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Derivative Instruments (Details 2)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2004
EUR (€)
Dec. 31, 2011
Commodity futures contracts
Cash Flow Hedges
USD ($)
MillionsOfBTU
Dec. 31, 2010
Commodity futures contracts
Cash Flow Hedges
USD ($)
MillionsOfBTU
Dec. 31, 2009
Commodity futures contracts
Cash Flow Hedges
USD ($)
Dec. 31, 2011
Commodity futures contracts
Cash Flow Hedges
Maximum
Dec. 31, 2011
Commodity futures contracts
Cash Flow Hedges
Minimum
Derivatives and Hedges                  
Coverage of commodity futures contracts (in MM BTUs)         5,100,000 8,900,000      
Unrecognized loss included in Accumulated OCI         $ 6 $ 3      
Period during which unrecognized loss included in Accumulated OCI will be reclassified into earnings (in months)               24 months 12 months
Commodity futures contracts gain (loss) recognized in OCI         (10) (11) (24)    
Commodity futures contracts gain (loss) reclassified from accumulated OCI into income         (7) (9) (61)    
Senior notes designated as net investment hedge       225          
Net investment hedge gain (loss) recognized in OCI 25 24 (9)            
Forward exchange and option agreements in various currencies 550 1,700              
Foreign exchange contracts gain (loss) recognized in income $ (11) $ 18 $ (8)