Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Financial Assets:
Financial Assets: Natural Gas Options/Swaptions	$ 86	$ 100
Financial Assets: Crude Oil Swaps	103us-gaap_DerivativeAssets	121us-gaap_DerivativeAssets
Financial Assets: Crude Oil Options/Swaptions	141	244
Proved Oil and Gas Properties and Other Assets Carrying Amount	7
Proved Oil and Gas Properties and Other Assets Written Down During the Period - Fair value at End of Period	2eog_ProvedOilAndGasPropertyFairValue
Pretax Impairment Charges for Proved Oil and Gas Properties and Other Assets	5
Aggregate Principal Amount of Current and Long-Term Debt	6,890us-gaap_DebtInstrumentCarryingAmount	5,890us-gaap_DebtInstrumentCarryingAmount
Estimated Fair Value of Debt	7,370us-gaap_DebtInstrumentFairValue	6,242us-gaap_DebtInstrumentFairValue
Fair Value, Inputs, Level 1 [Member]
Financial Assets:
Financial Assets: Natural Gas Options/Swaptions	0	0
Financial Assets: Crude Oil Swaps	0	0
Financial Assets: Crude Oil Options/Swaptions	0	0
Fair Value, Inputs, Level 2 [Member]
Financial Assets:
Financial Assets: Natural Gas Options/Swaptions	86	100
Financial Assets: Crude Oil Swaps	103	121
Financial Assets: Crude Oil Options/Swaptions	141	244
Fair Value, Inputs, Level 3 [Member]
Financial Assets:
Financial Assets: Natural Gas Options/Swaptions	0	0
Financial Assets: Crude Oil Swaps	0	0
Financial Assets: Crude Oil Options/Swaptions	$ 0	$ 0

Financial Assets: Crude Oil Options/Swaptions

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- Definition

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

+ References

No definition available.

+ Details

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- 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

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- 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

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- 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

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- 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 FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

+ Details

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- 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)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=34720828&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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313

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