Financial Instruments, Derivatives and Hedging Activities - Balance Sheet Location (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Designated as Hedging Instrument
Fair value of derivatives
Fair value of derivative instruments, Assets	$ 4	$ 7
Fair value of derivative instruments, Liabilities	15	10
Fair value of derivative instruments, Net Assets/(Liabilities)	(11)	(3)
Designated as Hedging Instrument \| Accounts receivable, net
Fair value of derivatives
Fair value of derivative instruments, Assets	4	6
Designated as Hedging Instrument \| Other assets
Fair value of derivatives
Fair value of derivative instruments, Assets		1
Designated as Hedging Instrument \| Accounts payable and accrued liabilities
Fair value of derivatives
Fair value of derivative instruments, Liabilities	12	6
Designated as Hedging Instrument \| Non-current liabilities
Fair value of derivatives
Fair value of derivative instruments, Liabilities	3	4
Designated as Hedging Instrument \| Commodity Contracts
Fair value of derivatives
Fair value of derivative instruments, Assets	2	6
Fair value of derivative instruments, Liabilities	15	9
Fair value of derivative instruments, Net Assets/(Liabilities)	(13)	(3)
Designated as Hedging Instrument \| Commodity Contracts \| Accounts receivable, net
Fair value of derivatives
Fair value of derivative instruments, Assets	2	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	12	6
Designated as Hedging Instrument \| Commodity Contracts \| Non-current liabilities
Fair value of derivatives
Fair value of derivative instruments, Liabilities	3	3
Designated as Hedging Instrument \| Foreign Currency Forward Contracts
Fair value of derivatives
Fair value of derivative instruments, Assets	2	1
Fair value of derivative instruments, Net Assets/(Liabilities)	2	1
Designated as Hedging Instrument \| Foreign Currency Forward Contracts \| Accounts receivable, net
Fair value of derivatives
Fair value of derivative instruments, Assets	2	1
Designated as Hedging Instrument \| Interest Rate Contracts
Fair value of derivatives
Fair value of derivative instruments, Liabilities		1
Fair value of derivative instruments, Net Assets/(Liabilities)		(1)
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	8	17
Fair value of derivative instruments, Liabilities	14	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	7	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	11	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, Liabilities	4	3
Fair value of derivative instruments, Net Assets/(Liabilities)	(4)	(3)
Not Designated as Hedging Instrument \| Commodity Contracts \| Accounts payable and accrued liabilities
Fair value of derivatives
Fair value of derivative instruments, Liabilities	4	3
Not Designated as Hedging Instrument \| Foreign Currency Forward Contracts
Fair value of derivatives
Fair value of derivative instruments, Assets	8	17
Fair value of derivative instruments, Liabilities	10	13
Fair value of derivative instruments, Net Assets/(Liabilities)	(2)	4
Not Designated as Hedging Instrument \| Foreign Currency Forward Contracts \| Accounts receivable, net
Fair value of derivatives
Fair value of derivative instruments, Assets	7	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	7	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

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 210
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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No definition available.

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