Financial Instruments, Derivatives and Hedging Activities - Balance Sheet Location (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Designated as Hedging Instrument [Member]
Fair value of derivatives
Fair value of derivative instruments, Assets	$ 103	$ 61
Fair value of derivative instruments, Liabilities	36	18
Fair value of derivative instruments, Net Assets/(Liabilities)	67	43
Designated as Hedging Instrument [Member] | Accounts Receivable, Net [Member]
Fair value of derivatives
Fair value of derivative instruments, Assets	81	57
Designated as Hedging Instrument [Member] | Other assets
Fair value of derivatives
Fair value of derivative instruments, Assets	22	4
Designated as Hedging Instrument [Member] | Accounts Payable and Accrued Liabilities [Member]
Fair value of derivatives
Fair value of derivative instruments, Liabilities	28	16
Designated as Hedging Instrument [Member] | Non Current Liabilities [Member]
Fair value of derivatives
Fair value of derivative instruments, Liabilities	8	2
Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Fair value of derivatives
Fair value of derivative instruments, Assets	86	54
Fair value of derivative instruments, Liabilities	9	6
Fair value of derivative instruments, Net Assets/(Liabilities)	77	48
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Accounts Receivable, Net [Member]
Fair value of derivatives
Fair value of derivative instruments, Assets	71	50
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Other assets
Fair value of derivatives
Fair value of derivative instruments, Assets	15	4
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Accounts Payable and Accrued Liabilities [Member]
Fair value of derivatives
Fair value of derivative instruments, Liabilities	6	4
Designated as Hedging Instrument [Member] | Commodity Contract [Member] | Non Current Liabilities [Member]
Fair value of derivatives
Fair value of derivative instruments, Liabilities	3	2
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]
Fair value of derivatives
Fair value of derivative instruments, Assets	17	7
Fair value of derivative instruments, Liabilities	27	12
Fair value of derivative instruments, Net Assets/(Liabilities)	(10)	(5)
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Accounts Receivable, Net [Member]
Fair value of derivatives
Fair value of derivative instruments, Assets	10	7
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other assets
Fair value of derivatives
Fair value of derivative instruments, Assets	7
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Accounts Payable and Accrued Liabilities [Member]
Fair value of derivatives
Fair value of derivative instruments, Liabilities	22	12
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Non Current Liabilities [Member]
Fair value of derivatives
Fair value of derivative instruments, Liabilities	5
Not Designated as Hedging Instrument
Fair value of derivatives
Fair value of derivative instruments, Assets	13	8
Fair value of derivative instruments, Liabilities	1	11
Fair value of derivative instruments, Net Assets/(Liabilities)	12	(3)
Not Designated as Hedging Instrument | Accounts Receivable, Net [Member]
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	3	1
Not Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities [Member]
Fair value of derivatives
Fair value of derivative instruments, Liabilities	1	9
Not Designated as Hedging Instrument | Non Current Liabilities [Member]
Fair value of derivatives
Fair value of derivative instruments, Liabilities		2
Not Designated as Hedging Instrument | Commodity Contract [Member]
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 Contract [Member] | Accounts Receivable, Net [Member]
Fair value of derivatives
Fair value of derivative instruments, Assets	3	3
Not Designated as Hedging Instrument | Commodity Contract [Member] | Accounts Payable and Accrued Liabilities [Member]
Fair value of derivatives
Fair value of derivative instruments, Liabilities	1	1
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member]
Fair value of derivatives
Fair value of derivative instruments, Assets	10	5
Fair value of derivative instruments, Liabilities		10
Fair value of derivative instruments, Net Assets/(Liabilities)	10	(5)
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member] | Accounts Receivable, Net [Member]
Fair value of derivatives
Fair value of derivative instruments, Assets	7	4
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member] | Other assets
Fair value of derivatives
Fair value of derivative instruments, Assets	$ 3	1
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member] | Accounts Payable and Accrued Liabilities [Member]
Fair value of derivatives
Fair value of derivative instruments, Liabilities		8
Not Designated as Hedging Instrument | Foreign Exchange Forward [Member] | Non Current Liabilities [Member]
Fair value of derivatives
Fair value of derivative instruments, Liabilities		$ 2