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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivatives and Hedges        
Foreign exchange contracts gain (loss) recognized in income $ (7) $ (1) $ (19) $ 9
Commodity futures contracts | Cash Flow Hedges
       
Derivatives and Hedges        
Coverage of commodity futures contracts (in MM BTUs) 6,600,000 6,300,000 6,600,000 6,300,000
Unrecognized loss included in Accumulated OCI 1   1  
Commodity futures contracts gain (loss) recognized in OCI   1   (1)
Commodity futures contracts gain (loss) reclassified from accumulated OCI into income   (2)   (7)
Commodity futures contracts | Cash Flow Hedges | Minimum
       
Derivatives and Hedges        
Period during which unrecognized loss included in Accumulated OCI will be reclassified into earnings     12 months  
Commodity futures contracts | Cash Flow Hedges | Maximum
       
Derivatives and Hedges        
Period during which unrecognized loss included in Accumulated OCI will be reclassified into earnings     24 months  
Foreign exchange contracts | Derivatives not designated as hedging instruments
       
Derivatives and Hedges        
Foreign exchange contracts in various currencies $ 740 $ 640 $ 740 $ 640