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Derivative Instruments - Derivatives and Hedges (Details)
€ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
MMBTU
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
MMBTU
Sep. 30, 2017
EUR (€)
MMBTU
Sep. 30, 2017
USD ($)
MMBTU
Dec. 31, 2016
USD ($)
Commodity forwards contracts | Cash Flow Hedges              
Derivatives and Hedges              
Coverage of commodity forward contracts (in MM BTUs) | MMBTU   12,400,000   12,400,000 9,300,000 9,300,000  
Unrecognized (loss) gain included in Accumulated OCI   $ 2   $ 2   $ (1) $ 6
Commodity forward contracts gain (loss) recognized in OCI $ (1) (1) $ 3 2      
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other Expense              
Derivatives and Hedges              
Foreign exchange contracts gain (loss) recognized in income $ (2) 4 $ 4 6      
Forward exchange contracts | Derivatives not designated as hedging instruments              
Derivatives and Hedges              
Notional amount   $ 580   $ 580   320  
Cross-currency interest rate swap | Cash Flow Hedges              
Derivatives and Hedges              
Notional amount         € 81 $ 90  
Interest Rate Swaps | Derivatives designated as hedging instruments              
Derivatives and Hedges              
Notional amount | €         € 400