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Investments - Amortized Cost, Gross Unrealized Gains and Losses, Fair Values of Investments (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Debt Securities |  |
Amortized Cost | $ 452 | $ 341
Gross Unrealized Gains | 8 | 1
Gross Unrealized Losses | 0 | 0
Fair Value | 460 | 342
Asset-backed securities |  |
Debt Securities |  |
Amortized Cost | 22 | 30
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 22 | 30
Corporate bonds |  |
Debt Securities |  |
Amortized Cost | 118 | 123
Gross Unrealized Gains | 3 | 1
Gross Unrealized Losses | 0 | 0
Fair Value | 121 | 124
U.S. government agencies and government- sponsored agencies |  |
Debt Securities |  |
Amortized Cost | 20 | 14
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 20 | 14
U.S. treasuries |  |
Debt Securities |  |
Amortized Cost | 285 | 163
Gross Unrealized Gains | 5 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 290 | 163
Certificate of deposits |  |
Debt Securities |  |
Amortized Cost | 0 | 1
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 0 | 1
Other debt securities |  |
Debt Securities |  |
Amortized Cost | 7 | 10
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 7 | $ 10

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