Stockholder's Equity (Details) - $ / shares		9 Months Ended	12 Months Ended
		Oct. 04, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
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
Common Stock, Shares Authorized			1,280,000,000	640,000,000
Common Stock, Dividends, Per Share, Cash Paid			$ 0.1675	$ 0.1675	$ 0.1675
Percentage increase of cash dividend on common stock			10.00%
Dividends Payable, Amount Per Share After Increase			$ 0.1850
Common Stock Activity [Line Items]
Balance (in shares)			576,950,272
Stock Issued During Period, Shares, Acquisitions (in shares)		25,000,000	25,000,000
Balance (in shares)			578,827,768	576,950,272
Preferred Stock, Shares Outstanding			0
Common Shares, Outstanding [Member]
Common Stock Activity [Line Items]
Balance (in shares)		549,859,000	576,700,000	549,859,000	548,295,000
Common Stock Issued Under Stock-Based Compensation Plans (in shares)			1,878,000	1,500,000	1,019,000
Treasury Stock Purchased (1) (in shares)	[1]		(686,000)	(922,000)	(581,000)
Common Stock Issued Under Employee Stock Purchase Plan (in shares)			180,000	212,000	225,000
Treasury Stock Issued Under Stock-Based Compensation Plans (in shares)			405,000	847,000	901,000
Stock Issued During Period, Shares, Acquisitions (in shares)				25,204,000
Balance (in shares)			578,477,000	576,700,000	549,859,000
Common Shares, Treasury [Member]
Common Stock Activity [Line Items]
Balance (in shares)		(292,000)	(250,000)	(292,000)	(733,000)
Common Stock Issued Under Stock-Based Compensation Plans (in shares)			0	0	0
Treasury Stock Purchased (1) (in shares)	[1]		(686,000)	(922,000)	(581,000)
Common Stock Issued Under Employee Stock Purchase Plan (in shares)			180,000	117,000	121,000
Treasury Stock Issued Under Stock-Based Compensation Plans (in shares)			405,000	847,000	901,000
Stock Issued During Period, Shares, Acquisitions (in shares)				0
Balance (in shares)			(351,000)	(250,000)	(292,000)
Common Shares, Issued [Member]
Common Stock Activity [Line Items]
Balance (in shares)		550,151,000	576,950,000	550,151,000	549,028,000
Common Stock Issued Under Stock-Based Compensation Plans (in shares)			1,878,000	1,500,000	1,019,000
Treasury Stock Purchased (1) (in shares)	[1]		0	0	0
Common Stock Issued Under Employee Stock Purchase Plan (in shares)			0	95,000	104,000
Treasury Stock Issued Under Stock-Based Compensation Plans (in shares)			0	0	0
Stock Issued During Period, Shares, Acquisitions (in shares)				25,204,000
Balance (in shares)			578,828,000	576,950,000	550,151,000

[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, performance stock or performance unit grants or (ii) in payment of the exercise price of employee stock options.