DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Instruments (Details) MMBTU in Thousands, MBbls in Thousands, £ in Millions	9 Months Ended
Sep. 30, 2020 GBP (£) $ / MMBTU $ / bbl MMBTU Counterparty MBbls
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative counterparties \| Counterparty	12
Collars \| October—December 2020 \| Crude Oil \| NYMEX WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) \| MBbls	1,748
Derivative, weighted average floor sold price (USD per bbl)	15.00
Derivative, weighted average floor purchased price (USD per bbl)	20.00
Derivative, weighted average ceiling price (USD per bbl)	45.55
Collars \| October—December 2020 \| Crude Oil \| Dated Brent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) \| MBbls	1,518
Derivative, weighted average floor sold price (USD per bbl)	15.00
Derivative, weighted average floor purchased price (USD per bbl)	20.00
Derivative, weighted average ceiling price (USD per bbl)	51.63
Collars \| Calendar year 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, weighted average ceiling price (USD per bbl)	1.38
Derivative, notional amount \| £	£ 13.5
Derivative, weighted average floor price (USD per bbl)	1.26
Basis Swap Purchased \| October—December 2020 \| Crude Oil \| Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) \| MBbls	828
Weighted average price differential	0.20
Basis Swap Purchased \| April—December 2021 \| Natural Gas \| Nymex Henry Hub/IF Waha
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in MMBtu) \| MMBTU	37,580
Weighted average price differential \| $ / MMBTU	(0.43)
Basis Swap Purchased \| January—December 2022 \| Natural Gas \| Nymex Henry Hub/IF Waha
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in MMBtu) \| MMBTU	43,800
Weighted average price differential \| $ / MMBTU	(0.45)
Basis Swap Sold \| October—December 2020 \| Crude Oil \| Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in Mbbls) \| MBbls	6,716
Weighted average price differential	(2.15)
Basis Swap Sold \| April—December 2021 \| Natural Gas \| Nymex Henry Hub/IF HSC
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in MMBtu) \| MMBTU	37,580
Weighted average price differential \| $ / MMBTU	(0.07)
Basis Swap Sold \| January—December 2022 \| Natural Gas \| Nymex Henry Hub/IF HSC
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount (in MMBtu) \| MMBTU	43,800
Weighted average price differential \| $ / MMBTU	(0.08)

Derivative Average Floor Purchased Price

No definition available.

Name:	apa_DerivativeAverageFloorPurchasedPrice
Namespace Prefix:	apa_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Derivative Average Floor Sold Price

+ References

No definition available.

+ Details

Name:	apa_DerivativeAverageFloorSoldPrice
Namespace Prefix:	apa_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Derivative, Number Of Counterparties

+ References

No definition available.

+ Details

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

- Definition

Derivative, Weighted Average Price Differential

+ References

No definition available.

+ Details

Name:	apa_DerivativeWeightedAveragePriceDifferential
Namespace Prefix:	apa_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageCapPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageFloorPrice
Namespace Prefix:	us-gaap_
Data Type:	srt-types:perUnitItemType
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_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix:	us-gaap_
Data Type:	num:energyItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=apa_CollarOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	apa_ProductionPeriodAxis=apa_OctobertoDecember2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_EnergyAxis=srt_CrudeOilMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	apa_DerivativeSettlementIndexAxis=apa_NYMEXWTIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	apa_DerivativeSettlementIndexAxis=apa_DatedBrentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	apa_ProductionPeriodAxis=apa_JanuaryToDecember2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=apa_BasisSwapPurchasedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	apa_DerivativeSettlementIndexAxis=apa_MidlandWTICushingWTIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	apa_ProductionPeriodAxis=apa_ApriltoDecember2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_EnergyAxis=srt_NaturalGasReservesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	apa_DerivativeSettlementIndexAxis=apa_NymexHenryHubWahaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	apa_ProductionPeriodAxis=apa_JanuarytoDecember2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=apa_BasisSwapSoldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	apa_DerivativeSettlementIndexAxis=apa_NymexHenryHubHSCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: