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Derivative Instruments - Derivatives and Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Derivatives and Hedges        
Net cash proceeds for hedging activity   $ (28)    
Commodity forward contracts | Cash Flow Hedges        
Derivatives and Hedges        
Unrecognized (loss) gain included in Accumulated OCI   1 $ 1 $ (8)
Cross-currency swap | Cash Flow Hedges        
Derivatives and Hedges        
Unrecognized (loss) gain included in Accumulated OCI   (19) (9) (9)
Net cash proceeds for hedging activity $ 15      
Interest rate swaps | Cash Flow Hedges        
Derivatives and Hedges        
Unrecognized (loss) gain included in Accumulated OCI   (2)    
Interest rate swaps | Cash Flow Hedges | Maximum        
Derivatives and Hedges        
Unrecognized (loss) gain included in Accumulated OCI     (1) 1
Interest rate swaps | Net investment hedges        
Derivatives and Hedges        
Unrecognized (loss) gain included in Accumulated OCI   $ 12 $ 4  
Interest rate swaps | Net investment hedges | Maximum        
Derivatives and Hedges        
Unrecognized (loss) gain included in Accumulated OCI       $ (1)
Interest rate swaps | Fair Value Hedges | Derivatives designated as hedging instruments        
Derivatives and Hedges        
Net cash proceeds for hedging activity $ 13