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Fair Value Measurements (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Derivative Asset |  | $ 90 | $ 55 | $ 266
Derivative Liability |  | 62 | 135 | 108
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets at Fair Value |  | 65 | 226 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 | US Treasury Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Debt Securities, Available-for-sale | [1] | 65 | 226 |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Assets at Fair Value |  | 139 | 98 | 276
Liabilities at Fair Value |  | 62 | 135 | 108
Marketable Securities |  | 49 | 43 | 10
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Currency Contract [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |
Derivative Asset | [2] | 90 | 55 | 266
Derivative Liability | [2] | $ 62 | $ 135 | $ 108
[1] | The company's investments in debt securities, which are available-for-sale, are included in "marketable securities" in the interim Condensed Consolidated Balance Sheets
[2] | See Note 16 - Financial Instruments for the classification of derivatives in the interim Condensed Consolidated Balance Sheets.

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