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Derivatives - Statement of Income Location and Impact of Cash Flow (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cost of sales      
Derivatives in Fair Value Hedging Relationships      
Total amounts of income and expense line items presented in the consolidated statement of income in which the effects of cash flow or fair value hedges are recorded $ 17,136    
Other expense (income), net      
Derivatives in Fair Value Hedging Relationships      
Total amounts of income and expense line items presented in the consolidated statement of income in which the effects of cash flow or fair value hedges are recorded 462    
Cash flow hedge      
Gain or (loss) on cash flow hedging relationships:      
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income 70    
Cash flow hedge | Foreign currency forward/option contracts | Cost of sales      
Gain or (loss) on cash flow hedging relationships:      
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income 74    
Cash flow hedge | Interest rate swap contracts | Other expense (income), net      
Gain or (loss) on cash flow hedging relationships:      
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income (4)    
Fair value hedges      
Gain or (loss) on fair value hedging relationships:      
Hedged items   $ (5) $ (9)
Fair value hedges | Interest rate swap contracts | Other expense (income), net      
Gain or (loss) on fair value hedging relationships:      
Hedged items (8)    
Derivatives designated as hedging instruments $ 8