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v3.20.1

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-sale securities |  |
Debt Securities, Available-for-sale | $ 8 | $ 6
Available-for-sale investment securities | 163 | 351
Debt Securities, Held-to-maturity | 21 | 21
Marketable securities | 184 | 372
Bank Time Deposits [Member] |  |
Available-for-sale securities |  |
Available-for-sale investment securities | 115 | 325
Corporate Bond Securities [Member] |  |
Available-for-sale securities |  |
Debt Securities, Held-to-maturity | 21 | 21
Commercial Paper [Member] |  |
Available-for-sale securities |  |
Available-for-sale investment securities | $ 40 | $ 20

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- Definition Amount of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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