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Financial Instruments, Derivatives and Hedging Activities - Balance Sheet Location (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Designated as Hedging Instrument    
Fair value of derivatives    
Fair value of derivative instruments, Assets $ 22 $ 7
Fair value of derivative instruments, Liabilities 30 10
Fair value of derivative instruments, Net Assets/(Liabilities) (8) (3)
Designated as Hedging Instrument | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 14 6
Designated as Hedging Instrument | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets 8 1
Designated as Hedging Instrument | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 20 6
Designated as Hedging Instrument | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 10 4
Designated as Hedging Instrument | Commodity Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 8 6
Fair value of derivative instruments, Liabilities 22 9
Fair value of derivative instruments, Net Assets/(Liabilities) (14) (3)
Designated as Hedging Instrument | Commodity Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 8 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 17 6
Designated as Hedging Instrument | Commodity Contracts | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 5 3
Designated as Hedging Instrument | Foreign Currency Forward Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 12 1
Fair value of derivative instruments, Liabilities 8  
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 6 1
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets 6  
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 3  
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 5  
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 13 17
Fair value of derivative instruments, Liabilities 7 16
Fair value of derivative instruments, Net Assets/(Liabilities) 6 1
Not Designated as Hedging Instrument | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 12 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 4 12
Not Designated as Hedging Instrument | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 3 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 11 17
Fair value of derivative instruments, Liabilities 6 13
Fair value of derivative instruments, Net Assets/(Liabilities) 5 4
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 10 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 3 9
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities $ 3 $ 4