Derivatives (Details 3) (Derivatives not designated as hedging instruments, USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Derivatives not designated as hedging instruments    
Gain (Loss) on Derivative Recognized in income $ 89 $ 32
Foreign currency forward/option contracts
   
Derivatives not designated as hedging instruments    
Derivative notional amount 7,100  
Foreign currency forward/option contracts | Cost of Sales
   
Derivatives not designated as hedging instruments    
Gain (Loss) on Derivative Recognized in income 4 (1)
Foreign currency forward contracts | Interest expense
   
Derivatives not designated as hedging instruments    
Gain (Loss) on Derivative Recognized in income 89 33
Commodity price swap contracts | Cost of Sales
   
Derivatives not designated as hedging instruments    
Gain (Loss) on Derivative Recognized in income $ (4)