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Derivative Instruments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2014
Commodity futures contracts
Cash Flow Hedges
MMBTU
Jun. 30, 2013
Commodity futures contracts
Cash Flow Hedges
MMBTU
Jun. 30, 2014
Commodity futures contracts
Cash Flow Hedges
MMBTU
Jun. 30, 2013
Forward exchange contracts
Derivatives not designated as hedging instruments
Jun. 30, 2014
Forward exchange contracts
Derivatives not designated as hedging instruments
Jun. 30, 2013
Forward exchange contracts
Derivatives not designated as hedging instruments
Derivatives and Hedges            
Coverage of commodity futures contracts (in MM BTUs) 2,900,000 7,400,000 2,900,000      
Unrecognized gain (loss) included in Accumulated OCI $ 1 $ (1) $ 1      
Period during which unrecognized gain included in Accumulated OCI will be reclassified into earnings     12 months      
Amount of Gain (Loss) recognized in OCI on Commodity Futures Contracts (Effective Portion)   (3) 2      
Commodity futures contracts gain reclassified from accumulated OCI into income 1 1 2      
Forward exchange contracts in various currencies       740 510 740
Forward exchange contracts gain (loss) recognized in income       $ (9) $ (1) $ (12)