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Derivative instruments (Details 4) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets    
Total derivative assets, fair value $ 138 $ 111
Liabilities    
Total derivative liabilities, fair value 93 65
Derivatives designated as hedging instrument [Member]
   
Assets    
Total derivative assets, fair value 137 110
Liabilities    
Total derivative liabilities, fair value 93 64
Derivatives not designated as hedging instrument [Member]
   
Assets    
Total derivative assets, fair value 1 1
Liabilities    
Total derivative liabilities, fair value 0 1
Cross currency swap contracts [Member] | Other current assets/Other noncurrent assets [Member] | Derivatives designated as hedging instrument [Member]
   
Assets    
Total derivative assets, fair value 8 65
Cross currency swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] | Derivatives designated as hedging instrument [Member]
   
Liabilities    
Total derivative liabilities, fair value 72 6
Foreign currency contracts [Member] | Other current assets/Other noncurrent assets [Member] | Derivatives designated as hedging instrument [Member]
   
Assets    
Total derivative assets, fair value 107 45
Foreign currency contracts [Member] | Other current assets [Member] | Derivatives not designated as hedging instrument [Member]
   
Assets    
Total derivative assets, fair value 1 1
Foreign currency contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] | Derivatives designated as hedging instrument [Member]
   
Liabilities    
Total derivative liabilities, fair value 21 58
Foreign currency contracts [Member] | Accrued liabilities [Member] | Derivatives not designated as hedging instrument [Member]
   
Liabilities    
Total derivative liabilities, fair value 0 1
Interest rate swap contracts [Member] | Other current assets/Other noncurrent assets [Member] | Derivatives designated as hedging instrument [Member]
   
Assets    
Total derivative assets, fair value 22  
Interest rate swap contracts [Member] | Accrued liabilities/Other noncurrent liabilities [Member] | Derivatives designated as hedging instrument [Member]
   
Liabilities    
Total derivative liabilities, fair value $ 0