Debt Instrument, Number

No definition available.

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

- Definition

Extended Financing Agreement Term

+ References

No definition available.

+ Details

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

- 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:	debit
Period Type:	duration

- 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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
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

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

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
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

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

- Definition

Amount, after accumulated amortization, of debt premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

+ Details

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

- Definition

The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

+ Details

Name:	us-gaap_EarlyRepaymentOfSeniorDebt
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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ Details

Name:	us-gaap_LineOfCredit
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

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_CommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
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_DebtInstrumentAxis=apa_CreditFacilityMaturesinJune2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=apa_CreditFacilityMaturesinFebruary2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=apa_SevenPointZeroPercentageNotesDueTwentyEighteenMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=apa_SixPointNinePercentSeniorNotesDueSeptember152018Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=apa_SevenPointSevenFivePercentSeniorNotesDueIn2029Member
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
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DEBT AND FINANCING COSTS - Additional Information (Detail)	1 Months Ended	3 Months Ended			9 Months Ended
	Jan. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Contract	Sep. 30, 2016 USD ($)	Sep. 30, 2017 GBP (£)	Aug. 31, 2017 USD ($)	Nov. 30, 2016 USD ($)
Debt Instrument [Line Items]
Letters of credit outstanding, amount \| £							£ 147,500,000
Loss on extinguishment of debt	$ 1,000,000	$ 0		$ 0	$ 1,000,000	$ 0
Commercial Paper
Debt Instrument [Line Items]
Debt instrument, face amount		3,500,000,000.0			$ 3,500,000,000.0
Debt instrument term					270 days
Letter of Credit
Debt Instrument [Line Items]
Number of debt instruments (in contracts) \| Contract					3
Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity		3,500,000,000.0			$ 3,500,000,000.0
Credit Facility Matures in June 2020 \| Letter of Credit
Debt Instrument [Line Items]
Line of credit amount		750,000,000			$ 750,000,000
Credit Facility Matures in June 2020 \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, number of extension options \| Contract					2
Extended financing agreement term					1 year
Credit Facility Matures in February 2020 \| Letter of Credit
Debt Instrument [Line Items]
Debt instrument, face amount \| £							900,000,000
Credit facility maximum borrowing capacity \| £							£ 1,075,000,000.000
Line of credit amount		0			$ 0
Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, face amount		8,580,000,000	$ 8,650,000,000		8,580,000,000
Unsecured Debt \| 7% senior notes due February 1, 2018
Debt Instrument [Line Items]
Debt instrument, face amount		$ 150,000,000			$ 150,000,000
Debt instrument, stated interest rate		7.00%			7.00%		7.00%
Unsecured Debt \| 6.9% senior notes due September 15, 2018
Debt Instrument [Line Items]
Debt instrument, face amount		$ 400,000,000			$ 400,000,000
Debt instrument, stated interest rate		6.90%			6.90%		6.90%
Senior Notes
Debt Instrument [Line Items]
Repurchased face amount of debt	69,000,000		181,000,000
Senior notes purchased and canceled	71,000,000		182,000,000
Debt instrument, premium amount	$ 1,000,000		$ 500,000
Senior Notes \| 7.75% Senior Notes Due In 2029
Debt Instrument [Line Items]
Debt instrument, face amount								$ 300,000,000
Debt instrument, stated interest rate								7.75%
Maximum \| Credit Facility Matures in June 2020 \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility aggregate commitment amount					$ 4,500,000,000.0
Maximum \| Senior Notes
Debt Instrument [Line Items]
Repurchased face amount of debt									$ 250,000,000