Risk Management Activities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net (Gains) Losses on Mark-to-Market Commodity Derivative Contracts	$ (834,273,000)		$ 166,349,000		$ (393,744,000)
Net Cash Received from Settlements of Crude Oil and Natural Gas Derivative Contracts	34,007,000		116,361,000		711,479,000
Derivatives, Fair Value [Line Items]
Receivable Major Customer Percentage	10.00%		10.00%
Derivatives Assets, Current	465,128,000		8,260,000
Derivative Liabilities, Current	0		127,542,000
Derivative Collateral [Abstract]
Collateral Held on Derivative	278,000,000		0
Collateral Had on Derivaitve	0		0
Crude Oil and Natural Gas Derivative Contracts [Member] | Assets From Price Risk Management Activities [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets, Current	465,000,000	[1]	8,000,000	[1]
Derivative asset, gross assets	477,000,000		18,000,000
Derivative asset, gross liabilities	12,000,000		10,000,000
Crude Oil and Natural Gas Derivative Contracts [Member] | Liabilities From Price Risk Management Activities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current	0	[2]	127,000,000	[2]
Derivative liabilities, gross liabilities	12,000,000		137,000,000
Derivative liabilities, gross assets	12,000,000		10,000,000
Interest Rate Swap [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current	0		1,000,000
Foreign Currency Swap [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current	$ 0		$ 40,000,000
January 1, 2015 through June 30, 2015
Derivative [Line Items]
Volume (Bbld)	47,000	[3]
Derivative Weighted Average Price Crude Oil ($/Bbl)	91.22	[3]
July 1, 2015 through December 31, 2015
Derivative [Line Items]
Volume (Bbld)	10,000
Volumes (Bbld) - Derivative Option Contracts	37,000
Derivative Weighted Average Price Crude Oil ($/Bbl)	89.98
Derivative Weighted Average Price Crude Oil (Options Exercised) ($/Bbl)	91.56
April 2015
Derivative [Line Items]
Volume (MMBtud)	195,000	[4]
Derivative Weighted Average Price Natural Gas ($/MMBtu)	4.49	[4]
March 2015
Derivative [Line Items]
Volume (MMBtud)	225,000	[4]
Derivative Weighted Average Price Natural Gas ($/MMBtu)	4.48	[4]
January 2015 (closed)
Derivative [Line Items]
Volume (MMBtud)	235,000
Derivative Weighted Average Price Natural Gas ($/MMBtu)	4.47
February 2015
Derivative [Line Items]
Volume (MMBtud)	235,000	[4]
Derivative Weighted Average Price Natural Gas ($/MMBtu)	4.47	[4]
May 1, 2015 through December 31, 2015
Derivative [Line Items]
Volume (MMBtud)	175,000	[4]
Derivative Weighted Average Price Natural Gas ($/MMBtu)	4.51	[4]
February 1, 2015 through December 31, 2015 [Member]
Derivative [Line Items]
Volumes (MMBtud) - Derivative Option Contracts	175,000	[4]
Average Price ($/MMBtu) - Derivative Option Contracts	4.51	[4]

[1] The current portion of Assets from Price Risk Management Activities consists of gross assets of $477 million, partially offset by gross liabilities of $12 million, at December 31, 2014 and gross assets of $18 million, partially offset by gross liabilities of $10 million, at December 31, 2013.

[2] The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $12 million, offset by gross assets of $12 million, at December 31, 2014 and gross liabilities of $137 million, partially offset by gross assets of $10 million, at December 31, 2013.

[3] EOG has entered into crude oil derivative contracts which give counterparties the option to extend certain current derivative contracts for additional six-month periods. Options covering a notional volume of 37,000 Bbld are exercisable on June 30, 2015. If the counterparties exercise all such options, the notional volume of EOG's existing crude oil derivative contracts will increase by 37,000 Bbld at an average price of $91.56 per barrel for each month during the period July 1, 2015 through December 31, 2015.

[4] EOG has entered into natural gas derivative contracts which give counterparties the option of entering into derivative contracts at future dates. All such options are exercisable monthly up until the settlement date of each monthly contract. If the counterparties exercise all such options, the notional volume of EOG's existing natural gas derivative contracts will increase by 175,000 MMBtud at an average price of $4.51 per MMBtu for each month during the period February 1, 2015 through December 31, 2015.