Commitment And Contingencies [Line Items]

No definition available.

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- Definition

Undiscounted amount of the accrual for environmental loss contingencies.

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Balance Type:	credit
Period Type:	instant

- Definition

The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency.

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Balance Type:	credit
Period Type:	instant

- Definition

Energy volume that must be purchased within the specified time period of the agreement to avoid penalties or unfavorable effects on pricing, among other adverse consequences.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Amount of loss contingency liability.

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Balance Type:	credit
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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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Balance Type:	debit
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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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COMMITMENTS AND CONTINGENCIES (Detail) $ in Millions	9 Months Ended	12 Months Ended
COMMITMENTS AND CONTINGENCIES (Detail) $ in Millions	Sep. 30, 2018 USD ($) MMBTU	Dec. 31, 2017 USD ($)	Apr. 30, 2017 AUD ($)
Commitment And Contingencies [Line Items]
Accrued liability for legal contingencies	$ 39,000,000
Undiscounted reserve for environmental remediation	$ 4,000,000
Transportation agreement term	10 years
Transportation agreement, minimum energy volume required (in MMBtu) \| MMBTU	500,000
Australian Operations Divestiture Dispute \| Apache Australia Operation
Commitment And Contingencies [Line Items]
Gain contingency, unrecorded amount			$ 80
Divestiture of business, tax and other issues contingency amount		$ 200,000,000
Apollo Exploration Lawsuit
Commitment And Contingencies [Line Items]
Plaintiffs alleged damages	$ 200,000,000
Apollo Exploration Lawsuit \| Minimum
Commitment And Contingencies [Line Items]
Plaintiffs alleged damages		$ 1,100,000,000.0