Oil and Gas Exploration and Production Industries Disclosures (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2017 USD ($) MBoe MMcf MBbls	Dec. 31, 2016 USD ($) MBoe MMcf MBbls	Dec. 31, 2015 MBoe MMcf MBbls	Dec. 31, 2014 MBoe MMcf MBbls
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Balance at January 1 | MBoe		1,053,027	1,045,640	1,149,309
Extensions and Discoveries | MBoe		237,378	138,101	205,152
Revisions | MBoe		33,127	64,413	(241,973)
Acquisition of Reserves | MBoe		0	0	54,458
Sales of Reserves | MBoe		(8,253)	(45,917)	0
Conversion to Proved Developed Reserves | MBoe		(152,644)	(149,210)	(121,306)
Balance at December 31 | MBoe		1,162,635	1,053,027	1,045,640
Net proved developed reserves (MBOE) | MBoe		1,364,335	1,093,906	1,072,477	1,347,947
Capitalized Costs, Oil and Gas Producing Activities, Gross [Abstract]
Proved properties | $		$ 48,845,672	$ 45,751,965
Unproved properties | $		3,710,069	3,840,126
Total | $		52,555,741	49,592,091
Accumulated depreciation, depletion and amortization | $		(29,191,247)	(26,247,062)
Net capitalized costs | $		$ 23,364,494	$ 23,345,029
Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	1,177,585	1,097,596	1,139,750
Revisions of previous estimates	[1]	57,836	42,955	(114,925)
Purchases in place	[1]	1,111	25,795	35,922
Extensions, discoveries and other additions	[1]	207,557	123,441	141,386
Sales in place	[1]	(8,393)	(8,791)	(740)
Production	[1]	(122,723)	(103,411)	(103,797)
Net proved reserves - end of period	[1]	1,312,973	1,177,585	1,097,596
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves		614,236	516,625	445,202	495,148
Net proved undeveloped reserves		698,737	660,690	652,394	644,602
Natural Gas Liquids (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	416,366	382,875	467,068
Revisions of previous estimates	[1]	46,843	53,771	(113,222)
Purchases in place	[1]	421	1,284	8,251
Extensions, discoveries and other additions	[1]	75,003	41,862	49,147
Sales in place	[1]	(2,887)	(33,548)	(271)
Production	[1]	(32,273)	(29,878)	(28,098)
Net proved reserves - end of period	[1]	503,473	416,366	382,875
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves		286,872	230,219	205,898	264,749
Net proved undeveloped reserves		216,601	186,147	176,977	202,319
Natural Gas (MMcf)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	3,317,900	3,825,900	5,342,600
Revisions of previous estimates | MMcf	[2]	584,000	333,100	(1,430,700)
Purchases in place | MMcf	[2]	4,800	91,500	72,300
Extensions, discoveries and other additions | MMcf	[2]	829,400	262,000	332,400
Sales in place | MMcf	[2]	(56,400)	(752,000)	(15,000)
Production | MMcf	[2]	(416,600)	(442,600)	(475,700)
Net proved reserves - end of period | MMcf	[2]	4,263,100	3,317,900	3,825,900
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves | MMcf		2,779,300	2,082,400	2,528,300	3,528,300
Net proved undeveloped reserves | MMcf		1,483,800	1,235,500	1,297,600	1,814,300
Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	2,146,933	2,118,117	2,497,256
Revisions of previous estimates | MBoe	[1]	202,018	152,242	(466,604)
Purchases in place | MBoe	[1]	2,332	42,330	56,215
Extensions, discoveries and other additions | MBoe	[1]	420,798	208,963	245,931
Sales in place | MBoe	[1]	(20,687)	(167,669)	(3,506)
Production | MBoe	[1]	(224,424)	(207,050)	(211,175)
Net proved reserves - end of period | MBoe	[1]	2,526,970	2,146,933	2,118,117
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe		1,162,635	1,053,027	1,045,640	1,149,309
United States
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves (MBOE) | MBoe		1,300,758	1,038,483	1,018,491	1,275,447
