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Investments - Debt Securities (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | $ 18,863,000,000 | $ 15,898,000,000
Allowance for Credit Losses | (4,000,000) | 0
Net Amortized Cost | 18,859,000,000 | 15,898,000,000
Gross Unrealized Gains | 1,577,000,000 | 1,035,000,000
Gross Unrealized Losses | (38,000,000) | (11,000,000)
Fair Value | 20,398,000,000 | 16,922,000,000
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,455,000,000 | 1,791,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,455,000,000 | 1,791,000,000
Gross Unrealized Gains | 146,000,000 | 62,000,000
Gross Unrealized Losses | 0 | (1,000,000)
Fair Value | 2,601,000,000 | 1,852,000,000
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,393,000,000 | 2,202,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,393,000,000 | 2,202,000,000
Gross Unrealized Gains | 150,000,000 | 108,000,000
Gross Unrealized Losses | (3,000,000) | (1,000,000)
Fair Value | 2,540,000,000 | 2,309,000,000
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 7,665,000,000 | 7,167,000,000
Allowance for Credit Losses | (4,000,000) | 0
Net Amortized Cost | 7,661,000,000 | 7,167,000,000
Gross Unrealized Gains | 878,000,000 | 573,000,000
Gross Unrealized Losses | (15,000,000) | (3,000,000)
Fair Value | 8,524,000,000 | 7,737,000,000
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,479,000,000 | 2,149,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,479,000,000 | 2,149,000,000
Gross Unrealized Gains | 252,000,000 | 200,000,000
Gross Unrealized Losses | (10,000,000) | (1,000,000)
Fair Value | 2,721,000,000 | 2,348,000,000
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 680,000,000 | 508,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 680,000,000 | 508,000,000
Gross Unrealized Gains | 33,000,000 | 25,000,000
Gross Unrealized Losses | 0 | 0
Fair Value | 713,000,000 | 533,000,000
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 930,000,000 | 654,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 930,000,000 | 654,000,000
Gross Unrealized Gains | 82,000,000 | 46,000,000
Gross Unrealized Losses | 0 | 0
Fair Value | 1,012,000,000 | 700,000,000
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 2,239,000,000 | 1,397,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 2,239,000,000 | 1,397,000,000
Gross Unrealized Gains | 33,000,000 | 13,000,000
Gross Unrealized Losses | (10,000,000) | (5,000,000)
Fair Value | 2,262,000,000 | 1,405,000,000
Redeemable preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Amortized Cost | 22,000,000 | 30,000,000
Allowance for Credit Losses | 0 | 0
Net Amortized Cost | 22,000,000 | 30,000,000
Gross Unrealized Gains | 3,000,000 | 8,000,000
Gross Unrealized Losses | 0 | 0
Fair Value | 25,000,000 | 38,000,000
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Gains | 122,000,000 | 83,000,000
Gross Unrealized Losses | (1,000,000) | 0
Fair Value | $ 928,000,000 | $ 965,000,000

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