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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss)	$ 0	$ 0	$ 0	$ 0
Available-for-sale securities
Debt Securities, Available-for-sale	8		8		$ 6
Available-for-sale investment securities	322		322		351
Debt Securities, Held-to-maturity	21		21		21
Marketable securities	343		343		372
Bank Time Deposits [Member]
Available-for-sale securities
Available-for-sale investment securities	294		294		325
Corporate Bond Securities [Member]
Available-for-sale securities
Debt Securities, Held-to-maturity	21		21		21
Commercial Paper [Member]
Available-for-sale securities
Available-for-sale investment securities	$ 20		$ 20		$ 20

X

- Definition

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

+ References

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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 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of gain (loss) on sale of investment in debt security measured at amortized cost (held-to-maturity), including other-than-temporary impairment (OTTI).

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Amount of investment in marketable security.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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