Oil and Gas Exploration and Production Industries Disclosures, Discounted Future Net Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows	$ 146,950,221		$ 123,999,499		$ 94,612,613
Future production costs	(51,633,293)		(50,166,488)		(37,184,832)
Future development costs	(20,494,765)		(18,549,351)		(17,031,731)
Future income taxes	(23,185,714)		(16,416,387)		(11,150,742)
Future net cash flows	51,636,449		38,867,273		29,245,308
Discount to present value at 10% annual rate	(23,713,031)		(17,533,841)		(12,329,836)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves	27,923,418		21,333,432		16,915,472
Annual Rate of Discount to Present Value	10.00%		10.00%		10.00%
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at Beginning of Period	21,333,432		16,915,472		16,225,281
Sales and transfers of oil and gas produced, net of production costs	(9,470,714)		(8,196,380)		(5,888,317)
Net changes in prices and production costs	1,263,177		1,257,853		(301,232)
Extensions, discoveries, additions and improved recovery, net of related costs	8,083,852		5,483,432		6,082,122
Development costs incurred	2,835,100		2,955,900		2,094,600
Revisions of estimated development cost	1,802,735		990,396		2,341,476
Revisions of previous quantity estimates	1,812,532		1,794,198		(3,742,827)
Accretion of discount	2,833,350		2,133,729		2,077,217
Net change in income taxes	(3,651,300)		(2,578,250)		125,065
Purchases of reserves in place	317,785		66,359		69,940
Sales of reserves in place	(478,879)		(140,652)		(913,761)
Changes in timing and other	1,242,348		651,375		(1,254,092)
Balance at End of Period	27,923,418		21,333,432		16,915,472
United States [Member]
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows	144,355,692	[1]	119,644,713	[2]	89,324,274	[3]
Future production costs	(51,112,604)		(49,099,393)		(35,892,997)
Future development costs	(20,270,439)		(17,753,860)		(15,825,040)
Future income taxes	(22,725,618)		(15,763,089)		(10,247,007)
Future net cash flows	50,247,031		37,028,371		27,359,230
Discount to present value at 10% annual rate	(23,542,990)		(17,451,470)		(12,177,896)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves	26,704,041		19,576,901		15,181,334
Per unit price used to calculate future cash inflows - Crude Oil	97.51		105.91		99.78
Per unit price used to calculate future cash inflows - Natural Gas Liquids	34.29		29.42		36.95
Per unit price used to calculate future cash inflows - Natural Gas	3.71		3.50		2.63
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at Beginning of Period	19,576,901		15,181,334		14,375,654
Sales and transfers of oil and gas produced, net of production costs	(8,874,180)		(7,561,343)		(5,192,392)
Net changes in prices and production costs	1,481,668		1,734,058		(393,585)
Extensions, discoveries, additions and improved recovery, net of related costs	8,074,550		5,449,531		5,517,945
Development costs incurred	2,818,800		2,792,400		2,042,300
Revisions of estimated development cost	1,696,916		892,803		1,987,330
Revisions of previous quantity estimates	1,741,918		1,887,062		(3,286,943)
Accretion of discount	2,612,286		1,895,503		1,832,377
Net change in income taxes	(3,743,300)		(2,772,267)		174,418
Purchases of reserves in place	317,785		66,359		64,317
Sales of reserves in place	(189,808)		(140,652)		(869,534)
Changes in timing and other	1,190,505		152,113		(1,070,553)
Balance at End of Period	26,704,041		19,576,901		15,181,334
Canada [Member]
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows	50,116	[1]	1,199,251	[2]	1,816,369	[3]
Future production costs	(25,561)		(540,188)		(751,113)
Future development costs	(32,016)		(529,788)		(813,061)
Future income taxes	0		0		0
Future net cash flows	(7,461)		129,275		252,195
Discount to present value at 10% annual rate	11,217		202,379		146,954
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves	3,756		331,654		399,149
Per unit price used to calculate future cash inflows - Crude Oil	95.11		91.47		84.77
Per unit price used to calculate future cash inflows - Natural Gas Liquids	27.03		40.88		47.80
Per unit price used to calculate future cash inflows - Natural Gas	4.79		2.95		2.22
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at Beginning of Period	331,654		399,149		636,347
Sales and transfers of oil and gas produced, net of production costs	(118,791)		(155,239)		(159,577)
Net changes in prices and production costs	(94,315)		(438,982)		(67,964)
Extensions, discoveries, additions and improved recovery, net of related costs	0		33,901		79,529
Development costs incurred	200		95,400		23,600
Revisions of estimated development cost	63,978		48,906		383,215
Revisions of previous quantity estimates	42,000		(23,915)		(396,408)
Accretion of discount	33,165		39,915		63,635
Net change in income taxes	0		0		0
Purchases of reserves in place	0		0		0
Sales of reserves in place	(289,071)		0		(44,227)
Changes in timing and other	34,936		332,519		(119,001)
Balance at End of Period	3,756		331,654		399,149
Trinidad [Member]
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows	1,615,280	[1]	2,082,195	[2]	2,408,116	[3]
Future production costs	(277,844)		(315,483)		(342,113)
Future development costs	(84,576)		(112,050)		(171,737)
Future income taxes	(460,096)		(603,786)		(691,109)
Future net cash flows	792,764		1,050,876		1,203,157
Discount to present value at 10% annual rate	(110,228)		(174,236)		(242,087)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves	682,536		876,640		961,070
Per unit price used to calculate future cash inflows - Crude Oil	80.60		94.30		94.46
Per unit price used to calculate future cash inflows - Natural Gas	3.71		3.71		3.61
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at Beginning of Period	876,640		961,070		1,184,207
Sales and transfers of oil and gas produced, net of production costs	(473,757)		(473,544)		(526,134)
Net changes in prices and production costs	(12,079)		(12,050)		162,600
Extensions, discoveries, additions and improved recovery, net of related costs	3,113		0		0
Development costs incurred	12,800		67,100		23,500
Revisions of estimated development cost	9,981		(3,539)		(28,835)
Revisions of previous quantity estimates	35,001		(60,419)		(62,285)
Accretion of discount	133,019		147,099		178,298
Net change in income taxes	91,438		56,373		88,853
Purchases of reserves in place	0		0		0
Sales of reserves in place	0		0		0
Changes in timing and other	6,380		194,550		(59,134)
Balance at End of Period	682,536		876,640		961,070
Other International (1) [Member]
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows	929,133	[1],[4]	1,073,340	[2],[4]	1,063,854	[3],[4]
Future production costs	(217,284)	[4]	(211,424)	[4]	(198,609)	[4]
Future development costs	(107,734)	[4]	(153,653)	[4]	(221,893)	[4]
Future income taxes	0	[4]	(49,512)	[4]	(212,626)	[4]
Future net cash flows	604,115	[4]	658,751	[4]	430,726	[4]
Discount to present value at 10% annual rate	(71,030)	[4]	(110,514)	[4]	(56,807)	[4]
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves	533,085	[4]	548,237	[4]	373,919	[4]
Per unit price used to calculate future cash inflows - Crude Oil	94.09		107.36		109.94
Per unit price used to calculate future cash inflows - Natural Gas	5.34		5.67		5.04
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flow Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at Beginning of Period	548,237		373,919		29,073
Sales and transfers of oil and gas produced, net of production costs	(3,986)		(6,254)		(10,214)
Net changes in prices and production costs	(112,097)		(25,173)		(2,283)
Extensions, discoveries, additions and improved recovery, net of related costs	6,189		0		484,648
Development costs incurred	3,300		1,000		5,200
Revisions of estimated development cost	31,860		52,226		(234)
Revisions of previous quantity estimates	(6,387)		(8,530)		2,809
Accretion of discount	54,880		51,212		2,907
Net change in income taxes	562		137,644		(138,206)
Purchases of reserves in place	0		0		5,623
Sales of reserves in place	0		0		0
Changes in timing and other	10,527		(27,807)		(5,404)
Balance at End of Period	$ 533,085		$ 548,237		$ 373,919

