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Derivative Instruments (Details)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2012
USD ($)
Mar. 31, 2011
USD ($)
Dec. 31, 2004
EUR (€)
Mar. 31, 2012
Commodity futures contracts
Cash Flow Hedges
USD ($)
mmbtu
Mar. 31, 2011
Commodity futures contracts
Cash Flow Hedges
USD ($)
mmbtu
Mar. 31, 2012
Commodity futures contracts
Cash Flow Hedges
Maximum
Mar. 31, 2012
Commodity futures contracts
Cash Flow Hedges
Minimum
Derivatives and Hedges              
Coverage of commodity futures contracts (in MM BTUs)       4,600,000 8,000,000    
Unrecognized loss included in Accumulated OCI       $ (6) $ (2)    
Period during which unrecognized loss included in Accumulated OCI will be reclassified into earnings (in months)           24 months 12 months
Commodity futures contracts loss recognized in OCI       (3) (1)    
Commodity futures contracts loss reclassified from accumulated OCI into income       (3) (2)    
Senior notes designated as net investment hedge     225        
Net investment hedge gain (loss) recognized in OCI   (18)          
Forward exchange and option agreements in various currencies 640 881          
Foreign exchange contracts gain (loss) recognized in income $ 1 $ (7)