Oil and Gas Exploration and Production Industries Disclosures, Discounted Future Net Cash Flows (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows					$ 68,720,648		$ 146,950,221		$ 123,999,499
Future production costs					(32,060,855)		(51,633,293)		(50,166,488)
Future development costs					(15,785,811)		(20,494,765)		(18,549,351)
Future income taxes					(4,616,201)		(23,185,714)		(16,416,387)
Future net cash flows					16,257,781		51,636,449		38,867,273
Discount to present value at 10% annual rate					(6,636,385)		(23,713,031)		(17,533,841)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves		$ 27,923,418	$ 21,333,432	$ 16,915,472	9,621,396		27,923,418		21,333,432
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		$ 27,923,418	$ 21,333,432	$ 16,915,472
Sales and transfers of oil and gas produced, net of production costs		(4,020,717)	(9,470,714)	(8,196,380)
Net changes in prices and production costs		(30,669,350)	1,263,177	1,257,853
Extensions, discoveries, additions and improved recovery, net of related costs		1,095,898	8,083,852	5,483,432
Development costs incurred		2,137,700	2,835,100	2,955,900
Revisions of estimated development cost		4,079,381	1,802,735	990,396
Revisions of previous quantity estimates		(4,051,874)	1,812,532	1,794,198
Accretion of discount		3,857,479	2,833,350	2,133,729
Net change in income taxes		9,728,423	(3,651,300)	(2,578,250)
Purchases of reserves in place		123,542	317,785	66,359
Sales of reserves in place		(37,088)	(478,879)	(140,652)
Changes in timing and other		(545,416)	1,242,348	651,375
Balance at End of Period		9,621,396	27,923,418	21,333,432
United States
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows					67,242,928	[1]	144,355,692	[2]	119,644,713	[3]
Future production costs					(31,707,743)		(51,112,604)		(49,099,393)
Future development costs					(15,579,923)		(20,270,439)		(17,753,860)
Future income taxes					(4,400,542)		(22,725,618)		(15,763,089)
Future net cash flows					15,554,720		50,247,031		37,028,371
Discount to present value at 10% annual rate					(6,589,253)		(23,542,990)		(17,451,470)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves		26,704,041	19,576,901	15,181,334	8,965,467		26,704,041		19,576,901
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		26,704,041	19,576,901	15,181,334
Sales and transfers of oil and gas produced, net of production costs		(3,685,600)	(8,874,180)	(7,561,343)
Net changes in prices and production costs		(29,993,699)	1,481,668	1,734,058
Extensions, discoveries, additions and improved recovery, net of related costs		1,028,410	8,074,550	5,449,531
Development costs incurred		2,135,800	2,818,800	2,792,400
Revisions of estimated development cost		4,087,093	1,696,916	892,803
Revisions of previous quantity estimates		(4,084,572)	1,741,918	1,887,062
Accretion of discount		3,699,330	2,612,286	1,895,503
Net change in income taxes		9,550,847	(3,743,300)	(2,772,267)
Purchases of reserves in place		123,542	317,785	66,359
Sales of reserves in place		(23,424)	(189,808)	(140,652)
Changes in timing and other		(576,301)	1,190,505	152,113
Balance at End of Period		8,965,467	26,704,041	19,576,901
Trinidad
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows					954,779	[1]	1,615,280	[2]	2,082,195	[3]
Future production costs					(183,607)		(277,844)		(315,483)
Future development costs					(140,541)		(84,576)		(112,050)
Future income taxes					(215,659)		(460,096)		(603,786)
Future net cash flows					414,972		792,764		1,050,876
Discount to present value at 10% annual rate					(33,848)		(110,228)		(174,236)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves		682,536	876,640	961,070	381,124		682,536		876,640
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		682,536	876,640	961,070
Sales and transfers of oil and gas produced, net of production costs		(351,606)	(473,757)	(473,544)
Net changes in prices and production costs		(370,503)	(12,079)	(12,050)
Extensions, discoveries, additions and improved recovery, net of related costs		47,613	3,113	0
Development costs incurred		500	12,800	67,100
Revisions of estimated development cost		(34,647)	9,981	(3,539)
Revisions of previous quantity estimates		33,285	35,001	(60,419)
Accretion of discount		104,464	133,019	147,099
Net change in income taxes		177,576	91,438	56,373
Purchases of reserves in place		0	0	0
Sales of reserves in place		0	0	0
Changes in timing and other		91,906	6,380	194,550
Balance at End of Period		381,124	682,536	876,640
Other International (1)
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows	[4]				522,941	[1]	979,249	[2]	2,272,591	[3]
Future production costs	[4]				(169,505)		(242,845)		(751,612)
Future development costs	[4]				(65,347)		(139,750)		(683,441)
Future income taxes	[4]				0		0		(49,512)
Future net cash flows	[4]				288,089		596,654		788,026
Discount to present value at 10% annual rate	[4]				(13,284)		(59,813)		91,865
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves	[4]	536,841	879,891	773,068	$ 274,805		$ 536,841		$ 879,891
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	[4]	536,841	879,891	773,068
Sales and transfers of oil and gas produced, net of production costs	[4]	16,489	(122,777)	(161,493)
Net changes in prices and production costs	[4]	(305,148)	(206,412)	(464,155)
Extensions, discoveries, additions and improved recovery, net of related costs	[4]	19,875	6,189	33,901
Development costs incurred	[4]	1,400	3,500	96,400
Revisions of estimated development cost	[4]	26,935	95,838	101,132
Revisions of previous quantity estimates	[4]	(587)	35,613	(32,445)
Accretion of discount	[4]	53,685	88,045	91,127
Net change in income taxes	[4]	0	562	137,644
Purchases of reserves in place	[4]	0	0	0
Sales of reserves in place	[4]	(13,664)	(289,071)	0
Changes in timing and other	[4]	(61,021)	45,463	304,712
Balance at End of Period	[4]	$ 274,805	$ 536,841	$ 879,891

[1] Estimated crude oil prices used to calculate 2015 future cash inflows for the United States, Trinidad and Other International were $49.58, $38.83 and $47.76, respectively. Estimated NGL price used to calculate 2015 future cash inflows for the United States was $15.17. Estimated natural gas prices used to calculate 2015 future cash inflows for the United States, Trinidad and Other International were $2.15, $2.88 and $5.60, respectively.

[2] Estimated crude oil prices used to calculate 2014 future cash inflows for the United States, Trinidad and Other International were $97.51, $80.60 and $94.09, respectively. Estimated NGL prices used to calculate 2014 future cash inflows for the United States and Other International were $34.29 and $27.03, respectively. Estimated natural gas prices used to calculate 2014 future cash inflows for the United States, Trinidad and Other International were $3.71, $3.71 and $5.14, respectively.

[3] Estimated crude oil prices used to calculate 2013 future cash inflows for the United States, Trinidad and Other International were $105.91, $94.30 and $98.85, respectively. Estimated NGL prices used to calculate 2013 future cash inflows for the United States and Other International were $29.42 and $40.88, respectively. Estimated natural gas prices used to calculate 2013 future cash inflows for the United States, Trinidad and Other International were $3.50, $3.71 and $3.45, respectively

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