Financial Instruments, Derivatives and Hedging Activities - Balance Sheet Location (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Designated as Hedging Instrument
Fair value of derivatives
Fair value of derivative instruments, Assets	$ 57	$ 61
Fair value of derivative instruments, Liabilities	7	18
Fair value of derivative instruments, Net Assets/(Liabilities)	50	43
Designated as Hedging Instrument | Accounts receivable, net
Fair value of derivatives
Fair value of derivative instruments, Assets	55	57
Designated as Hedging Instrument | Other assets
Fair value of derivatives
Fair value of derivative instruments, Assets	2	4
Designated as Hedging Instrument | Accounts payable and accrued liabilities
Fair value of derivatives
Fair value of derivative instruments, Liabilities	6	16
Designated as Hedging Instrument | Non-current liabilities
Fair value of derivatives
Fair value of derivative instruments, Liabilities	1	2
Designated as Hedging Instrument | Commodity Contracts
Fair value of derivatives
Fair value of derivative instruments, Assets	55	54
Fair value of derivative instruments, Liabilities	3	6
Fair value of derivative instruments, Net Assets/(Liabilities)	52	48
Designated as Hedging Instrument | Commodity Contracts | Accounts receivable, net
Fair value of derivatives
Fair value of derivative instruments, Assets	54	50
Designated as Hedging Instrument | Commodity Contracts | Other assets
Fair value of derivatives
Fair value of derivative instruments, Assets	1	4
Designated as Hedging Instrument | Commodity Contracts | Accounts payable and accrued liabilities
Fair value of derivatives
Fair value of derivative instruments, Liabilities	2	4
Designated as Hedging Instrument | Commodity Contracts | Non-current liabilities
Fair value of derivatives
Fair value of derivative instruments, Liabilities	1	2
Designated as Hedging Instrument | Foreign Currency Forward Contracts
Fair value of derivatives
Fair value of derivative instruments, Assets	2	7
Fair value of derivative instruments, Liabilities	4	12
Fair value of derivative instruments, Net Assets/(Liabilities)	(2)	(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	1
Designated as Hedging Instrument | Foreign Currency Forward Contracts | Accounts payable and accrued liabilities
Fair value of derivatives
Fair value of derivative instruments, Liabilities	4	12
Not Designated as Hedging Instrument
Fair value of derivatives
Fair value of derivative instruments, Assets	11	8
Fair value of derivative instruments, Liabilities	12	11
Fair value of derivative instruments, Net Assets/(Liabilities)	(1)	(3)
Not Designated as Hedging Instrument | Accounts receivable, net
Fair value of derivatives
Fair value of derivative instruments, Assets	10	7
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	11	9
Not Designated as Hedging Instrument | Non-current liabilities
Fair value of derivatives
Fair value of derivative instruments, Liabilities	1	2
Not Designated as Hedging Instrument | Commodity Contracts
Fair value of derivatives
Fair value of derivative instruments, Assets	3	3
Fair value of derivative instruments, Liabilities	1	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	3	3
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	8	5
Fair value of derivative instruments, Liabilities	11	10
Fair value of derivative instruments, Net Assets/(Liabilities)	(3)	(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	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	10	8
Not Designated as Hedging Instrument | Foreign Currency Forward Contracts | Non-current liabilities
Fair value of derivatives
Fair value of derivative instruments, Liabilities	$ 1	$ 2