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Investments - Amortized Cost, Gross Unrealized Gains and Losses, Fair Values of Investments (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities |  |
Amortized Cost | $ 428 | $ 341
Gross Unrealized Gains | 7 | 1
Gross Unrealized Losses | (1) | 0
Fair Value | 434 | 342
Asset-backed securities |  |
Debt Securities |  |
Amortized Cost | 30 | 30
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 30 | 30
Corporate bonds |  |
Debt Securities |  |
Amortized Cost | 126 | 123
Gross Unrealized Gains | 1 | 1
Gross Unrealized Losses | (1) | 0
Fair Value | 126 | 124
U.S. government agencies and government- sponsored agencies |  |
Debt Securities |  |
Amortized Cost | 24 | 14
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 25 | 14
U.S. treasuries |  |
Debt Securities |  |
Amortized Cost | 239 | 163
Gross Unrealized Gains | 5 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 244 | 163
Certificate of deposits |  |
Debt Securities |  |
Amortized Cost | 1 | 1
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 1 | 1
Other debt securities |  |
Debt Securities |  |
Amortized Cost | 8 | 10
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 8 | $ 10

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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