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Accumulated Other Comprehensive Loss - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Estimate of gain related to foreign currency exchange contracts during the next 12 months |  | $ 5 |  |  |  |
Fair market value adjustment on cash flow hedges, net of income tax benefit | $ 183 | 6 | $ 5 | $ (134) |  |
Estimated interest expense related to settled interest rate hedge contracts during the next twelve months |  | 19 |  |  |  |
Foreign currency translation adjustment |  | 110 | (151) | (62) |  |
Foreign currency translation adjustment, tax |  | 36 |  |  |  |
Prior period reclassification adjustment |  | 31,672 | 33,070 | 34,595 |  | $ 2,293
Revision of Prior Period, Reclassification, Adjustment |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Prior period reclassification adjustment |  | 0 |  |  |  |
Retained Earnings |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Prior period reclassification adjustment |  | 14,846 | 13,441 | $ 12,528 |  | $ 11,635
Retained Earnings | Revision of Prior Period, Reclassification, Adjustment |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Prior period reclassification adjustment |  | 71 |  |  |  |
Foreign currency forward exchange contracts | Indian Rupee |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Notional amount of derivatives |  | 341 | 259 |  |  |
Total fair value of cash flow hedge derivatives |  | $ 6 | $ 9 |  |  |
Treasury Lock |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Derivative liability, notional amount |  |  |  |  | $ 5,000 |

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