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Investments - Debt Securities (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 15,708,000,000 | $ 15,119,000,000
Gross Unrealized Gains | 1,063,000,000 | 172,000,000
Gross Unrealized Losses | (13,000,000) | (36,000,000)
Fair Value | 16,758,000,000 | 15,255,000,000
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,743,000,000 | 1,662,000,000
Gross Unrealized Gains | 83,000,000 | 26,000,000
Gross Unrealized Losses | 0 | 0
Fair Value | 1,826,000,000 | 1,688,000,000
States, municipalities and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,240,000,000 | 2,370,000,000
Gross Unrealized Gains | 114,000,000 | 30,000,000
Gross Unrealized Losses | (1,000,000) | (1,000,000)
Fair Value | 2,353,000,000 | 2,399,000,000
U.S. corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7,076,000,000 | 6,444,000,000
Gross Unrealized Gains | 568,000,000 | 61,000,000
Gross Unrealized Losses | (7,000,000) | (16,000,000)
Fair Value | 7,637,000,000 | 6,489,000,000
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,095,000,000 | 2,355,000,000
Gross Unrealized Gains | 194,000,000 | 31,000,000
Gross Unrealized Losses | 0 | (3,000,000)
Fair Value | 2,289,000,000 | 2,383,000,000
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 529,000,000 | 567,000,000
Gross Unrealized Gains | 25,000,000 | 10,000,000
Gross Unrealized Losses | 0 | 0
Fair Value | 554,000,000 | 577,000,000
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 645,000,000 | 594,000,000
Gross Unrealized Gains | 56,000,000 | 11,000,000
Gross Unrealized Losses | 0 | 0
Fair Value | 701,000,000 | 605,000,000
Other asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,348,000,000 | 1,097,000,000
Gross Unrealized Gains | 15,000,000 | 3,000,000
Gross Unrealized Losses | (5,000,000) | (15,000,000)
Fair Value | 1,358,000,000 | 1,085,000,000
Redeemable preferred securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 32,000,000 | 30,000,000
Gross Unrealized Gains | 8,000,000 | 0
Gross Unrealized Losses | 0 | (1,000,000)
Fair Value | 40,000,000 | 29,000,000
Supporting experience-rated products |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Gains | 85,000,000 | 12,000,000
Gross Unrealized Losses | 0 | (2,000,000)
Fair Value | $ 973,000,000 | $ 916,000,000

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