Risk Management Activities (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Derivative [Line Items]
Subsidiary debt interest rate (in hundredths)	4.75%			4.75%
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	$ 44,484,000			$ 44,484,000			$ 166,135,000
Derivative Liabilities, Current	174,648,000			174,648,000			7,617,000
Foreign Currency Exchange Rate Derivative [Abstract]
After-Tax Net Impact Other Comprehensive Income Increase (Decrease) From The Foreign Currency Swap	1,500,000		1,100,000	2,500,000		1,700,000
Interest Rate Derivative [Abstract]
Interest Rate Swap, Notional Amount	350,000,000			350,000,000
After-Tax Net Impact Other Comprehensive Income Increase (Decrease) From Interest Rate Swap	400,000		(200,000)	1,300,000		(400,000)
Derivative Collateral [Abstract]
Collateral Held on Derivative	0			0			6,000,000
Collateral Had on Derivaitve	2,000,000			2,000,000			0
Crude Oil and Natural Gas Derivative Contracts [Member] | Assets From Price Risk Management Activities [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Current	45,000,000	[1]		45,000,000	[1]		166,000,000	[1]
Derivative Assets, Current, Gross	47,000,000			47,000,000			271,000,000
Derivative Liabilities, Current, Gross	2,000,000			2,000,000			105,000,000
Crude Oil and Natural Gas Derivative Contracts [Member] | Liabilities From Price Risk Management Activities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current	175,000,000	[2]		175,000,000	[2]		8,000,000	[2]
Derivative Assets, Current, Gross	2,000,000			2,000,000			105,000,000
Derivative Liabilities, Current, Gross	177,000,000			177,000,000			113,000,000
Crude Oil and Natural Gas Derivative Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Other Assets	3,000,000	[3]		3,000,000	[3]		0	[3]
Derivative Assets, Noncurrent, Gross	4,000,000			4,000,000
Derivative Liabilities, Noncurrent, Gross	1,000,000			1,000,000
Crude Oil and Natural Gas Derivative Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities	0	[4]		0	[4]		13,000,000	[4]
Derivative Assets, Noncurrent, Gross	1,000,000			1,000,000
Derivative Liabilities, Noncurrent, Gross	1,000,000			1,000,000			13,000,000
Foreign Currency Swap [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current	46,000,000			46,000,000			0
Foreign Currency Swap [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities	0			0			55,000,000
Interest Rate Swap [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current	2,000,000			2,000,000			0
Interest Rate Swap [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities	$ 0			$ 0			$ 4,000,000
Crude Oil Derivative Contracts January (closed) [Member]
Derivative [Line Items]
Volume (Bbld)				101,000
Derivative Weighted Average Price Crude Oil ($/Bbl)				99.29
Crude Oil Derivative Contracts February - April (closed) [Member]
Derivative [Line Items]
Volume (Bbld)				109,000
Derivative Weighted Average Price Crude Oil ($/Bbl)				99.17
Crude Oil Derivative Contracts May - June (closed) [Member]
Derivative [Line Items]
Volume (Bbld)				101,000
Derivative Weighted Average Price Crude Oil ($/Bbl)				99.29
Crude Oil Derivative Contracts July (closed) [Member]
Derivative [Line Items]
Volume (Bbld)				111,000
Derivative Weighted Average Price Crude Oil ($/Bbl)				98.25
Crude Oil Derivative Contracts August - September (closed) [Member]
Derivative [Line Items]
Volume (Bbld)				126,000
Derivative Weighted Average Price Crude Oil ($/Bbl)				98.80
Crude Oil Derivative Contracts October - December [Member]
Derivative [Line Items]
Volume (Bbld)				126,000	[5]
Derivative Weighted Average Price Crude Oil ($/Bbl)				98.80	[5]
Crude Oil Derivative Contracts Year Two January - March [Member]
Derivative [Line Items]
Volume (Bbld)				103,000	[6]
Derivative Weighted Average Price Crude Oil ($/Bbl)				96.48	[6]
Crude Oil Derivative Contracts Year Two January - June [Member]
Derivative [Line Items]
Volumes (Bbld) - Derivative Option Contracts				64,000
Average Price ($/Bbl) - Derivative Option Contracts				99.58
Crude Oil Derivative Contracts Year Two April - June [Member]
Derivative [Line Items]
Volume (Bbld)				93,000	[6]
Derivative Weighted Average Price Crude Oil ($/Bbl)				96.47	[6]
Crude Oil Derivative Contracts Year Two July - December [Member]
Derivative [Line Items]
Volumes (Bbld) - Derivative Option Contracts				93,000
Average Price ($/Bbl) - Derivative Option Contracts				96.47
Crude Oil Derivative Contracts Year Two April - December [Member]
Derivative [Line Items]
Volumes (Bbld) - Derivative Option Contracts				10,000
Average Price ($/Bbl) - Derivative Option Contracts				96.60
Crude Oil Derivative Contracts Year Three January - June [Member]
Derivative [Line Items]
Volumes (Bbld) - Derivative Option Contracts				5,000
Average Price ($/Bbl) - Derivative Option Contracts				95.43
Natural Gas Derivative Contracts January - April (closed) [Member]
Derivative [Line Items]
Volume (MMBtud)				150,000
Derivative Weighted Average Price Natural Gas ($/MMBtu)				4.79
Natural Gas Derivative Contracts May - October (closed) [Member]
Derivative [Line Items]
Volume (MMBtud)				200,000
Derivative Weighted Average Price Natural Gas ($/MMBtu)				4.72
Natural Gas Derivative Contracts November - December [Member]
Derivative [Line Items]
Volume (MMBtud)				150,000	[7]
Derivative Weighted Average Price Natural Gas ($/MMBtu)				4.79	[7]
Volumes (MMBtud) - Derivative Option Contracts				150,000
Average Price ($/MMBtu) - Derivative Option Contracts				4.79
Natural Gas Derivative Contracts Year Two January - December [Member]
Derivative [Line Items]
Volume (MMBtud)				170,000	[8]
Derivative Weighted Average Price Natural Gas ($/MMBtu)				4.54	[8]
Volumes (MMBtud) - Derivative Option Contracts				320,000
Average Price ($/MMBtu) - Derivative Option Contracts				4.66

