Risk Management Activities (Tables)

3 Months Ended

Mar. 31, 2018

Derivatives, Fair Value [Line Items]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The following table sets forth the amounts and classification of EOG's outstanding financial derivative instruments at March 31, 2018 and December 31, 2017.  Certain amounts may be presented on a net basis on the Condensed Consolidated Financial Statements when such amounts are with the same counterparty and subject to a master netting arrangement (in millions):

		Fair Value at
Description	Location on Balance Sheet	March 31, 2018		December 31, 2017
Asset Derivatives
Crude oil and natural gas derivative contracts -
Current portion	Assets from Price Risk Management Activities	$	1	$	8
Noncurrent portion	Other Assets	7		—
Liability Derivatives
Crude oil and natural gas derivative contracts -
Current portion	Liabilities from Price Risk Management Activities (1)	$	84	$	50
Noncurrent portion	Other Liabilities	—		7

(1) The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $117 million, partially offset by gross assets of $33 million at March 31, 2018, and gross liabilities of $55 million, partially offset by gross assets of $5 million at December 31, 2017.

Crude Oil [Member] | Midland Differential Basis Swaps [Member]

Derivatives, Fair Value [Line Items]

Schedule of Derivative Instruments

Presented below is a comprehensive summary of EOG's Midland Differential basis swap contracts for the three months ended March 31, 2018. The weighted average price differential expressed in dollars per barrel ($/Bbl) represents the amount of reduction to Cushing, Oklahoma, prices for the notional volumes expressed in barrels per day (Bbld) covered by the basis swap contracts.

Midland Differential Basis Swap Contracts
	Volume (Bbld)	Weighted Average Price Differential ($/Bbl)
2018
January 1, 2018 through April 30, 2018 (closed)	15,000	$	1.063
May 1, 2018 through December 31, 2018	15,000	1.063
2019
January 1, 2019 through December 31, 2019	20,000	$	1.075

Crude Oil [Member] | Gulf Coast Differential Basis Swap [Member]

Derivatives, Fair Value [Line Items]

Schedule of Derivative Instruments

Presented below is a comprehensive summary of EOG's Gulf Coast Differential basis swap contracts for the three months ended March 31, 2018. The weighted average price differential expressed in $/Bbl represents the amount of addition to Cushing, Oklahoma, prices for the notional volumes expressed in Bbld covered by the basis swap contracts.

Gulf Coast Differential Basis Swap Contracts
	Volume (Bbld)	Weighted Average Price Differential ($/Bbl)
2018
January 1, 2018 through April 30, 2018 (closed)	37,000	$	3.818
May 1, 2018 through December 31, 2018	37,000	3.818

Crude Oil [Member] | Price Swaps [Member]

Derivatives, Fair Value [Line Items]

Schedule of Derivative Instruments

Presented below is a comprehensive summary of EOG's crude oil price swap contracts for the three months ended March 31, 2018, with notional volumes expressed in Bbld and prices expressed in $/Bbl.

Crude Oil Price Swap Contracts
	Volume (Bbld)	Weighted Average Price ($/Bbl)
2018
January 1, 2018 through March 31, 2018 (closed)	134,000	$	60.04
April 1, 2018 through December 31, 2018	134,000	60.04

Natural Gas [Member] | Price Swaps [Member]

Derivatives, Fair Value [Line Items]

Schedule of Derivative Instruments

Presented below is a comprehensive summary of EOG's natural gas price swap contracts for the three months ended March 31, 2018, with notional volumes expressed in million British thermal units (MMBtu) per day (MMBtud) and prices expressed in dollars per MMBtu ($/MMBtu).

Natural Gas Price Swap Contracts
	Volume (MMBtud)	Weighted Average Price ($/MMBtu)
2018
March 1, 2018 through April 30, 2018 (closed)	35,000	$	3.00
May 1, 2018 through November 30, 2018	35,000	3.00

Natural Gas [Member] | Options [Member]

Derivatives, Fair Value [Line Items]

Schedule of Derivative Instruments

Presented below is a comprehensive summary of EOG's natural gas call and put option contracts for the three months ended March 31, 2018, with notional volumes expressed in MMBtud and prices expressed in $/MMBtu.

Natural Gas Option Contracts
	Call Options Sold			Put Options Purchased
	Volume (MMBtud)	Weighted Average Price ($/MMBtu)		Volume (MMBtud)	Weighted Average Price ($/MMBtu)
2018
March 1, 2018 through April 30, 2018 (closed)	120,000	$	3.38	96,000	$	2.94
May 1, 2018 through November 30, 2018	120,000	3.38		96,000	2.94