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Derivative Instruments (Details)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2004
Net Investment Hedging
EUR (€)
Dec. 31, 2013
Commodity futures contracts
Cash Flow Hedges
USD ($)
MMBTU
Dec. 31, 2012
Commodity futures contracts
Cash Flow Hedges
USD ($)
MMBTU
Dec. 31, 2011
Commodity futures contracts
Cash Flow Hedges
USD ($)
Dec. 31, 2013
Commodity futures contracts
Cash Flow Hedges
Minimum
Dec. 31, 2013
Commodity futures contracts
Cash Flow Hedges
Maximum
Dec. 31, 2013
Forward exchange contracts
Derivatives not designated as hedging instruments
USD ($)
Dec. 31, 2012
Forward exchange contracts
Derivatives not designated as hedging instruments
USD ($)
Derivatives and Hedges                      
Coverage of commodity futures contracts (in MM BTUs)         5,400,000 7,000,000          
Unrecognized gain (loss) included in Accumulated OCI         $ 1 $ (1)          
Period during which unrecognized loss included in Accumulated OCI will be reclassified into earnings               12 months 24 months    
Commodity futures contracts gain (loss) recognized in OCI         1 (3) (10)        
Commodity futures contracts loss reclassified from accumulated OCI into income         (1) (8) (7)        
Senior notes       225              
Net investment hedge loss recognized in OCI     25                
Forward exchange contracts in various currencies                   550 750
Forward exchange contracts gain (loss) recognized in income $ (28) $ 6 $ (11)