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Valuation of Debt and Equity Investments and Certain Liabilities - Investments at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | $ 3,720 | $ 2,438
Short-term investments | 366 | 1,795
Long-term investments | 281 | 251
Measured at fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 3,435 | 2,208
Short-term investments | 366 | 1,795
Long-term investments | 250 | 226
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 | 1,073 | 747
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 | 865 | 473
Short-term investments | 266 | 748
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 | 1,497 | 988
Short-term investments | 100 | 1,047
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 | 250 | 226
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 | 27 | 21
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 | 4
Other measurement basis | Cash on hand |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and cash equivalents | 285 | 230
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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