[1] Estimated crude oil prices used to calculate 2014 future cash inflows for the United States, Canada, Trinidad and Other International were $97.51, $95.11, $80.60 and $94.09, respectively. Estimated NGL prices used to calculate 2014 future cash inflows for the United States and Canada were $34.29 and $27.03, respectively. Estimated natural gas prices used to calculate 2014 future cash inflows for the United States, Canada, Trinidad and Other International were $3.71, $4.79, $3.71 and $5.34, respectively.

[2] Estimated crude oil prices used to calculate 2013 future cash inflows for the United States, Canada, Trinidad and Other International were $105.91, $91.47, $94.30 and $107.36, respectively. Estimated NGL prices used to calculate 2013 future cash inflows for the United States and Canada were $29.42 and $40.88, respectively. Estimated natural gas prices used to calculate 2013 future cash inflows for the United States, Canada, Trinidad and Other International were $3.50, $2.95, $3.71 and $5.67, respectively.

[3] Estimated crude oil prices used to calculate 2012 future cash inflows for the United States, Canada, Trinidad and Other International were $99.78, $84.77, $94.46 and $109.94, respectively. Estimated NGL prices used to calculate 2012 future cash inflows for the United States and Canada were $36.95 and $47.80, respectively. Estimated natural gas prices used to calculate 2012 future cash inflows for the United States, Canada, Trinidad and Other International were $2.63, $2.22, $3.61, and $5.04, respectively.

[4] Other International includes EOG's United Kingdom, China and Argentina operations.