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Investments - Debt Securities (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 19,396,000,000 | $ 15,898,000,000
Gross Unrealized Gains | 1,803,000,000 | 1,035,000,000
Gross Unrealized Losses | (11,000,000) | (11,000,000)
Fair Value | 21,188,000,000 | 16,922,000,000
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,341,000,000 | 1,791,000,000
Gross Unrealized Gains | 128,000,000 | 62,000,000
Gross Unrealized Losses | 0 | (1,000,000)
Fair Value | 2,469,000,000 | 1,852,000,000
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,556,000,000 | 2,202,000,000
Gross Unrealized Gains | 172,000,000 | 108,000,000
Gross Unrealized Losses | 0 | (1,000,000)
Fair Value | 2,728,000,000 | 2,309,000,000
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,879,000,000 | 7,167,000,000
Gross Unrealized Gains | 1,023,000,000 | 573,000,000
Gross Unrealized Losses | (8,000,000) | (3,000,000)
Fair Value | 8,894,000,000 | 7,737,000,000
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,595,000,000 | 2,149,000,000
Gross Unrealized Gains | 324,000,000 | 200,000,000
Gross Unrealized Losses | (1,000,000) | (1,000,000)
Fair Value | 2,918,000,000 | 2,348,000,000
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 673,000,000 | 508,000,000
Gross Unrealized Gains | 32,000,000 | 25,000,000
Gross Unrealized Losses | 0 | 0
Fair Value | 705,000,000 | 533,000,000
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 962,000,000 | 654,000,000
Gross Unrealized Gains | 84,000,000 | 46,000,000
Gross Unrealized Losses | 0 | 0
Fair Value | 1,046,000,000 | 700,000,000
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,369,000,000 | 1,397,000,000
Gross Unrealized Gains | 36,000,000 | 13,000,000
Gross Unrealized Losses | (2,000,000) | (5,000,000)
Fair Value | 2,403,000,000 | 1,405,000,000
Redeemable preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 21,000,000 | 30,000,000
Gross Unrealized Gains | 4,000,000 | 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 | 135,000,000 | 83,000,000
Gross Unrealized Losses | 0 | 0
Fair Value | $ 919,000,000 | $ 965,000,000

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