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Investments - Debt and Equity Securities (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 15,588,000,000 | $ 15,119,000,000
Available-for-sale Securities, Gross Unrealized Loss | 888,000,000 | 172,000,000
Available-for-sale Securities, Gross Unrealized Gain | 7,000,000 | 36,000,000
Fair Value | 16,469,000,000 | 15,255,000,000
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,675,000,000 | 1,662,000,000
Available-for-sale Securities, Gross Unrealized Loss | 66,000,000 | 26,000,000
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Fair Value | 1,741,000,000 | 1,688,000,000
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,363,000,000 | 2,370,000,000
Available-for-sale Securities, Gross Unrealized Loss | 103,000,000 | 30,000,000
Available-for-sale Securities, Gross Unrealized Gain | 0 | 1,000,000
Fair Value | 2,466,000,000 | 2,399,000,000
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,929,000,000 | 6,444,000,000
Available-for-sale Securities, Gross Unrealized Loss | 465,000,000 | 61,000,000
Available-for-sale Securities, Gross Unrealized Gain | 2,000,000 | 16,000,000
Fair Value | 7,392,000,000 | 6,489,000,000
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,188,000,000 | 2,355,000,000
Available-for-sale Securities, Gross Unrealized Loss | 165,000,000 | 31,000,000
Available-for-sale Securities, Gross Unrealized Gain | 1,000,000 | 3,000,000
Fair Value | 2,352,000,000 | 2,383,000,000
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 542,000,000 | 567,000,000
Available-for-sale Securities, Gross Unrealized Loss | 22,000,000 | 10,000,000
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Fair Value | 564,000,000 | 577,000,000
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 612,000,000 | 594,000,000
Available-for-sale Securities, Gross Unrealized Loss | 46,000,000 | 11,000,000
Available-for-sale Securities, Gross Unrealized Gain | 0 | 0
Fair Value | 658,000,000 | 605,000,000
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,247,000,000 | 1,097,000,000
Available-for-sale Securities, Gross Unrealized Loss | 14,000,000 | 3,000,000
Available-for-sale Securities, Gross Unrealized Gain | 4,000,000 | 15,000,000
Fair Value | 1,257,000,000 | 1,085,000,000
Redeemable preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 32,000,000 | 30,000,000
Available-for-sale Securities, Gross Unrealized Loss | 7,000,000 | 0
Available-for-sale Securities, Gross Unrealized Gain | 0 | 1,000,000
Fair Value | 39,000,000 | 29,000,000
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Gross Unrealized Loss | 0 | 2,000,000
Available-for-sale Securities, Gross Unrealized Gain | 70,000,000 | 12,000,000
Fair Value | $ 944,000,000 | $ 916,000,000

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