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Valuation of debt and equity investments and certain liabilities - Investments at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and Cash Equivalents | $ 3,649 | $ 3,107
Short-Term Investments | 3,741 | 3,461
Long-Term Investments | 71 | 49
Measured at fair value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and Cash Equivalents | 2,849 | 2,482
Short-Term Investments | 3,741 | 3,461
Long-Term Investments | 15 | 18
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 | 2,039 | 886
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 | 460 | 256
Short-Term Investments | 979 | 407
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 | 350 | 1,340
Short-Term Investments | 2,762 | 3,054
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 | 15 | 18
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 | 52 | 27
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 | 800 | 625
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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