Oil and Gas Exploration and Production Industries Disclosures (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2018 USD ($) MBoe MBbls MMcf	Dec. 31, 2017 USD ($) MBoe MBbls MMcf	Dec. 31, 2016 MBoe MBbls MMcf	Dec. 31, 2015 MBoe MBbls MMcf
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves (MBOE) | MBoe		1,548,137	1,364,335	1,093,906	1,072,477
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Balance at January 1 | MBoe		1,162,635	1,053,027	1,045,640
Extensions and Discoveries | MBoe		490,725	237,378	138,101
Revisions | MBoe		(8,244)	33,127	64,413
Acquisition of Reserves | MBoe		311	0	0
Sales of Reserves | MBoe		0	(8,253)	(45,917)
Conversion to Proved Developed Reserves | MBoe		(265,718)	(152,644)	(149,210)
Balance at December 31 | MBoe		1,379,709	1,162,635	1,053,027
Capitalized Costs, Oil and Gas Producing Activities, Gross [Abstract]
Proved properties | $		$ 53,624,809	$ 48,845,672
Unproved properties | $		3,705,207	3,710,069
Total | $		57,330,016	52,555,741
Accumulated depreciation, depletion and amortization | $		(31,674,085)	(29,191,247)
Net capitalized costs | $		$ 25,655,931	$ 23,364,494
Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	1,312,973	1,177,585	1,097,596
Revisions of previous estimates	[1]	(13,376)	57,836	42,955
Purchases in place	[1]	2,743	1,111	25,795
Extensions, discoveries and other additions	[1]	383,018	207,557	123,441
Sales in place	[1]	(7,078)	(8,393)	(8,791)
Production	[1]	(145,968)	(122,723)	(103,411)
Net proved reserves - end of period	[1]	1,532,312	1,312,973	1,177,585
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		712,785	614,236	516,625	445,202
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		819,527	698,737	660,690	652,394
Natural Gas Liquids
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	503,473	416,366	382,875
Revisions of previous estimates	[1]	23,942	46,843	53,771
Purchases in place	[1]	2,006	421	1,284
Extensions, discoveries and other additions	[1]	127,409	75,003	41,862
Sales in place	[1]	(41)	(2,887)	(33,548)
Production	[1]	(42,460)	(32,273)	(29,878)
Net proved reserves - end of period	[1]	614,329	503,473	416,366
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		341,386	286,872	230,219	205,898
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		272,943	216,601	186,147	176,977
Natural Gas (MMcf)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	4,263,100	3,317,900	3,825,900
Revisions of previous estimates | MMcf	[2]	(91,500)	584,000	333,100
Purchases in place | MMcf	[2]	41,300	4,800	91,500
Extensions, discoveries and other additions | MMcf	[2]	956,000	829,400	262,000
Sales in place | MMcf	[2]	(22,200)	(56,400)	(752,000)
Production | MMcf	[2]	(459,500)	(416,600)	(442,600)
Net proved reserves - end of period | MMcf	[2]	4,687,200	4,263,100	3,317,900
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves | MMcf		2,963,800	2,779,300	2,082,400	2,528,300
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves | MMcf		1,723,400	1,483,800	1,235,500	1,297,600
Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	2,526,970	2,146,933	2,118,117
Revisions of previous estimates | MBoe	[1]	(4,684)	202,018	152,242
Purchases in place | MBoe	[1]	11,640	2,332	42,330
Extensions, discoveries and other additions | MBoe	[1]	669,750	420,798	208,963
Sales in place | MBoe	[1]	(10,819)	(20,687)	(167,669)
Production | MBoe	[1]	(265,011)	(224,424)	(207,050)
Net proved reserves - end of period | MBoe	[1]	2,927,846	2,526,970	2,146,933
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe		1,379,709	1,162,635	1,053,027	1,045,640
United States
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves (MBOE) | MBoe		1,503,441	1,300,758	1,038,483	1,018,491
United States | Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	1,304,071	1,168,491	1,087,860
Revisions of previous estimates	[1]	(13,237)	57,935	42,040
Purchases in place	[1]	2,743	1,111	25,795
Extensions, discoveries and other additions	[1]	383,003	207,137	123,441
Sales in place	[1]	(768)	(8,393)	(8,791)
Production	[1]	(144,128)	(122,210)	(101,854)
Net proved reserves - end of period	[1]	1,531,684	1,304,071	1,168,491
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		712,218	605,405	507,531	444,070
