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Derivative Instruments - Derivatives and Hedges (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
MMBTU
Mar. 31, 2015
USD ($)
MMBTU
Commodity forward contracts | Cash Flow Hedges    
Derivatives and Hedges    
Coverage of commodity forward contracts (in MM BTUs) | MMBTU 12,600,000 5,400,000
Unrecognized (loss) gain included in Accumulated OCI $ (4) $ (1)
Commodity forward contracts gain (loss) recognized in OCI (4)  
Commodity forward contracts gain (loss) reclassified from accumulated OCI into income 2  
Foreign exchange derivative contracts | Derivatives not designated as hedging instruments | Other Expenses.    
Derivatives and Hedges    
Foreign exchange contracts gain (loss) recognized in income 5 11
Forward exchange contracts | Derivatives not designated as hedging instruments    
Derivatives and Hedges    
Foreign exchange contracts in various currencies $ 660 $ 532