Debt Instrument, Repurchase Early Tender Premium

No definition available.

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

- Definition

Extended Financing Agreement Term

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Line Of Credit Facility, Committed Amount

+ References

No definition available.

+ Details

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

- Definition

Line Of Credit Facility, Maximum Borrowing Capacity, If Adding New Lenders

+ References

No definition available.

+ Details

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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

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

- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References

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

- 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
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-Section 50
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+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
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
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+ Details

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

- Definition

Increase for accrued, but unpaid interest on the debt instrument for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
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

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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+ Details

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

- Definition

Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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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+ Details

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Namespace Prefix:	us-gaap_
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

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

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
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Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=apa_A3.635SeniorNotesDueFebruary12021Member
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Period Type:

- Details

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Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=apa_SwinglineLoanSubfacilityMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=apa_A4.625NotesDue2025Member
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- Details

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DEBT AND FINANCING COSTS - Additional Information (Details) £ in Millions			1 Months Ended		3 Months Ended			9 Months Ended
	Nov. 03, 2020	Aug. 18, 2020 USD ($)	Mar. 31, 2019 USD ($)	Nov. 30, 2018 USD ($) contract	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 GBP (£)	Aug. 17, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Current debt outstanding amount					$ 184,000,000			$ 184,000,000				$ 11,000,000
Finance lease obligations, current					1,000,000			1,000,000				11,000,000
Gain on extinguishment of debt					12,000,000		$ 0	152,000,000	$ (75,000,000)
Commercial paper outstanding					0			0				0
Commercial Paper
Debt Instrument [Line Items]
Debt instrument, face amount					3,500,000,000			$ 3,500,000,000
Debt instrument term								270 days
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Debt extension term				1 year
Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount											$ 1,250,000,000
Repurchased debt principal amount		$ 644,000,000			89,000,000	$ 410,000,000		$ 89,000,000
Discount to par of debt repurchase		38,000,000				147,000,000		11,000,000
Debt instrument, repurchase early tender premium		32,000,000
Debt repurchase, accrued and unpaid interest		6,000,000
Gain on extinguishment of debt		$ 2,000,000			10,000,000	140,000,000
Debt repurchase price					79,000,000	$ 267,000,000		79,000,000
3.625% senior notes due February 1, 2021 \| Senior Notes
Debt Instrument [Line Items]
Current debt outstanding amount					$ 183,000,000			$ 183,000,000
Debt instrument, stated interest rate					3.625%			3.625%		3.625%
Altus credit facility \| Line of Credit
Debt Instrument [Line Items]
Borrowing amount					$ 580,000,000			$ 580,000,000				396,000,000
Altus credit facility \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity				$ 800,000,000
Letters of credit outstanding, amount					0			0				0
Line of credit facility, number of extension options \| contract				2
Line of credit facility, maximum borrowing capacity if adding new lenders				$ 1,500,000,000
Long-term line of credit					580,000,000			580,000,000				396,000,000
Altus credit facility \| Line of Credit \| Letter of Credit
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity				100,000,000
Altus credit facility \| Line of Credit \| Swingline Loan Subfacility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity				$ 100,000,000
4.625 Notes Due 2025 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate											4.625%
Debt instrument, face amount											$ 500,000,000
4.875 Notes Due 2027 \| Senior Notes
Debt Instrument [Line Items]
Debt instrument, stated interest rate											4.875%
Debt instrument, face amount											$ 750,000,000
Apache credit facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, committed amount													$ 4,000,000,000.0
Debt extension term			1 year
Apache credit facility \| Line of Credit
Debt Instrument [Line Items]
Borrowing amount					87,000,000			87,000,000				0
Apache credit facility \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			$ 5,000,000,000.0
Apache credit facility \| Line of Credit \| 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
Letters of credit outstanding, amount										£ 637		$ 0
Subsequent Event \| 3.625% senior notes due February 1, 2021 \| Senior Notes
Debt Instrument [Line Items]
Redemption price, percentage of principal amount	100.00%