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Fair Value Measurement of Assets and Liabilities - Financial Assets and Liabilities Measured at Fair Value, Recurring (Details) - Recurring - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Cash and cash equivalents | $ 963 | $ 901
Total financial assets | 4,887 | 4,057
Short-term investments |  |
Assets: |  |
Investments | 2,697 | 1,850
Derivatives |  |
Assets: |  |
Derivatives | 836 | 345
Long-term Investments |  |
Assets: |  |
Investments | 391 | 961
Derivatives |  |
Liabilities: |  |
Derivatives | 29 | 20
Restricted cash | Short-term investments |  |
Assets: |  |
Investments | 126 | 21
Corporate debt securities | Short-term investments |  |
Assets: |  |
Investments | 2,571 | 1,654
Corporate debt securities | Long-term Investments |  |
Assets: |  |
Investments | 391 | 961
Government and agency securities | Short-term investments |  |
Assets: |  |
Investments |  | 175
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 933 | 901
Total financial assets | 1,059 | 922
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments |  |
Assets: |  |
Investments | 126 | 21
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives |  |
Assets: |  |
Derivatives | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Long-term Investments |  |
Assets: |  |
Investments | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivatives |  |
Liabilities: |  |
Derivatives | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Restricted cash | Short-term investments |  |
Assets: |  |
Investments | 126 | 21
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Short-term investments |  |
Assets: |  |
Investments | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Long-term Investments |  |
Assets: |  |
Investments | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Government and agency securities | Short-term investments |  |
Assets: |  |
Investments |  | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash and cash equivalents | 30 | 0
Total financial assets | 3,051 | 2,854
Significant Other Observable Inputs (Level 2) | Short-term investments |  |
Assets: |  |
Investments | 2,571 | 1,829
Significant Other Observable Inputs (Level 2) | Derivatives |  |
Assets: |  |
Derivatives | 59 | 64
Significant Other Observable Inputs (Level 2) | Long-term Investments |  |
Assets: |  |
Investments | 391 | 961
Significant Other Observable Inputs (Level 2) | Derivatives |  |
Liabilities: |  |
Derivatives | 29 | 20
Significant Other Observable Inputs (Level 2) | Restricted cash | Short-term investments |  |
Assets: |  |
Investments | 0 | 0
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Short-term investments |  |
Assets: |  |
Investments | 2,571 | 1,654
Significant Other Observable Inputs (Level 2) | Corporate debt securities | Long-term Investments |  |
Assets: |  |
Investments | 391 | 961
Significant Other Observable Inputs (Level 2) | Government and agency securities | Short-term investments |  |
Assets: |  |
Investments |  | 175
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Total financial assets | 777 | 281
Significant Unobservable Inputs (Level 3) | Short-term investments |  |
Assets: |  |
Investments | 0 | 0
Significant Unobservable Inputs (Level 3) | Derivatives |  |
Assets: |  |
Derivatives | 777 | 281
Significant Unobservable Inputs (Level 3) | Long-term Investments |  |
Assets: |  |
Investments | 0 | 0
Significant Unobservable Inputs (Level 3) | Derivatives |  |
Liabilities: |  |
Derivatives | 0 | 0
Significant Unobservable Inputs (Level 3) | Restricted cash | Short-term investments |  |
Assets: |  |
Investments | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Short-term investments |  |
Assets: |  |
Investments | 0 | 0
Significant Unobservable Inputs (Level 3) | Corporate debt securities | Long-term Investments |  |
Assets: |  |
Investments | $ 0 | 0
Significant Unobservable Inputs (Level 3) | Government and agency securities | Short-term investments |  |
Assets: |  |
Investments |  | $ 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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