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