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Derivative Instruments (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
MMBTU
Sep. 30, 2014
USD ($)
MMBTU
Sep. 30, 2015
USD ($)
MMBTU
Sep. 30, 2014
USD ($)
MMBTU
Derivatives and Hedges        
Commodity forward contracts gain (loss) recognized in OCI $ 2      
Commodity forward contracts loss reclassified from accumulated OCI into income $ 4      
Commodity forward contracts | Cash Flow Hedges        
Derivatives and Hedges        
Coverage of commodity forward contracts (in MM BTUs) | MMBTU 6,300,000 1,800,000 6,300,000 1,800,000
Unrecognized (loss) gain included in Accumulated OCI $ 2 $ 1 $ 2 $ 1
Commodity forward contracts gain (loss) recognized in OCI   1 2 3
Commodity forward contracts loss reclassified from accumulated OCI into income     $ 6 2
Commodity forward contracts | Cash Flow Hedges | Minimum        
Derivatives and Hedges        
Period during which unrecognized loss included in Accumulated OCI will be reclassified into earnings     12 months  
Commodity forward contracts | Cash Flow Hedges | Maximum        
Derivatives and Hedges        
Period during which unrecognized loss included in Accumulated OCI will be reclassified into earnings     24 months  
Foreign exchange derivative contracts | Derivatives not designated as hedging instruments        
Derivatives and Hedges        
Forward exchange contracts gain (loss) recognized in income (4) 1 $ 2  
Forward exchange contracts | Derivatives not designated as hedging instruments        
Derivatives and Hedges        
Forward exchange contracts in various currencies $ 600 $ 520 $ 600 $ 520