Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2014	Dec. 31, 2013
Financial Assets:
Financial Assets: Natural Gas Options/Swaptions	$ 32	$ 8
Financial Assets: Crude Oil Swaps	84
Financial Assets: Crude Oil Options/Swaptions	23
Financial Liabilities:
Financial Liabilities: Crude Oil Swaps		17
Financial Liabilities: Crude Oil Options/Swaptions		110
Financial Liabilities: Foreign Currency Rate Swap		40
Financial Liabilities: Interest Rate Swap		1
Proved Oil and Gas Properties and Other Assets Carrying Amount	152
Proved Oil and Gas Properties and Other Assets Written Down During the Period - Fair value at End of Period	68
Pretax Impairment Charges for Proved Oil and Gas Properties and Other Assets	84
Pretax Impairment Charges for Proved Oil and Gas Properties and Other Assets, in which EOG utilized an accepted offer from a third-party purchaser	58
Aggregate Principal Amount of Current and Long-Term Debt	5,890	5,890
Estimated Fair Value of Debt	6,243	6,222
Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Financial Assets: Natural Gas Options/Swaptions	0	0
Financial Assets: Crude Oil Swaps	0
Financial Assets: Crude Oil Options/Swaptions	0
Financial Liabilities:
Financial Liabilities: Crude Oil Swaps		0
Financial Liabilities: Crude Oil Options/Swaptions		0
Financial Liabilities: Foreign Currency Rate Swap		0
Financial Liabilities: Interest Rate Swap		0
Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Financial Assets: Natural Gas Options/Swaptions	32	8
Financial Assets: Crude Oil Swaps	84
Financial Assets: Crude Oil Options/Swaptions	23
Financial Liabilities:
Financial Liabilities: Crude Oil Swaps		17
Financial Liabilities: Crude Oil Options/Swaptions		110
Financial Liabilities: Foreign Currency Rate Swap		40
Financial Liabilities: Interest Rate Swap		1
Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Financial Assets: Natural Gas Options/Swaptions	0	0
Financial Assets: Crude Oil Swaps	0
Financial Assets: Crude Oil Options/Swaptions	0
Financial Liabilities:
Financial Liabilities: Crude Oil Swaps		0
Financial Liabilities: Crude Oil Options/Swaptions		0
Financial Liabilities: Foreign Currency Rate Swap		0
Financial Liabilities: Interest Rate Swap		$ 0

Financial Assets: Crude Oil Options/Swaptions

No definition available.

Name:	eog_FinancialAssetsCrudeOilOptionsSwaptions
Namespace Prefix:	eog_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value, after the effects of master netting arrangements, pertaining to Financial Assets: Natural Gas Options/Swaptions.

+ References

No definition available.

+ Details

Name:	eog_FinancialAssetsNaturalGasOptionsSwaptions
Namespace Prefix:	eog_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value, after the effects of master netting arrangements, related to Financial Liabilities: Crude Oil Options/Swaptions.

+ References

No definition available.

+ Details

Name:	eog_FinancialLiabilitiesCrudeOilOptionsSwaptions
Namespace Prefix:	eog_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties as the estimate of future successful production from these properties is reduced.

+ References

No definition available.

+ Details

Name:	eog_ImpairmentChargeForShallowNaturalGasAssetsSoldInCanada
Namespace Prefix:	eog_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The expense recorded to reduce the value of oil and gas assets consisting of proved properties as the estimate of future successful production from these properties is reduced.

+ References

No definition available.

+ Details

Name:	eog_PretaxImpairmentChargeForProvedOilAndGasPropertiesForWhichThirdPartyOfferWasUtilized
Namespace Prefix:	eog_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Net dollar amount capitalized on balance sheet representing an enterprise's interests in proved crude oil (including condensate and natural gas liquids) and/or natural gas properties.

+ References

No definition available.

+ Details

Name:	eog_ProvedOilAndGasPropertyCarryingAmount
Namespace Prefix:	eog_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of proved oil and gas property and other property, plant and equipment as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	eog_ProvedOilAndGasPropertyFairValue
Namespace Prefix:	eog_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 3: 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

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
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

+ Details

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

- Definition

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313

+ Details

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

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

+ Details

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

- Definition

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

+ Details

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

- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

+ References

+ Details

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

- Details

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