 9,093,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 10,005,000,000 | 9,093,000,000
Gross Unrealized Gains | 261,000,000 | 682,000,000
Gross Unrealized Losses | (322,000,000) | (40,000,000)
Fair Value | 9,944,000,000 | 9,735,000,000
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 3,049,000,000 | 2,821,000,000
Allowance for Credit Losses | (42,000,000) | 0
Net Amortized Cost | 3,007,000,000 | 2,821,000,000
Gross Unrealized Gains | 87,000,000 | 196,000,000
Gross Unrealized Losses | (95,000,000) | (24,000,000)
Fair Value | 2,999,000,000 | 2,993,000,000
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 910,000,000 | 870,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 910,000,000 | 870,000,000
Gross Unrealized Gains | 5,000,000 | 15,000,000
Gross Unrealized Losses | (48,000,000) | (10,000,000)
Fair Value | 867,000,000 | 875,000,000
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 1,284,000,000 | 1,278,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 1,284,000,000 | 1,278,000,000
Gross Unrealized Gains | 8,000,000 | 44,000,000
Gross Unrealized Losses | (67,000,000) | (12,000,000)
Fair Value | 1,225,000,000 | 1,310,000,000
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,706,000,000 | 2,791,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,706,000,000 | 2,791,000,000
Gross Unrealized Gains | 8,000,000 | 14,000,000
Gross Unrealized Losses | (61,000,000) | (13,000,000)
Fair Value | 2,653,000,000 | 2,792,000,000
Redeemable preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 25,000,000 | 25,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 25,000,000 | 25,000,000
Gross Unrealized Gains | 1,000,000 | 3,000,000
Gross Unrealized Losses | 0 | 0
Fair Value | $ 26,000,000 | $ 28,000,000

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