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Derivative Instruments - Derivatives and Hedges (Details)
€ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
MMBTU
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
MMBTU
Jun. 30, 2017
EUR (€)
MMBTU
Jun. 30, 2017
USD ($)
MMBTU
Dec. 31, 2016
USD ($)
Commodity futures contracts | Cash Flow Hedges              
Derivatives and Hedges              
Coverage of commodity forward contracts (in MM BTUs) | MMBTU   11,300,000   11,300,000 9,800,000 9,800,000  
Unrecognized (loss) gain included in Accumulated OCI   $ 3   $ 3   $ (1) $ 6
Commodity forward contracts gain (loss) recognized in OCI $ (2) 7 $ 4 3      
Commodity forward contracts gain (loss) reclassified from accumulated OCI into income   (2)          
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other Expense              
Derivatives and Hedges              
Foreign exchange contracts gain (loss) recognized in income $ 4 (1) $ 6 4      
Forward exchange contracts | Derivatives not designated as hedging instruments              
Derivatives and Hedges              
Notional amount   $ 524   $ 524   340  
Cross-currency interest rate swap | Cash Flow Hedges              
Derivatives and Hedges              
Notional amount         € 81 $ 90