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Accumulated Other Comprehensive Loss - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 24, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Estimate of gain related to foreign currency exchange contracts during the next 12 months |  | $ 8 |  |  |
Fair market value adjustment on cash flow hedges, net of income tax benefit | $ 183 | 5 | $ (134) | $ (5) |
Estimated interest expense related to settled interest rate hedge contracts during the next twelve months |  | 20 |  |  |
Foreign currency translation adjustment |  | 151 | 62 |  |
Foreign currency forward exchange contracts | Indian Rupee |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Notional amount of derivatives |  | 259 | 178 |  |
Total fair value of cash flow hedge derivatives |  | $ 9 | $ 4 |  |
Treasury Lock |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Derivative liability, notional amount |  |  |  |  | $ 5,000

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