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Derivative Instruments - Derivatives and Hedges (Details)
€ in Millions, $ in Millions
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Commodity forwards contracts | Derivatives designated as hedging instruments            
Derivatives and Hedges            
Notional amount $ 20   $ 21 $ 31    
Commodity forwards contracts | Cash Flow Hedges            
Derivatives and Hedges            
Unrecognized (loss) gain included in Accumulated OCI 3   1 4    
Foreign exchange contracts | Derivatives not designated as hedging instruments            
Derivatives and Hedges            
Notional amount 625   470 350    
Cross-currency swap | Euro-functional subsidiaries            
Derivatives and Hedges            
Notional amount 210 € 184     $ 310 € 263
Cross-currency swap | AUD functional subsidiary            
Derivatives and Hedges            
Notional amount 168          
Cross-currency swap | NZD functional subsidiary            
Derivatives and Hedges            
Notional amount 109          
Cross-currency swap | Cash Flow Hedges            
Derivatives and Hedges            
Unrecognized (loss) gain included in Accumulated OCI (11)   (9) $ (6)    
Interest Rate Risk | Cash Flow Hedges | Maximum            
Derivatives and Hedges            
Unrecognized (loss) gain included in Accumulated OCI $ (1)   $ (1)