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Derivative instruments - (Fair Value of Derivatives) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets    
Total derivative assets, fair value $ 349 $ 549
Liabilities    
Total derivative liabilities, fair value 570 346
Derivatives designated as hedging instruments [Member]    
Assets    
Total derivative assets, fair value 349 548
Liabilities    
Total derivative liabilities, fair value 570 346
Derivatives designated as hedging instruments [Member] | Foreign currency contracts [Member] | Other current assets/Other assets [Member]    
Assets    
Total derivative assets, fair value 28 223
Derivatives designated as hedging instruments [Member] | Foreign currency contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member]    
Liabilities    
Total derivative liabilities, fair value 237 31
Derivatives designated as hedging instruments [Member] | Cross-currency swap contracts [Member] | Other current assets/Other assets [Member]    
Assets    
Total derivative assets, fair value 255 66
Derivatives designated as hedging instruments [Member] | Cross-currency swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member]    
Liabilities    
Total derivative liabilities, fair value 318 315
Derivatives designated as hedging instruments [Member] | Interest rate swap contracts [Member] | Other current assets/Other assets [Member]    
Assets    
Total derivative assets, fair value 66 259
Derivatives designated as hedging instruments [Member] | Interest rate swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member]    
Liabilities    
Total derivative liabilities, fair value 15 0
Derivatives not designated as hedging instruments [Member]    
Assets    
Total derivative assets, fair value 0 1
Liabilities    
Total derivative liabilities, fair value 0 0
Derivatives not designated as hedging instruments [Member] | Foreign currency contracts [Member] | Other current assets [Member]    
Assets    
Total derivative assets, fair value 0 1
Derivatives not designated as hedging instruments [Member] | Foreign currency contracts [Member] | Accrued liabilities [Member]    
Liabilities    
Total derivative liabilities, fair value $ 0 $ 0