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Financial Instruments, Derivatives and Hedging Activities - Balance Sheet Location (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Designated as Hedging Instrument    
Fair value of derivatives    
Fair value of derivative instruments, Assets $ 83 $ 61
Fair value of derivative instruments, Liabilities 9 18
Fair value of derivative instruments, Net Assets/(Liabilities) 74 43
Designated as Hedging Instrument | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 73 57
Designated as Hedging Instrument | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets 10 4
Designated as Hedging Instrument | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 7 16
Designated as Hedging Instrument | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 2 2
Designated as Hedging Instrument | Commodity Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 79 54
Fair value of derivative instruments, Liabilities 6 6
Fair value of derivative instruments, Net Assets/(Liabilities) 73 48
Designated as Hedging Instrument | Commodity Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 72 50
Designated as Hedging Instrument | Commodity Contracts | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets 7 4
Designated as Hedging Instrument | Commodity Contracts | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 4 4
Designated as Hedging Instrument | Commodity Contracts | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 2 2
Designated as Hedging Instrument | Foreign Currency Forward Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 4 7
Fair value of derivative instruments, Liabilities 3 12
Fair value of derivative instruments, Net Assets/(Liabilities) 1 (5)
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 1 7
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets 3  
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 3 12
Not Designated as Hedging Instrument    
Fair value of derivatives    
Fair value of derivative instruments, Assets 12 8
Fair value of derivative instruments, Liabilities 16 11
Fair value of derivative instruments, Net Assets/(Liabilities) (4) (3)
Not Designated as Hedging Instrument | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 12 7
Not Designated as Hedging Instrument | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets   1
Not Designated as Hedging Instrument | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 16 9
Not Designated as Hedging Instrument | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities   2
Not Designated as Hedging Instrument | Commodity Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 5 3
Fair value of derivative instruments, Liabilities 3 1
Fair value of derivative instruments, Net Assets/(Liabilities) 2 2
Not Designated as Hedging Instrument | Commodity Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 5 3
Not Designated as Hedging Instrument | Commodity Contracts | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 3 1
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 7 5
Fair value of derivative instruments, Liabilities 13 10
Fair value of derivative instruments, Net Assets/(Liabilities) (6) (5)
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 7 4
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets   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 $ 13 8
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities   $ 2