DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Instruments (Details) MBbls in Thousands, £ in Millions	6 Months Ended
Jun. 30, 2020 GBP (£) $ / bbl Counterparty MBbls
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of derivative counterparties \| Counterparty	11
Fixed Price Swaps \| July—September 2020 \| Crude Oil \| NYMEX WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	2,208
Derivative, weighted average fixed price	26.65
Fixed Price Swaps \| July—September 2020 \| Crude Oil \| Dated Brent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	2,300
Derivative, weighted average fixed price	29.75
Collars \| July—September 2020 \| Crude Oil \| NYMEX WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	2,208
Derivative, average floor sold price	20.00
Derivative average floor purchased price	25.00
Derivative, weighted average ceiling price (USD per bbl)	38.83
Collars \| July—September 2020 \| Crude Oil \| Dated Brent
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	874
Derivative, average floor sold price	20.00
Derivative average floor purchased price	25.00
Derivative, weighted average ceiling price (USD per bbl)	43.66
Collars \| October—December 2020 \| Crude Oil \| NYMEX WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	1,748
Derivative, average floor sold price	15.00
Derivative average floor purchased price	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, volume \| MBbls	1,518
Derivative, average floor sold price	15.00
Derivative average floor purchased price	20.00
Derivative, weighted average ceiling price (USD per bbl)	51.63
Collars \| January—December 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, volume \| MBbls	828
Weighted average price differential	0.20
Basis Swap Purchased \| July—December 2020 \| Crude Oil \| Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	0
Weighted average price differential	0
Basis Swap Purchased \| April to December 2021 \| Crude Oil \| Nymex Henry Hub/Waha
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	29,795
Derivative, weighted average strike price (USD per bbl)	(0.43)
Basis Swap Purchased \| January to December 2022 \| Crude Oil \| Nymex Henry Hub/Waha
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	36,500
Derivative, weighted average strike price (USD per bbl)	(0.46)
Basis Swap Sold \| October—December 2020 \| Crude Oil \| Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	0
Weighted average price differential	0
Basis Swap Sold \| July—December 2020 \| Crude Oil \| Midland-WTI/Cushing-WTI
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	13,432
Weighted average price differential	(2.15)
Basis Swap Sold \| April to December 2021 \| Crude Oil \| Nymex Henry Hub/HSC
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	29,795
Derivative, weighted average strike price (USD per bbl)	(0.07)
Basis Swap Sold \| January to December 2022 \| Crude Oil \| Nymex Henry Hub/HSC
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, nonmonetary notional amount, volume \| MBbls	36,500
Derivative, weighted average strike price (USD per bbl)	(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

The average strike price on the group of price risk option contracts such as put options or call options.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAveragePriceRiskOptionStrikePrice
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 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

- Definition

Average fixed price related to the group of price risk swap derivatives.

+ References

No definition available.

+ Details

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

- Details

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

- Details

Name:	apa_ProductionPeriodAxis=apa_JulySeptember2020Member
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:	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:	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_ApriltoDecember2020Member
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:	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: