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Derivative Instruments - Derivatives and Hedges (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
MMBTU
Mar. 31, 2016
USD ($)
MMBTU
Dec. 31, 2016
USD ($)
Commodity forward contracts | Cash Flow Hedges      
Derivatives and Hedges      
Coverage of commodity forward contracts (in MM BTUs) | MMBTU 11,200,000 12,600,000  
Unrecognized (loss) gain included in Accumulated OCI $ 1 $ (4) $ 6
Commodity forward contracts gain (loss) recognized in OCI 6 (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  
Forward exchange contracts | Derivatives not designated as hedging instruments      
Derivatives and Hedges      
Foreign exchange contracts in various currencies $ 340 $ 660