[1] The current portion of Assets from Price Risk Management Activities consists of gross assets of $47 million, partially offset by gross liabilities of $2 million at September 30, 2013 and gross assets of $271 million, partially offset by gross liabilities of $105 million at December 31, 2012.

[2] The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $177 million, partially offset by gross assets of $2 million at September 30, 2013 and gross liabilities of $113 million, partially offset by gross assets of $105 million at December 31, 2012.

[3] The noncurrent portion of Assets from Price Risk Management Activities consists of gross assets of $4 million, partially offset by gross liabilities of $1 million at September 30, 2013.

[4] The noncurrent portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $1 million, partially offset by gross assets of $1 million at September 30, 2013 and gross liabilities of $13 million at December 31, 2012.

[5] EOG has entered into crude oil derivative contracts which give counterparties the option to extend certain current derivative contracts for an additional six-month period. Options covering a notional volume of 64,000 Bbld are exercisable on December 31, 2013. If the counterparties exercise all such options, the notional volume of EOG's existing crude oil derivative contracts will increase by 64,000 Bbld at an average price of $99.58 per barrel for each month during the period January 1, 2014 through June 30, 2014.

[6] EOG has entered into crude oil derivative contracts which give counterparties the option to extend certain current derivative contracts for additional six-month and nine-month periods. Options covering a notional volume of 10,000 Bbld are exercisable on or about March 31, 2014. If the counterparties exercise all such options, the notional volume of EOG's existing crude oil derivative contracts will increase by 10,000 Bbld at an average price of $96.60 per barrel for each month during the period April 1, 2014 through December 31, 2014. Options covering a notional volume of 93,000 Bbld are exercisable on or about June 30, 2014. If the counterparties exercise all such options, the notional volume of EOG's existing crude oil derivative contracts will increase by 93,000 Bbld at an average price of $96.47 per barrel for each month during the period July 1, 2014 through December 31, 2014. In addition, in connection with the crude oil derivative contracts settled in September 2013, counterparties retain the option to enter into derivative contracts on December 31, 2014. If the counterparties exercise all such options, the notional volume of EOG's existing crude oil derivative contracts will increase by 5,000 Bbld at an average price of $95.43 per barrel for each month during the period January 1, 2015 through June 30, 2015.

[7] EOG has entered into natural gas derivative contracts which give counterparties the option of entering into derivative contracts at future dates. Such options are exercisable monthly up until the settlement date of each monthly contract. For the period November 1, 2013 through December 31, 2013, if the counterparties exercise all such options, the notional volume of EOG's existing natural gas derivative contracts will increase by 150,000 MMBtud at an average price of $4.79 per MMBtu for each month during that period.

[8] EOG has entered into natural gas derivative contracts which give counterparties the option of entering into derivative contracts at future dates. Additionally, in connection with certain natural gas derivative contracts settled in July 2012, counterparties retain an 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 320,000 MMBtud at an average price of $4.66 per MMBtu for each month during the period January 1, 2014 through December 31, 2014.