Employee Benefit Plans (Details)			12 Months Ended
		Feb. 27, 2020 shares	Dec. 31, 2019 USD ($) $ / shares shares		Dec. 31, 2018 USD ($) $ / shares shares		Dec. 31, 2017 USD ($) $ / shares shares	Feb. 19, 2020 USD ($)
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Subsidiary guarantees demand for payment | $								$ 0
Common Shares Available for Grant			6,800,000
Share-based Payment Arrangement, Expense, Tax Benefit | $			$ (1,000,000)		$ 20,000,000		$ 32,000,000
Compensation expense related to the company's stock-based compensation plans | $			$ 174,738,000		155,337,000		133,849,000
Stock Options and Sars [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Maximum term of stock options and SARs granted			7 years
Share-based Compensation Expense Related To Stock Options, SAR and ESPP Grants | $			$ 63,000,000		60,000,000		56,000,000
Stock Options/SARs Vested or Expected to Vest (in shares)			9,100,000
Weighted average grant price for stock options/SARs vested or expected to vest (per share) | $ / shares			$ 94.52
Intrinsic value of stock options/SARs vested or expected to vest | $			$ 29,100,000
Weighted Average Remaining Contractual Life for Stock Options/SARs Vested or Expected to Vest			4 years 2 months 12 days
Unrecognized compensation expense | $			$ 86,000,000
Weighted average period over which unrecognized compensation expense will be recognized			2 years
Intrinsic Value Of Stock Options/SARs Exercised During The Period | $			$ 14,000,000		$ 118,000,000		$ 95,000,000
Weighted Average Fair Value And Valuation Assumptions Used To Value Stock Options/SARs, ESPP, and Performance Units/Stock-Based Compensation [Abstract]
Weighted Average Fair Value of Grants (price per share) | $ / shares			$ 19.49		$ 33.46		$ 23.95
Expected Volatility (in hundredths)			32.02%		28.23%		28.28%
Risk-Free Interest Rate (in hundredths)			1.69%		2.68%		1.52%
Dividend Yield (in hundredths)			1.39%		0.72%		0.75%
Expected Life (in years)			5 years 1 month 6 days		5 years		5 years 1 month 6 days
Stock Options and SARs Rollforward [Abstract]
Outstanding at January 1 (in shares)			8,310,000		9,103,000		9,850,000
Granted (in shares)			1,965,000		1,906,000		2,274,000
Exercised (1) (in shares)	[1]		(606,000)		(2,493,000)		(2,574,000)
Forfeited (in shares)			(274,000)		(206,000)		(447,000)
Outstanding at December 31 (in shares)			9,395,000		8,310,000		9,103,000
Stock Options/SARs Exercisable at December 31 (in shares)			5,275,000		3,969,000		4,510,000
Weighted Average Grant Price Stock Option and SARs [Rollfoward]
Outstanding at January 1 (in dollars per share) | $ / shares			$ 96.90		$ 83.89		$ 75.53
Granted (in dollars per share) | $ / shares			75.39		126.49		96.27
Exercised (in dollars per share) | $ / shares	[1]		61.43		72.21		61.12
Forfeited (in dollars per share) | $ / shares			102.57		94.43		93.84
Outstanding at December 31 (in dollars per share) | $ / shares			94.53		96.90		83.89
Stock Options/SARs Exercisable at December 31 (in dollars per share) | $ / shares			$ 94.21		85.82		75.76
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items]
Stock Options and SARs Outstanding			9,395,000
Weighted Average Remaining Life for Outstanding Options and SARs			4 years
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares			$ 94.53
Aggregate Intrinsic Value For Outstanding Options and SARs | $	[2]		$ 30,534
Stock Options and SARs Exercisable			5,275,000
Weighted Average Remaining Life For Exercisable Units			3 years
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares			$ 94.21
Aggregate Intrinsic Value For Exercisable Units | $	[2]		$ 13,839
Stock Options and Sars [Member] | Vesting Schedule - First Anniversary [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Vesting Period Increments (in hundredths)			33.00%
Stock Options and Sars [Member] | Vesting Schedule - Second Anniversary [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Vesting Period Increments (in hundredths)			33.00%
Stock Options and Sars [Member] | Vesting Schedule - Third Anniversary [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Vesting Period Increments (in hundredths)			34.00%
ESPP [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Common Shares Available for Grant			2,300,000
Percentage of fair market value at which employees may purchase company stock via the ESPP			85.00%
Maximum Percentage Of Employee Pay Eligible For Contribution To ESPP Percentage			10.00%
Weighted Average Fair Value And Valuation Assumptions Used To Value Stock Options/SARs, ESPP, and Performance Units/Stock-Based Compensation [Abstract]
Weighted Average Fair Value of Grants (price per share) | $ / shares			$ 22.83		$ 25.75		$ 22.20
Expected Volatility (in hundredths)			34.78%		24.59%		27.12%
Risk-Free Interest Rate (in hundredths)			2.27%		1.89%		0.88%
Dividend Yield (in hundredths)			1.04%		0.64%		0.71%
Expected Life (in years)			15 days		15 days		15 days
Stock Options and SARs Rollforward [Abstract]
Approximate Number of Participants			1,998		1,934		1,870
Shares Purchased			224,000		180,000		180,000
Aggregate Purchase Price | $			$ 16,533,000		$ 14,887,000		$ 13,997,000
Restricted Stock and Restricted Stock Units [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation | $			97,000,000		81,000,000		68,000,000
Unrecognized compensation expense | $			$ 202,000,000
Weighted average period over which unrecognized compensation expense will be recognized			1 year 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
Intrinsic value released during the year | $			$ 70,000,000		84,000,000		91,000,000
Aggregate intrinsic value of stock and unit outstanding | $			$ 381,000,000		$ 331,000,000		$ 421,000,000
Number of Shares and Units [Roll Forward]
Outstanding at January 1 (in shares)			3,792,000	[3]	3,905,000	[3]	3,962,000
Granted (in shares)			1,749,000		812,000		1,095,000
Released (in shares)	[4]		(855,000)		(740,000)		(929,000)
Forfeited (in shares)			(140,000)		(185,000)		(223,000)
Outstanding at December 31 (in shares)	[3]		4,546,000		3,792,000		3,905,000
Weighted Average Grant Fair Value [Abstract]
Outstanding at January 1 (in dollars per share) | $ / shares			$ 96.64	[3]	$ 88.57	[3]	$ 79.63
Granted (in dollars per share) | $ / shares			80.01		117.55		97.34
Released (in dollars per share) | $ / shares	[4]		96.93		78.16		61.51
Forfeited (in dollars per share) | $ / shares			97.54		92.12		85.45
Outstanding at December 31 (in dollars per share) | $ / shares	[3]		$ 90.16		$ 96.64		$ 88.57
