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Derivative Instruments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
MMBTU
Dec. 31, 2014
USD ($)
MMBTU
Dec. 31, 2013
USD ($)
Derivatives and Hedges      
Foreign exchange contracts gain (loss) recognized in income $ 10 $ (8) $ (28)
Commodity forward contracts | Cash Flow Hedges      
Derivatives and Hedges      
Coverage of commodity forward contracts (in MM BTUs) | MMBTU 7,300,000 450,000  
Unrecognized (loss) gain included in Accumulated OCI $ (4) $ (1)  
Commodity forward contracts gain (loss) recognized in OCI (4) 3 1
Commodity forward contracts loss reclassified from accumulated OCI into income $ (1) 2 $ (1)
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    
Forward exchange contracts | Derivatives not designated as hedging instruments      
Derivatives and Hedges      
Forward exchange contracts in various currencies $ 790 $ 524