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Derivatives - Cash Flow Hedges - Gain (Loss) in OCI or Reclassified from AOCI (Details) - Cash flow hedge - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivatives in Cash Flow Hedging Relationships    
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Derivative $ 66 $ 77
Pretax Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (9) 16
Foreign currency exchange contracts    
Derivatives in Cash Flow Hedging Relationships    
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Derivative 66 79
Foreign currency exchange contracts | Cost of sales    
Derivatives in Cash Flow Hedging Relationships    
Pretax Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income (7) 18
Interest rate contracts    
Derivatives in Cash Flow Hedging Relationships    
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Derivative   (2)
Interest rate contracts | Interest expense    
Derivatives in Cash Flow Hedging Relationships    
Pretax Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income $ (2) $ (2)