Stockholder's Equity (Details) - $ / shares		9 Months Ended	12 Months Ended
		Oct. 04, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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			$ 0.1850	$ 0.1675
Dividends Payable, Amount Per Share After Increase			$ 0.22	$ 0.1850
Percentage increase of cash dividend on common stock			19.00%	10.00%
Common Stock, Shares Authorized			1,280,000,000	1,280,000,000	640,000,000
Common Stock, Dividends, Per Share, Cash Paid					$ 0.1675
Common Stock Activity [Line Items]
Balance (in shares)			578,827,768
Stock Issued During Period, Shares, Acquisitions (in shares)		25,000,000
Balance (in shares)			580,408,117	578,827,768
Preferred Stock, Shares Outstanding			0
Common Shares, Outstanding [Member]
Common Stock Activity [Line Items]
Balance (in shares)		549,859,000	578,477,000	576,700,000	549,859,000
Stock Issued During Period, Shares, Acquisitions (in shares)					25,204,000
Common Stock Issued Under Stock-Based Compensation Plans (in shares)			1,580,000	1,878,000	1,500,000
Treasury Stock Purchased (1) (in shares)	[1]		(539,000)	(686,000)	(922,000)
Common Stock Issued Under Employee Stock Purchase Plan (in shares)			180,000	180,000	212,000
Treasury Stock Issued Under Stock-Based Compensation Plans (in shares)			325,000	405,000	847,000
Balance (in shares)			580,023,000	578,477,000	576,700,000
Common Shares, Treasury [Member]
Common Stock Activity [Line Items]
Balance (in shares)		(292,000)	(351,000)	(250,000)	(292,000)
Stock Issued During Period, Shares, Acquisitions (in shares)					0
Common Stock Issued Under Stock-Based Compensation Plans (in shares)			0	0	0
Treasury Stock Purchased (1) (in shares)	[1]		(539,000)	(686,000)	(922,000)
Common Stock Issued Under Employee Stock Purchase Plan (in shares)			180,000	180,000	117,000
Treasury Stock Issued Under Stock-Based Compensation Plans (in shares)			325,000	405,000	847,000
Balance (in shares)			(385,000)	(351,000)	(250,000)
Common Shares, Issued [Member]
Common Stock Activity [Line Items]
Balance (in shares)		550,151,000	578,828,000	576,950,000	550,151,000
Stock Issued During Period, Shares, Acquisitions (in shares)					25,204,000
Common Stock Issued Under Stock-Based Compensation Plans (in shares)			1,580,000	1,878,000	1,500,000
Treasury Stock Purchased (1) (in shares)	[1]		0	0	0
Common Stock Issued Under Employee Stock Purchase Plan (in shares)			0	0	95,000
Treasury Stock Issued Under Stock-Based Compensation Plans (in shares)			0	0	0
Balance (in shares)			580,408,000	578,828,000	576,950,000

[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.