Commitment And Contingencies [Line Items]

No definition available.

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- Definition

Undiscounted amount of the accrual for environmental loss contingencies.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
-Paragraph 1
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Balance Type:	credit
Period Type:	instant

- Definition

Amount of loss contingency liability.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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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	3 Months Ended	12 Months Ended
COMMITMENTS AND CONTINGENCIES (Detail) $ in Millions	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Apr. 30, 2017 AUD ($)
Commitment And Contingencies [Line Items]
Accrued liability for legal contingencies	$ 35,000,000
Undiscounted reserve for environmental remediation	5,000,000
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
Australian Operations Divestiture Dispute \| Apache Australia Operation
Commitment And Contingencies [Line Items]
Gain contingency, unrecorded amount				$ 80
Loss contingency, estimated of possible loss amount			$ 200,000,000
Castex Lawsuit
Commitment And Contingencies [Line Items]
Plaintiffs alleged damages	60,000,000
Loss contingency, estimated of possible loss amount	$ 200,000,000