United States | Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	1,168,491	1,087,860	1,129,682
Revisions of previous estimates	[1]	57,935	42,040	(114,924)
Purchases in place	[1]	1,111	25,795	35,922
Extensions, discoveries and other additions	[1]	207,137	123,441	141,310
Sales in place	[1]	(8,393)	(8,791)	(730)
Production	[1]	(122,210)	(101,854)	(103,400)
Net proved reserves - end of period	[1]	1,304,071	1,168,491	1,087,860
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves		605,405	507,531	444,070	493,694
Net proved undeveloped reserves		698,666	660,690	643,790	635,988
United States | Natural Gas Liquids (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	416,366	382,875	466,930
Revisions of previous estimates	[1]	46,843	53,771	(113,290)
Purchases in place	[1]	421	1,284	8,251
Extensions, discoveries and other additions	[1]	75,003	41,862	49,147
Sales in place	[1]	(2,887)	(33,548)	(84)
Production	[1]	(32,273)	(29,878)	(28,079)
Net proved reserves - end of period	[1]	503,473	416,366	382,875
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves		286,872	230,219	205,898	264,611
Net proved undeveloped reserves		216,601	186,147	176,977	202,319
United States | Natural Gas (MMcf)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	3,021,200	3,489,800	4,905,500
Revisions of previous estimates | MMcf	[2]	602,800	298,400	(1,453,100)
Purchases in place | MMcf	[2]	4,800	91,500	72,300
Extensions, discoveries and other additions | MMcf	[2]	619,300	202,100	306,300
Sales in place | MMcf	[2]	(56,400)	(752,000)	(3,900)
Production | MMcf	[2]	(293,200)	(308,600)	(337,300)
Net proved reserves - end of period | MMcf	[2]	3,898,500	3,021,200	3,489,800
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves | MMcf		2,450,800	1,804,400	2,211,200	3,102,800
Net proved undeveloped reserves | MMcf		1,447,700	1,216,800	1,278,600	1,802,700
United States | Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	2,088,392	2,052,361	2,414,202
Revisions of previous estimates | MBoe	[1]	205,262	145,542	(470,401)
Purchases in place | MBoe	[1]	2,332	42,330	56,215
Extensions, discoveries and other additions | MBoe	[1]	385,354	198,973	241,513
Sales in place | MBoe	[1]	(20,687)	(167,669)	(1,467)
Production | MBoe	[1]	(203,351)	(183,145)	(187,701)
Net proved reserves - end of period | MBoe	[1]	2,457,302	2,088,392	2,052,361
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe		1,156,544	1,049,909	1,033,870	1,138,755
Trinidad
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves (MBOE) | MBoe		50,779	44,543	50,677	67,484
Trinidad | Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	839	1,069	1,339
Revisions of previous estimates	[1]	80	54	(1)
Purchases in place	[1]	0	0	0
Extensions, discoveries and other additions	[1]	301	0	63
Sales in place	[1]	0	0	0
Production	[1]	(322)	(284)	(332)
Net proved reserves - end of period	[1]	898	839	1,069
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves		898	839	1,069	1,339
Net proved undeveloped reserves		0	0	0	0
Trinidad | Natural Gas Liquids (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	0	0	0
Revisions of previous estimates	[1]	0	0	0
Purchases in place	[1]	0	0	0
Extensions, discoveries and other additions	[1]	0	0	0
Sales in place	[1]	0	0	0
Production	[1]	0	0	0
Net proved reserves - end of period	[1]	0	0	0
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves		0	0	0	0
Net proved undeveloped reserves		0	0	0	0
Trinidad | Natural Gas (MMcf)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	280,900	316,600	405,600
Revisions of previous estimates | MMcf	[2]	(27,400)	29,500	16,800
Purchases in place | MMcf	[2]	0	0	0
