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Accumulated Other Comprehensive Loss - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 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   $ 5   $ 5      
Payment from settlement of cash flow hedges, recorded in AOCL, net of tax $ 183 0 $ 3 1 $ (5)    
Estimated interest expense related to settled interest rate hedge contracts during the next twelve months   20   20      
Foreign currency translation adjustment   (26) $ (1) 6 $ 54    
Foreign currency forward exchange contracts | Indian Rupee              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Notional amount of derivatives   273   273   $ 259  
Total fair value of cash flow hedge derivatives   $ 5   $ 5   $ 9  
Treasury Lock              
Accumulated Other Comprehensive Income (Loss) [Line Items]              
Derivative liability, notional amount             $ 5,000