Financial Risk Management Activities - Gross and Net Fair Values (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Derivatives Fair Value [Line Items]
ASSETS - Gross fair value of derivative contracts	$ 1	$ 9
ASSETS – Master netting arrangements		(1)
ASSETS - Net fair value of derivative contracts	1	8
LIABILITIES - Gross fair value of derivative contracts	(13)	(1)
LIABILITIES - Master netting arrangements		1
LIABILITIES - Net fair value of derivative contracts	(13)	0
Designated As Hedging Instrument
Derivatives Fair Value [Line Items]
ASSETS - Gross fair value of derivative contracts	0	0
LIABILITIES - Gross fair value of derivative contracts	(11)	0
Designated As Hedging Instrument \| Commodity, Crude Oil \| Accounts Payable
Derivatives Fair Value [Line Items]
LIABILITIES - Gross fair value of derivative contracts	(7)
Designated As Hedging Instrument \| Interest Rate Contract
Derivatives Fair Value [Line Items]
ASSETS - Gross fair value of derivative contracts		0
LIABILITIES - Gross fair value of derivative contracts	(4)	0
Derivative Contracts Not Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
ASSETS - Gross fair value of derivative contracts	1	9
LIABILITIES - Gross fair value of derivative contracts	(2)	(1)
Derivative Contracts Not Designated as Hedging Instruments \| Commodity, Crude Oil \| Accounts Payable
Derivatives Fair Value [Line Items]
LIABILITIES - Gross fair value of derivative contracts	(2)
Derivative Contracts Not Designated as Hedging Instruments \| Foreign Exchange
Derivatives Fair Value [Line Items]
ASSETS - Gross fair value of derivative contracts	1	9
LIABILITIES - Gross fair value of derivative contracts	0	$ (1)
Other Assets (Noncurrent) \| Designated As Hedging Instrument \| Interest Rate Contract
Derivatives Fair Value [Line Items]
ASSETS - Gross fair value of derivative contracts	$ 0

Fair value, before 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 elected not to be offset.

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- Definition

Fair value of liability associated with 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.

+ References

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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Fair value of asset associated with financial liability or 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.

+ References

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- Definition

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+ References

No definition available.

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