Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Income to Consolidated Statement of Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Foreign currency contracts	$ 1,711	$ 781
Interest Expense	(65)	(32)
Tax	(14)	26
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Tax	(1)	0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges | Foreign currency contracts
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Foreign currency contracts	(3)	2
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	2	(5)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(8)	0
Accumulated Defined Benefit Plans Adjustment
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Tax	(1)	1
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Total	(2)	2
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]
Total	$ (7)	$ (4)