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