Fair Value Measurements (Details) (USD $) In Millions	9 Months Ended
Sep. 30, 2011	Sep. 30, 2011 Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member]
Financial Assets: Crude Oil and Natural Gas Price Swaps		$ 215
Financial Assets: Natural Gas Price Swaps			62
Financial Assets: Natural Gas Swaptions		211	6
Financial Assets: Interest Rate Swap			2
Financial Liabilities: Crude Oil Price Swaps and Natural Gas Basis Swaps			29
Financial Liabilities: Foreign Currency Rate Swap		46	55
Financial Liabilities: Interest Rate Swap		5
Proved Oil and Gas Properties and Other Property, Plant and Equipment Written Down to Fair Value During the Period - Carrying Amount	571
Proved Oil and Gas Properties and Other Property, Plant and Equipment Written Down During the Period - Fair Value at End of Period	180
Impairment Charge for Proved Oil and Gas Properties and Other Property, Plant and Equipment (Pretax)	$ 391

This element represents an interest rate swap agreement included as an asset in the statement of financial position and measured at fair value on a recurring basis.

Name:	eog_FairValueAssetsMeasuredOnRecurringBasisInterestRateSwap
Namespace Prefix:	eog
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This elements represents financial commodity crude oil price swap and natural gas price swap contracts included as an asset in the statement of financial position and measured at fair value on a recurring basis.

+ Details

Name:	eog_FinancialAssetsCrudeOilAndNaturalGasPriceSwaps
Namespace Prefix:	eog
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

This elements represents financial commodity crude oil price swap and natural gas basis swap contracts included as a liability in the statement of financial position and measured at fair value on a recurring basis.

+ Details

Name:	eog_FinancialLiabilitiesCrudeOilPriceSwapsAndNaturalGasBasisSwaps
Namespace Prefix:	eog
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

This element represents an interest rate swap agreement included as a liability in the statement of financial position and measured at fair value on a recurring basis.

+ Details

Name:	eog_FinancialLiabilitiesInterestRateSwaps
Namespace Prefix:	eog
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

The expense recorded to reduce the value of property, plant and equipment to estimated fair value when circumstances indicate such property, plant and equipment has been impaired and 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.

+ Details

Name:	eog_ImpairmentChargeForProvedOilAndGasPropertiesAndOtherPropertyPlantAndEquipment
Namespace Prefix:	eog
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Financial commodity price swap contract which provides the counterparty option to enter into a price swap contract at a later date.

+ Details

Name:	eog_NaturalGasSwaptions
Namespace Prefix:	eog
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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.

+ 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.

+ Details

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

- Definition

This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph a

+ Details

Name:	us-gaap_FairValueAssetsMeasuredOnRecurringBasisDerivativeFinancialInstrumentsAssets
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents contracts related to the exchange of different currencies, including foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into and existing as of the balance sheet date.

+ Details

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