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Accumulated Other Comprehensive Loss - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Estimate of gains related to foreign currency exchange contracts during the next 12 months |  | $ 7 |  |  |
Payment from settlement of cash flow hedges, recorded in AOCL, net of tax | $ 183 | 1 | $ (8) |  |
Estimated interest expense related to settled interest rate hedge contracts during the next twelve months |  | 20 |  |  |
Foreign currency translation adjustment |  | 32 | $ 55 |  |
Foreign currency forward exchange contracts | Indian Rupee |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Notional amount of derivatives |  | 257 |  | $ 259 |
Total fair value of cash flow hedge derivatives |  | $ 8 |  | $ 9 |
Treasury Lock |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Derivative liability, notional amount |  |  |  |  | $ 5,000

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