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Accumulated Other Comprehensive Income (Loss) - Reclassifications of Accumulated Other Comprehensive Income to Consolidated Statement of Comprehensive Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]        
Foreign currency contracts $ 1,981 $ 744 $ 5,871 $ 2,242
Interest Expense (74) (35) (216) (99)
Tax $ 53 $ 19 53 61
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges        
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]        
Tax     (1) 1
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     (6) 5
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     5 (13)
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     (27) 0
Accumulated Defined Benefit Plans Adjustment        
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]        
Tax     1 3
Accumulated Defined Benefit Plans Adjustment, Other Items Attributable To Parent        
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     17 0
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     (5) 4
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment        
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]        
Total     $ (4) $ (10)