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Derivative Instruments - Derivatives and Hedges (Details)
€ in Millions, $ in Millions, $ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
MMBTU
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
MMBTU
Jun. 30, 2018
AUD ($)
MMBTU
Jun. 30, 2018
NZD ($)
MMBTU
Jun. 30, 2018
USD ($)
MMBTU
Dec. 31, 2017
EUR (€)
MMBTU
Dec. 31, 2017
USD ($)
MMBTU
Derivatives and Hedges                  
Commodity forward contracts | MMBTU   9,800,000   9,800,000 8,000,000 8,000,000 8,000,000 8,800,000 8,800,000
Commodity forwards contracts | Cash Flow Hedges | Derivatives designated as hedging instruments                  
Derivatives and Hedges                  
Unrecognized (loss) gain included in Accumulated OCI   $ (1)   $ (1)     $ 7   $ 3
Amount of gain (loss) Recognized in OCI $ 4 (2) $ 5 4          
Amount of gain (loss) reclassified from Accumulated OCI into Income     (1)            
Foreign exchange contracts | Derivatives not designated as hedging instruments                  
Derivatives and Hedges                  
Notional amount   340   340     380    
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other expense                  
Derivatives and Hedges                  
Foreign exchange contracts gain (loss) recognized in income   $ 4   $ 6          
Cross-currency interest rate swap | Cash Flow Hedges                  
Derivatives and Hedges                  
Amount of gain (loss) Recognized in OCI 14   1            
Amount of gain (loss) reclassified from Accumulated OCI into Income $ 18   $ 10            
Cross-currency interest rate swap | Cash Flow Hedges | Euro-functional subsidiaries                  
Derivatives and Hedges                  
Unrecognized (loss) gain included in Accumulated OCI             (8)    
Notional amount               € 263 310
Cross-currency interest rate swap | Cash Flow Hedges | AUD and NZD functional subsidiaries combined                  
Derivatives and Hedges                  
Unrecognized (loss) gain included in Accumulated OCI             (3)    
Cross-currency interest rate swap | Cash Flow Hedges | AUD functional subsidiary                  
Derivatives and Hedges                  
Notional amount         $ 231   170    
Cross-currency interest rate swap | Cash Flow Hedges | NZD functional subsidiary                  
Derivatives and Hedges                  
Notional amount           $ 161 $ 110    
Cross-currency interest rate swap | Cash Flow Hedges | Maximum | Euro-functional subsidiaries                  
Derivatives and Hedges                  
Unrecognized (loss) gain included in Accumulated OCI                 $ (1)
Interest Rate Swaps | Derivatives designated as hedging instruments                  
Derivatives and Hedges                  
Notional amount | €               € 725