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Financial Instruments, Derivatives and Hedging Activities - Balance Sheet Location (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Designated as Hedging Instrument    
Fair value of derivatives    
Fair value of derivative instruments, Assets $ 18 $ 7
Fair value of derivative instruments, Liabilities 19 10
Fair value of derivative instruments, Net Assets/(Liabilities) (1) (3)
Designated as Hedging Instrument | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 15 6
Designated as Hedging Instrument | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets 3 1
Designated as Hedging Instrument | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 14 6
Designated as Hedging Instrument | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 5 4
Designated as Hedging Instrument | Commodity Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 10 6
Fair value of derivative instruments, Liabilities 17 9
Fair value of derivative instruments, Net Assets/(Liabilities) (7) (3)
Designated as Hedging Instrument | Commodity Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 10 5
Designated as Hedging Instrument | Commodity Contracts | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets   1
Designated as Hedging Instrument | Commodity Contracts | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 13 6
Designated as Hedging Instrument | Commodity Contracts | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 4 3
Designated as Hedging Instrument | Foreign Currency Forward Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 6 1
Fair value of derivative instruments, Liabilities 2  
Fair value of derivative instruments, Net Assets/(Liabilities) 4 1
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 5 1
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets 1  
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 1  
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 1  
Designated as Hedging Instrument | Interest Rate Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 2  
Fair value of derivative instruments, Liabilities   1
Fair value of derivative instruments, Net Assets/(Liabilities) 2 (1)
Designated as Hedging Instrument | Interest Rate Contracts | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets 2  
Designated as Hedging Instrument | Interest Rate Contracts | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities   1
Not Designated as Hedging Instrument    
Fair value of derivatives    
Fair value of derivative instruments, Assets 5 17
Fair value of derivative instruments, Liabilities 10 16
Fair value of derivative instruments, Net Assets/(Liabilities) (5) 1
Not Designated as Hedging Instrument | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 4 16
Not Designated as Hedging Instrument | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets 1 1
Not Designated as Hedging Instrument | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 6 12
Not Designated as Hedging Instrument | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 4 4
Not Designated as Hedging Instrument | Commodity Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 2  
Fair value of derivative instruments, Liabilities 1 3
Fair value of derivative instruments, Net Assets/(Liabilities) 1 (3)
Not Designated as Hedging Instrument | Commodity Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 2  
Not Designated as Hedging Instrument | Commodity Contracts | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 1 3
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 3 17
Fair value of derivative instruments, Liabilities 9 13
Fair value of derivative instruments, Net Assets/(Liabilities) (6) 4
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 2 16
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets 1 1
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 5 9
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities $ 4 $ 4