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Investments - Schedule of Investments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,941 | $ 1,692
Gross Unrealized Gains | 7 | 0
Gross Unrealized Losses | 2 | 11
Estimated Fair Value | 1,946 | 1,681
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,174 | 1,131
Gross Unrealized Gains | 5 | 0
Gross Unrealized Losses | 1 | 8
Estimated Fair Value | 1,178 | 1,123
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 420 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | 1 |
Estimated Fair Value | 420 |
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 126 | 83
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 0 | 1
Estimated Fair Value | 127 | 82
U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 86 | 181
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 86 | 181
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 78 | 115
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 1
Estimated Fair Value | 78 | 114
GSEs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49 | 164
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 1
Estimated Fair Value | 49 | 163
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 | 1 | 14
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 1 | $ 14

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