Performance Units [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Unrecognized compensation expense | $			$ 9,000,000
Weighted average period over which unrecognized compensation expense will be recognized			2 years
Cliff Vesting Period			41 months
Compensation expense related to the company's stock-based compensation plans | $			$ 15,000,000		$ 14,000,000		$ 10,000,000
Intrinsic value released during the year | $			15,000,000		18,000,000		24,000,000
Aggregate intrinsic value of stock and unit outstanding | $			$ 50,000,000		$ 47,000,000		$ 54,000,000
Weighted Average Fair Value And Valuation Assumptions Used To Value Stock Options/SARs, ESPP, and Performance Units/Stock-Based Compensation [Abstract]
Weighted Average Fair Value of Grants (price per share) | $ / shares			$ 79.98		$ 136.74		$ 113.81
Expected Volatility (in hundredths)			29.20%		29.92%		32.19%
Risk-Free Interest Rate (in hundredths)			1.51%		2.85%		1.60%
Number of Shares and Units [Roll Forward]
Outstanding at January 1 (in shares)			539,000	[5]	502,000	[5]	545,000
Granted (in shares)			172,000		113,000		78,000
Granted for Performance Multiple (1) (in shares)	[6]		72,000		72,000		119,000
Released (in shares)	[7]		(185,000)		(148,000)		(240,000)
Forfeited (in shares)			0		0		0
Outstanding at December 31 (in shares)	[5]		598,000	[8]	539,000		502,000
Weighted Average Grant Fair Value [Abstract]
Outstanding at January 1 (in dollars per share) | $ / shares			$ 101.53	[5]	$ 90.96	[5]	$ 80.92
Granted (in dollars per share) | $ / shares			75.09		125.73		96.29
Granted for Performance Multiple (1) (in dollars per share) | $ / shares	[6]		69.43		101.87		84.43
Released (in dollars per share) | $ / shares	[7]		94.63		84.43		66.69
Forfeited (in dollars per share) | $ / shares			0		0		0
Outstanding at December 31 (in dollars per share) | $ / shares	[5]		$ 92.19		$ 101.53		$ 90.96
Performance Units and Performance Stock [Abstract]
Minimum Performance Multiple at the Completion Performance Period			0.00%
Maximum Performance Multiple at the Completion Performance Period			200.00%
Minimum Performance Units and Stock Allowed to be Outstanding			102
Maximum Performance Units and Stock Allowed to be Outstanding			1,094
Performance Multiple Applied at the Completion Period		150.00%	200.00%		200.00%		200.00%
Additional Performance Awards Granted		65,872
Pension Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total pension plan costs | $			$ 51,000,000		$ 43,000,000		$ 37,000,000
Company contributions to foreign pension plans | $			1,000,000		1,000,000		1,000,000
Defined Benefit Plan, Benefit Obligation | $			12,000,000		11,000,000
Fair value of foreign pension plan assets | $			10,000,000		9,000,000
Accrued benefit cost | $			(100,000)		(200,000)
Lease And Well [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Compensation expense related to the company's stock-based compensation plans | $			56,000,000		51,000,000		41,000,000
Gathering And Processing Costs [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Compensation expense related to the company's stock-based compensation plans | $			1,000,000		1,000,000		1,000,000
Exploration Costs [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Compensation expense related to the company's stock-based compensation plans | $			26,000,000		25,000,000		23,000,000
General And Administrative [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Compensation expense related to the company's stock-based compensation plans | $			$ 92,000,000		$ 78,000,000		$ 69,000,000
$ 59.00 to $ 74.99 | Stock Options and Sars [Member]
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items]
Stock Options and SARs Outstanding			979,000
Weighted Average Remaining Life for Outstanding Options and SARs			3 years
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares			$ 69.43
Stock Options and SARs Exercisable			953,000
Weighted Average Remaining Life For Exercisable Units			3 years
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares			$ 69.37
75.00 to 75.99 | Stock Options and Sars [Member]
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items]
Stock Options and SARs Outstanding			1,894,000
Weighted Average Remaining Life for Outstanding Options and SARs			7 years
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares			$ 75.09
Stock Options and SARs Exercisable			8,000
Weighted Average Remaining Life For Exercisable Units			1 year
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares			$ 75.09
76.00 to 95.99 | Stock Options and Sars [Member]
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items]
Stock Options and SARs Outstanding			1,979,000
Weighted Average Remaining Life for Outstanding Options and SARs			3 years
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares			$ 91.35
Stock Options and SARs Exercisable			1,607,000
Weighted Average Remaining Life For Exercisable Units			2 years
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares			$ 90.67
96.00 to 96.99 | Stock Options and Sars [Member]
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items]
Stock Options and SARs Outstanding			1,871,000
Weighted Average Remaining Life for Outstanding Options and SARs			4 years
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares			$ 96.29
Stock Options and SARs Exercisable			1,234,000
Weighted Average Remaining Life For Exercisable Units			4 years
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares			$ 96.29
97.00 to 125.99 | Stock Options and Sars [Member]
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items]
Stock Options and SARs Outstanding			923,000
Weighted Average Remaining Life for Outstanding Options and SARs			2 years
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares			$ 102.72
Stock Options and SARs Exercisable			862,000
Weighted Average Remaining Life For Exercisable Units			2 years
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares			$ 102.20
126.00 to 129.99 | Stock Options and Sars [Member]
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items]
Stock Options and SARs Outstanding			1,749,000
Weighted Average Remaining Life for Outstanding Options and SARs			6 years
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares			$ 127.01
Stock Options and SARs Exercisable			611,000
Weighted Average Remaining Life For Exercisable Units			5 years
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares			$ 127.01

