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Derivative instruments (Fair Value of Derivatives) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Assets    
Total derivative assets, fair value $ 223 $ 244
Liabilities    
Total derivative liabilities, fair value 491 534
Derivatives designated as hedging instrument [Member]    
Assets    
Total derivative assets, fair value 223 244
Liabilities    
Total derivative liabilities, fair value 491 534
Derivatives designated as hedging instrument [Member] | Foreign currency contracts [Member] | Other current assets/Other noncurrent assets [Member]    
Assets    
Total derivative assets, fair value 18 203
Derivatives designated as hedging instrument [Member] | Foreign currency contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member]    
Liabilities    
Total derivative liabilities, fair value 93 4
Derivatives designated as hedging instrument [Member] | Cross currency swap contracts [Member] | Other current assets/Other noncurrent assets [Member]    
Assets    
Total derivative assets, fair value 153 0
Derivatives designated as hedging instrument [Member] | Cross currency swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member]    
Liabilities    
Total derivative liabilities, fair value 398 523
Derivatives designated as hedging instrument [Member] | Interest rate swap contracts [Member] | Other current assets/Other noncurrent assets [Member]    
Assets    
Total derivative assets, fair value 52 41
Derivatives designated as hedging instrument [Member] | Interest rate swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member]    
Liabilities    
Total derivative liabilities, fair value 0 7
Derivatives not designated as hedging instrument [Member]    
Assets    
Total derivative assets, fair value 0 0
Liabilities    
Total derivative liabilities, fair value 0 0
Derivatives not designated as hedging instrument [Member] | Foreign currency contracts [Member] | Other current assets [Member]    
Assets    
Total derivative assets, fair value 0 0
Derivatives not designated as hedging instrument [Member] | Foreign currency contracts [Member] | Accrued liabilities [Member]    
Liabilities    
Total derivative liabilities, fair value $ 0 $ 0