Available commercial paper.

No definition available.

Name:	apa_AvailableCommercialPaper
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Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Covenant, Minimum Additional Capital Raised

+ References

No definition available.

+ Details

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Namespace Prefix:	apa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Debt Instrument, Covenant, Minimum Consolidated Net Income For Three Consecutive Calendar Months

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Extended Financing Agreement Term

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Committed Amount

+ References

No definition available.

+ Details

Name:	apa_LIneOfCreditFacilityCommittedAmount
Namespace Prefix:	apa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of credit facility aggregate commitment amount.

+ References

No definition available.

+ Details

Name:	apa_LineOfCreditFacilityAggregateCommitmentAmount
Namespace Prefix:	apa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line Of Credit Facility, Number Of Extension Options

+ References

No definition available.

+ Details

Name:	apa_LineOfCreditFacilityNumberOfExtensionOptions
Namespace Prefix:	apa_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Period for borrowing funds.

+ References

No definition available.

+ Details

Name:	apa_PeriodForBorrowingFunds
Namespace Prefix:	apa_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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-Topic 835
-SubTopic 30
-Section 55
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-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

+ Details

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
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-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

Name:	us-gaap_FinanceLeaseLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
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Name:	us-gaap_FinanceLeaseLiabilityCurrent
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
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- Details

Name:	us-gaap_DebtInstrumentAxis=apa_NotesAndDebenturesMember
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Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
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DEBT AND FINANCING COSTS - Additional Information (Detail) £ in Millions	1 Months Ended		3 Months Ended
	Mar. 31, 2019 USD ($)	Nov. 30, 2018 USD ($) contract	Mar. 31, 2019 USD ($)	Mar. 31, 2019 GBP (£)	Mar. 01, 2019 USD ($)	Feb. 28, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Finance lease obligations, current	$ 30,000,000		$ 30,000,000
Finance lease obligations	68,000,000		68,000,000				$ 1,000,000
Available commercial paper	$ 3,500,000,000		3,500,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, committed amount								$ 4,000,000,000.0
Extended financing agreement term	1 year
Credit facility maximum borrowing capacity	$ 5,000,000,000.0		5,000,000,000.0
Letters of credit outstanding, amount	0		0
Letter of Credit
Debt Instrument [Line Items]
Line of credit facility, committed amount	2,080,000,000.00		2,080,000,000.00
Credit facility maximum borrowing capacity	3,000,000,000.0		3,000,000,000.0
Line of credit facility aggregate commitment amount \| £				£ 3.1
Notes And Debentures
Debt Instrument [Line Items]
Debt instrument, fair value	8,300,000,000		8,300,000,000				7,800,000,000
Unsecured Debt \| 6.9% senior notes due September 15, 2018
Debt Instrument [Line Items]
Debt instrument, face amount	$ 150,000,000		$ 150,000,000				$ 150,000,000
Debt instrument, stated interest rate	7.625%		7.625%	7.625%			7.625%
Unsecured Debt \| Notes And Debentures
Debt Instrument [Line Items]
Long-term debt, gross	$ 8,299,000,000		$ 8,299,000,000				$ 8,299,000,000
Altus Midstream LP \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Extended financing agreement term		1 year
Credit facility maximum borrowing capacity		$ 450,000,000			$ 1,500,000,000	$ 800,000,000
Line of credit facility, number of extension options \| contract		2
Debt covenant, minimum consolidated net income for three consecutive calendar months		$ 175,000,000
Debt covenant, minimum additional capital raised		$ 250,000,000
Borrowings on line of credit	0		$ 0
Altus Midstream LP \| Line of Credit \| Letter of Credit
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity						100,000,000
Altus Midstream LP \| Line of Credit \| Swingline Loan Subfacility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity						$ 100,000,000
Commercial Paper
Debt Instrument [Line Items]
Period for borrowing funds			270 days
Commercial Paper \| Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 159,000,000		$ 159,000,000				$ 0