Stockholder's Equity (Details) - $ / shares			12 Months Ended
		Feb. 25, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
An aggregate maximum of shares of common stock authorized for repurchase			10,000,000
Remaining shares available for purchase under share repurchase authorization			6,386,200
Dividends Common Stock Declared Per Share		$ 0.375	$ 0.2875	$ 0.22	$ 0.1850
Dividends Payable, Amount Per Share After Increase		$ 0.4125	$ 0.375	$ 0.2875	$ 0.22	$ 0.1675
Common Stock, Shares Authorized			1,280,000,000	1,280,000,000
Common Stock Activity [Line Items]
Beginning Balance (in shares)			582,213,016
Ending Balance (in shares)			583,694,850	582,213,016
Preferred Stock, Shares Outstanding			0
Common Shares, Outstanding [Member]
Common Stock Activity [Line Items]
Beginning Balance (in shares)			581,914,000	580,023,000	578,477,000
Common Stock Issued Under Stock-Based Compensation Plans (in shares)			1,482,000	1,688,000	1,580,000
Treasury Stock Purchased (1) (in shares)	[1]		(389,000)	(310,000)	(539,000)
Common Stock Issued Under Employee Stock Purchase Plan (in shares)			377,000	223,000	180,000
Treasury Stock Issued Under Stock-Based Compensation Plans (in shares)			187,000	290,000	325,000
Ending Balance (in shares)			583,571,000	581,914,000	580,023,000	578,477,000
Common Shares, Treasury [Member]
Common Stock Activity [Line Items]
Beginning Balance (in shares)			(299,000)	(385,000)	(351,000)
Common Stock Issued Under Stock-Based Compensation Plans (in shares)			0	0	0
Treasury Stock Purchased (1) (in shares)	[1]		(389,000)	(310,000)	(539,000)
Common Stock Issued Under Employee Stock Purchase Plan (in shares)			377,000	106,000	180,000
Treasury Stock Issued Under Stock-Based Compensation Plans (in shares)			187,000	290,000	325,000
Ending Balance (in shares)			(124,000)	(299,000)	(385,000)	(351,000)
Common Shares, Issued [Member]
Common Stock Activity [Line Items]
Beginning Balance (in shares)			582,213,000	580,408,000	578,828,000
Common Stock Issued Under Stock-Based Compensation Plans (in shares)			1,482,000	1,688,000	1,580,000
Treasury Stock Purchased (1) (in shares)	[1]		0	0	0
Common Stock Issued Under Employee Stock Purchase Plan (in shares)			0	117,000	0
Treasury Stock Issued Under Stock-Based Compensation Plans (in shares)			0	0	0
Ending Balance (in shares)			583,695,000	582,213,000	580,408,000	578,828,000

[1] Represents shares that were withheld by or returned to EOG (i) in satisfaction of tax withholding obligations that arose upon the exercise of employee stock options or SARs or the vesting of restricted stock, restricted stock unit or performance unit grants or (ii) in payment of the exercise price of employee stock options.