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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

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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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
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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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-Topic 320
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Amount of investment in marketable security.

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