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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]        
Foreign currency contracts $ 2,179 $ 717 $ 3,890 $ 1,498
Interest Expense (77) (32) (142) (64)
Tax $ 14 $ 16 0 42
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     (5) 4
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     3 (9)
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     (15) 0
Accumulated Defined Benefit Plans Adjustment        
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]        
Tax     1 2
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     (4) 3
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment        
Schedule Of Reclassification Of Accumulated Other Comprehensive Income Loss [Line Items]        
Total     $ (11) $ (7)