Extensions, discoveries and other additions | MMcf	[2]	174,200	59,900	21,700
Sales in place | MMcf	[2]	0	0	0
Production | MMcf	[2]	(114,300)	(125,100)	(127,500)
Net proved reserves - end of period | MMcf	[2]	313,400	280,900	316,600
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves | MMcf		299,200	262,200	297,600	396,900
Net proved undeveloped reserves | MMcf		14,200	18,700	19,000	8,700
Trinidad | Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	47,661	53,843	68,937
Revisions of previous estimates | MBoe	[1]	(4,493)	4,978	2,802
Purchases in place | MBoe	[1]	0	0	0
Extensions, discoveries and other additions | MBoe	[1]	29,340	9,990	3,682
Sales in place | MBoe	[1]	0	0	0
Production | MBoe	[1]	(19,366)	(21,150)	(21,578)
Net proved reserves - end of period | MBoe	[1]	53,142	47,661	53,843
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe		2,363	3,118	3,166	1,453
Other International
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves (MBOE) | MBoe	[3]	12,798	10,880	3,309	5,016
Other International | Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1],[3]	8,255	8,667	8,729
Revisions of previous estimates	[1],[3]	(179)	861	0
Purchases in place	[1],[3]	0	0	0
Extensions, discoveries and other additions	[1],[3]	119	0	13
Sales in place	[1],[3]	0	0	(10)
Production	[1],[3]	(191)	(1,273)	(65)
Net proved reserves - end of period	[1],[3]	8,004	8,255	8,667
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves	[3]	7,933	8,255	63	115
Net proved undeveloped reserves	[3]	71	0	8,604	8,614
Other International | Natural Gas Liquids (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1],[3]	0	0	138
Revisions of previous estimates	[1],[3]	0	0	68
Purchases in place	[1],[3]	0	0	0
Extensions, discoveries and other additions	[1],[3]	0	0	0
Sales in place	[1],[3]	0	0	(187)
Production	[1],[3]	0	0	(19)
Net proved reserves - end of period	[1],[3]	0	0	0
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves	[3]	0	0	0	138
Net proved undeveloped reserves	[3]	0	0	0	0
Other International | Natural Gas (MMcf)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2],[3]	15,800	19,500	31,500
Revisions of previous estimates | MMcf	[2],[3]	8,600	5,200	5,600
Purchases in place | MMcf	[2],[3]	0	0	0
Extensions, discoveries and other additions | MMcf	[2],[3]	35,900	0	4,400
Sales in place | MMcf	[2],[3]	0	0	(11,100)
Production | MMcf	[2],[3]	(9,100)	(8,900)	(10,900)
Net proved reserves - end of period | MMcf	[2],[3]	51,200	15,800	19,500
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved developed reserves | MMcf	[3]	29,300	15,800	19,500	28,600
Net proved undeveloped reserves | MMcf	[3]	21,900	0	0	2,900
Other International | Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1],[3]	10,880	11,913	14,117
Revisions of previous estimates | MBoe	[1],[3]	1,249	1,722	995
Purchases in place | MBoe	[1],[3]	0	0	0
Extensions, discoveries and other additions | MBoe	[1],[3]	6,104	0	736
Sales in place | MBoe	[1],[3]	0	0	(2,039)
Production | MBoe	[1],[3]	(1,707)	(2,755)	(1,896)
Net proved reserves - end of period | MBoe	[1],[3]	16,526	10,880	11,913
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe	[3]	3,728	0	8,604	9,101

[1] Thousand barrels or thousand barrels of oil equivalent, as applicable; oil equivalents include crude oil and condensate, NGLs and natural gas. Oil equivalents are determined using a ratio of 1.0 barrel of crude oil and condensate or NGLs to 6.0 thousand cubic feet of natural gas.

[2] Billion cubic feet.

[3] Other International includes EOG's United Kingdom, China, Canada and Argentina operations. The Argentina operations were sold in the third quarter of 2016.