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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