Risk Management Activities (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 bbl		Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	$ 329,825,000		$ 465,128,000
Derivative Collateral [Abstract]
Collateral Held on Derivative	125,000,000		278,000,000
Collateral Had on Derivaitve	0		0
Crude Oil and Natural Gas Derivative Contracts [Member] | Liabilities From Price Risk Management Activities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current	0	[1]	0	[1]
Derivative Assets, Current, Gross	9,000,000	[1]	12,000,000	[1]
Derivative Liabilities, Current, Gross	9,000,000	[1]	12,000,000	[1]
Crude Oil and Natural Gas Derivative Contracts [Member] | Assets From Price Risk Management Activities [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	330,000,000	[2]	465,000,000	[2]
Derivative Assets, Current, Gross	339,000,000	[2]	477,000,000	[2]
Derivative Liabilities, Current, Gross	$ 9,000,000	[2]	$ 12,000,000	[2]
Crude Oil Derivative Contracts January - March (closed) [Member]
Derivative [Line Items]
Volume (Bbld)	47,000
Derivative Weighted Average Price Crude Oil ($/Bbl)	91.22
Crude Oil Derivative Contracts April - June [Member]
Derivative [Line Items]
Volume (Bbld)	47,000	[3]
Derivative Weighted Average Price Crude Oil ($/Bbl)	91.22	[3]
Crude Oil Derivative Contracts July - December [Member]
Derivative [Line Items]
Volume (Bbld)	10,000	[3]
Derivative Weighted Average Price Crude Oil ($/Bbl)	89.98	[3]
Volumes (Bbld) - Derivative Swaption Contracts	37,000	[3]
Average Price ($/Bbl) - Derivative Swaption Contracts	91.56	[3]
Natural Gas Derivative Contracts January - February (closed) [Member]
Derivative [Line Items]
Volume (MMBtud)	235,000
Derivative Weighted Average Price Natural Gas ($/MMBtu)	4.47
Natural Gas Derivative Contracts March (closed) [Member]
Derivative [Line Items]
Volume (MMBtud)	225,000
Derivative Weighted Average Price Natural Gas ($/MMBtu)	4.48
Natural Gas Derivative Contracts April (closed) [Member]
Derivative [Line Items]
Volume (MMBtud)	195,000
Derivative Weighted Average Price Natural Gas ($/MMBtu)	4.49
Natural Gas Derivative Contracts May [Member]
Derivative [Line Items]
Volume (MMBtud)	235,000	[4]
Derivative Weighted Average Price Natural Gas ($/MMBtu)	4.13	[4]
Natural Gas Derivative Contracts June [Member]
Derivative [Line Items]
Volume (MMBtud)	275,000	[4]
Derivative Weighted Average Price Natural Gas ($/MMBtu)	3.97	[4]
Natural Gas Derivative Contracts July [Member]
Derivative [Line Items]
Volume (MMBtud)	275,000	[4]
Derivative Weighted Average Price Natural Gas ($/MMBtu)	3.98	[4]
Natural Gas Derivative Contracts August - December [Member]
Derivative [Line Items]
Volume (MMBtud)	175,000	[4]
Derivative Weighted Average Price Natural Gas ($/MMBtu)	4.51	[4]
Natural Gas Derivative Contracts May - December [Domain]
Derivative [Line Items]
Volumes (MMBtud) - Options Contracts	175,000	[4]
Average Price ($/MMBtu) - Derivative Options Contracts	4.51	[4]

[1] The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $9 million, offset by gross assets of $9 million at March 31, 2015, and gross liabilities of $12 million, offset by gross assets of $12 million at December 31, 2014.

[2] The current portion of Assets from Price Risk Management Activities consists of gross assets of $339 million, partially offset by gross liabilities of $9 million at March 31, 2015, and gross assets of $477 million, partially offset by gross liabilities of $12 million at December 31, 2014.

[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 May 1, 2015 through December 31, 2015.