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Financial Instruments, Derivatives and Hedging Activities - Balance Sheet Location (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Designated as Hedging Instrument    
Fair value of derivatives    
Fair value of derivative instruments, Assets $ 61 $ 17
Fair value of derivative instruments, Liabilities 18 25
Fair value of derivative instruments, Net Assets/(Liabilities) 43 (8)
Designated as Hedging Instrument | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 57 12
Designated as Hedging Instrument | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets 4 5
Designated as Hedging Instrument | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 16 17
Designated as Hedging Instrument | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 2 8
Designated as Hedging Instrument | Commodity Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 54 6
Fair value of derivative instruments, Liabilities 6 17
Fair value of derivative instruments, Net Assets/(Liabilities) 48 (11)
Designated as Hedging Instrument | Commodity Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 50 5
Designated as Hedging Instrument | Commodity Contracts | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets 4 1
Designated as Hedging Instrument | Commodity Contracts | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 4 13
Designated as Hedging Instrument | Commodity Contracts | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 2 4
Designated as Hedging Instrument | Foreign Currency Forward Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 7 10
Fair value of derivative instruments, Liabilities 12 8
Fair value of derivative instruments, Net Assets/(Liabilities) (5) 2
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 7 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 12 4
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities   4
Designated as Hedging Instrument | Interest Rate Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets   1
Fair value of derivative instruments, Net Assets/(Liabilities)   1
Designated as Hedging Instrument | Interest Rate Contracts | Other assets    
Fair value of derivatives    
Fair value of derivative instruments, Assets   1
Not Designated as Hedging Instrument    
Fair value of derivatives    
Fair value of derivative instruments, Assets 8 7
Fair value of derivative instruments, Liabilities 11 11
Fair value of derivative instruments, Net Assets/(Liabilities) (3) (4)
Not Designated as Hedging Instrument | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 7 6
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 9 9
Not Designated as Hedging Instrument | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 2 2
Not Designated as Hedging Instrument | Commodity Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 3 2
Fair value of derivative instruments, Liabilities 1 1
Fair value of derivative instruments, Net Assets/(Liabilities) 2 1
Not Designated as Hedging Instrument | Commodity Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 3 2
Not Designated as Hedging Instrument | Commodity Contracts | Accounts payable and accrued liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities 1 1
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts    
Fair value of derivatives    
Fair value of derivative instruments, Assets 5 5
Fair value of derivative instruments, Liabilities 10 10
Fair value of derivative instruments, Net Assets/(Liabilities) (5) (5)
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts receivable, net    
Fair value of derivatives    
Fair value of derivative instruments, Assets 4 4
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 8 8
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Non-current liabilities    
Fair value of derivatives    
Fair value of derivative instruments, Liabilities $ 2 $ 2