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Investments - Summary of Investments (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,751 | $ 1,692
Gross Unrealized Gains | 7 | 0
Gross Unrealized Losses | 1 | 11
Estimated Fair Value | 1,757 | 1,681
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,125 | 1,131
Gross Unrealized Gains | 5 | 0
Gross Unrealized Losses | 1 | 8
Estimated Fair Value | 1,129 | 1,123
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 302 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 303 |
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 109 | 83
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 0 | 1
Estimated Fair Value | 110 | 82
GSEs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 97 | 164
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 1
Estimated Fair Value | 97 | 163
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 68 | 115
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 1
Estimated Fair Value | 68 | 114
U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 40 | 181
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 40 | 181
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 7 | 4
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 7 | 4
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3 | 14
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 3 | $ 14

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