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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
MMBTU
Mar. 31, 2013
MMBTU
Commodity futures contracts | Cash Flow Hedges
   
Derivatives and Hedges    
Coverage of commodity futures contracts (in MM BTUs) 4,400,000 6,200,000
Unrecognized gain included in Accumulated OCI $ 2 $ 2
Amount of Gain recognized in OCI on Commodity Futures Contracts (Effective Portion) 2 3
Commodity futures contracts gain (loss) reclassified from accumulated OCI into income 1 (1)
Commodity futures contracts | Cash Flow Hedges | Minimum
   
Derivatives and Hedges    
Period during which unrecognized gain 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 gain included in Accumulated OCI will be reclassified into earnings 24 months  
Forward exchange contracts | Derivatives not designated as hedging instruments
   
Derivatives and Hedges    
Forward exchange contracts in various currencies 670 900
Forward exchange contracts loss recognized in income $ (1) $ (3)