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Derivative Instruments (Details 2)
In Millions, unless otherwise specified
3 Months Ended9 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
USD ($)
Sep. 30, 2010
USD ($)
Sep. 30, 2011
USD ($)
Sep. 30, 2010
USD ($)
Dec. 31, 2004
EUR (€)
Sep. 30, 2011
Commodity futures contracts
Cash Flow Hedges
USD ($)
MillionsOfBTU
Sep. 30, 2010
Commodity futures contracts
Cash Flow Hedges
USD ($)
MillionsOfBTU
Sep. 30, 2011
Commodity futures contracts
Cash Flow Hedges
USD ($)
MillionsOfBTU
Sep. 30, 2010
Commodity futures contracts
Cash Flow Hedges
USD ($)
MillionsOfBTU
Derivatives and Hedges         
Coverage of commodity futures contracts (in MM BTUs)     5,100,0008,100,0005,100,0008,100,000
Unrecognized loss included in Accumulated OCI     $ 4$ 6$ 4$ 6
Period during which unrecognized loss included in Accumulated OCI will be reclassified into earnings (in months)       From 12 months to 24 months 
Commodity futures contracts gain (loss) recognized in OCI     (3)(6)(5)(12)
Commodity futures contracts gain (loss) reclassified from accumulated OCI into income     (1)(2)(4)(7)
Senior notes designated as net investment hedge    225    
Net investment hedge gain (loss) recognized in OCI (32)(25)19     
Forward exchange and option agreements in various currencies7401,7007401,700     
Foreign exchange contracts gain (loss) recognized in income$ 10$ 8$ (14)$ 49