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Valuation of Debt and Equity Investments and Certain Liabilities - Investments at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | $ 1,502 | $ 1,656
Short-term investments | 3,611 | 2,813
Long-term investments | 278 | 268
Measured at fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 1,352 | 1,397
Short-term investments | 3,611 | 2,813
Long-term investments | 253 | 236
Measured at fair value | Available-for-sale debt securities | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 475 | 525
Short-term investments | 0 | 0
Long-term investments | 0 | 0
Measured at fair value | Available-for-sale debt securities | Corporate obligations |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 378 | 172
Short-term investments | 1,263 | 698
Long-term investments | 0 | 0
Measured at fair value | Available-for-sale debt securities | U.S. government agency and Treasury securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 499 | 700
Short-term investments | 2,348 | 2,115
Long-term investments | 0 | 0
Measured at fair value | Trading securities | Mutual funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 0
Long-term investments | 253 | 236
Other measurement basis | Equity-method investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 0
Long-term investments | 21 | 26
Other measurement basis | Non-marketable equity investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 0
Long-term investments | 4 | 6
Other measurement basis | Cash on hand |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 150 | 259
Short-term investments | 0 | 0
Long-term investments | $ 0 | $ 0

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- Definition 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. + References No definition available. + Details
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