Fair Value Measurement of Assets and Liabilities - Financial Assets and Liabilities Measured at Fair Value, Recurring (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Assets:
Derivatives	$ 73
Liabilities:
Derivatives	0
Recurring
Assets:
Cash and cash equivalents	2,086	$ 2,120
Derivatives		28
Total financial assets	9,333	11,337
Recurring \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	2,752	3,743
Recurring \| Other Current Assets
Assets:
Derivatives	363
Recurring \| Long-term Investments
Assets:
Investments, Fair Value Disclosure	4,132	5,446
Recurring \| Other Current Liabilities
Liabilities:
Derivatives	55	29
Recurring \| Restricted cash \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	15	20
Recurring \| Corporate debt securities \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	2,696	3,723
Recurring \| Corporate debt securities \| Long-term Investments
Assets:
Investments, Fair Value Disclosure	4,132	5,446
Recurring \| Government and agency securities \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	41
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Cash and cash equivalents	2,051	2,120
Derivatives		0
Total financial assets	2,066	2,140
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	15	20
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Other Current Assets
Assets:
Derivatives	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Long-term Investments
Assets:
Investments, Fair Value Disclosure	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Other Current Liabilities
Liabilities:
Derivatives	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Restricted cash \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	15	20
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Corporate debt securities \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Corporate debt securities \| Long-term Investments
Assets:
Investments, Fair Value Disclosure	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Government and agency securities \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	0
Recurring \| Significant Other Observable Inputs (Level 2)
Assets:
Cash and cash equivalents	35	0
Derivatives		28
Total financial assets	6,991	9,197
Recurring \| Significant Other Observable Inputs (Level 2) \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	2,737	3,723
Recurring \| Significant Other Observable Inputs (Level 2) \| Other Current Assets
Assets:
Derivatives	87
Recurring \| Significant Other Observable Inputs (Level 2) \| Long-term Investments
Assets:
Investments, Fair Value Disclosure	4,132	5,446
Recurring \| Significant Other Observable Inputs (Level 2) \| Other Current Liabilities
Liabilities:
Derivatives	55	29
Recurring \| Significant Other Observable Inputs (Level 2) \| Restricted cash \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	0	0
Recurring \| Significant Other Observable Inputs (Level 2) \| Corporate debt securities \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	2,696	3,723
Recurring \| Significant Other Observable Inputs (Level 2) \| Corporate debt securities \| Long-term Investments
Assets:
Investments, Fair Value Disclosure	4,132	$ 5,446
Recurring \| Significant Other Observable Inputs (Level 2) \| Government and agency securities \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	41
Recurring \| Significant Unobservable Inputs (Level 3)
Assets:
Cash and cash equivalents	0
Total financial assets	276
Recurring \| Significant Unobservable Inputs (Level 3) \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Other Current Assets
Assets:
Derivatives	276
Recurring \| Significant Unobservable Inputs (Level 3) \| Long-term Investments
Assets:
Investments, Fair Value Disclosure	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Other Current Liabilities
Liabilities:
Derivatives	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Restricted cash \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Corporate debt securities \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Corporate debt securities \| Long-term Investments
Assets:
Investments, Fair Value Disclosure	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Government and agency securities \| Short-term Investments
Assets:
Investments, Fair Value Disclosure	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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