[1] The total intrinsic value of stock options/SARs exercised during the years 2019, 2018 and 2017 was $14 million, $118 million and $95 million, respectively.  The intrinsic value is based upon the difference between the market price of the Common Stock on the date of exercise and the grant price of the stock options/SARs.

[2] Based upon the difference between the closing market price of the Common Stock on the last trading day of the year and the grant price of in-the-money stock options and SARs.

[3] The total intrinsic value of restricted stock and restricted stock units outstanding at December 31, 2019, 2018 and 2017 was $381 million, $331 million and $421 million, respectively.

[4] The total intrinsic value of restricted stock and restricted stock units released during the years ended December 31, 2019, 2018 and 2017 was $70 million, $84 million and $91 million, respectively. The intrinsic value is based upon the closing price of EOG's common stock on the date restricted stock and restricted stock units are released.

[5] The total intrinsic value of Performance Awards outstanding at December 31, 2019, 2018 and 2017 was $50 million, $47 million and $54 million, respectively. The intrinsic value is based on the closing market price of the Common Stock on the last trading day of the year.

[6] Upon completion of the Performance Period for the Performance Awards granted in 2015, 2014 and 2013, a performance multiple of 200% was applied to each of the grants resulting in additional grants of Performance Awards in February 2019, 2018 and 2017.

[7] The total intrinsic value of Performance Awards released during the years ended December 31, 2019, 2018 and 2017 was $15 million, $18 million and $24 million, respectively. The intrinsic value is based upon the closing price of EOG's common stock on the date Performance Awards are released.

[8] Upon the application of the relevant performance multiple at the completion of each of the remaining Performance Periods, a minimum of 102 and a maximum of 1,094 Performance Awards could be outstanding.