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		819,466	698,666	660,690	643,790
United States | Natural Gas Liquids
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	503,473	416,366	382,875
Revisions of previous estimates	[1]	23,942	46,843	53,771
Purchases in place	[1]	2,006	421	1,284
Extensions, discoveries and other additions	[1]	127,409	75,003	41,862
Sales in place	[1]	(41)	(2,887)	(33,548)
Production	[1]	(42,460)	(32,273)	(29,878)
Net proved reserves - end of period	[1]	614,329	503,473	416,366
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		341,386	286,872	230,219	205,898
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		272,943	216,601	186,147	176,977
United States | Natural Gas (MMcf)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	3,898,500	3,021,200	3,489,800
Revisions of previous estimates | MMcf	[2]	(127,200)	602,800	298,400
Purchases in place | MMcf	[2]	41,300	4,800	91,500
Extensions, discoveries and other additions | MMcf	[2]	951,400	619,300	202,100
Sales in place | MMcf	[2]	(22,200)	(56,400)	(752,000)
Production | MMcf	[2]	(351,200)	(293,200)	(308,600)
Net proved reserves - end of period | MMcf	[2]	4,390,600	3,898,500	3,021,200
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves | MMcf		2,699,000	2,450,800	1,804,400	2,211,200
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves | MMcf		1,691,600	1,447,700	1,216,800	1,278,600
United States | Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	2,457,302	2,088,392	2,052,361
Revisions of previous estimates | MBoe	[1]	(10,500)	205,262	145,542
Purchases in place | MBoe	[1]	11,640	2,332	42,330
Extensions, discoveries and other additions | MBoe	[1]	668,972	385,354	198,973
Sales in place | MBoe	[1]	(4,509)	(20,687)	(167,669)
Production | MBoe	[1]	(245,127)	(203,351)	(183,145)
Net proved reserves - end of period | MBoe	[1]	2,877,778	2,457,302	2,088,392
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe		1,374,337	1,156,544	1,049,909	1,033,870
Trinidad
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves (MBOE) | MBoe		37,746	50,779	44,543	50,677
Trinidad | Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	898	839	1,069
Revisions of previous estimates	[1]	(183)	80	54
Purchases in place	[1]	0	0	0
Extensions, discoveries and other additions	[1]	0	301	0
Sales in place	[1]	0	0	0
Production	[1]	(298)	(322)	(284)
Net proved reserves - end of period	[1]	417	898	839
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		417	898	839	1,069
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		0	0	0	0
Trinidad | Natural Gas Liquids
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
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		0	0	0	0
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		0	0	0	0
Trinidad | Natural Gas (MMcf)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	313,400	280,900	316,600
Revisions of previous estimates | MMcf	[2]	20,700	(27,400)	29,500
Purchases in place | MMcf	[2]	0	0	0
Extensions, discoveries and other additions | MMcf	[2]	0	174,200	59,900
Sales in place | MMcf	[2]	0	0	0
Production | MMcf	[2]	(97,100)	(114,300)	(125,100)
Net proved reserves - end of period | MMcf	[2]	237,000	313,400	280,900
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves | MMcf		223,900	299,200	262,200	297,600
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves | MMcf		13,100	14,200	18,700	19,000
Trinidad | Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	53,142	47,661	53,843
Revisions of previous estimates | MBoe	[1]	3,272	(4,493)	4,978
Purchases in place | MBoe	[1]	0	0	0
Extensions, discoveries and other additions | MBoe	[1]	0	29,340	9,990
Sales in place | MBoe	[1]	0	0	0
Production | MBoe	[1]	(16,478)	(19,366)	(21,150)
Net proved reserves - end of period | MBoe	[1]	39,936	53,142	47,661
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe		2,190	2,363	3,118	3,166
Other International
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves (MBOE) | MBoe	[3]	6,950	12,798	10,880	3,309
Other International | Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1],[3]	8,004	8,255	8,667
Revisions of previous estimates	[1],[3]	44	(179)	861
Purchases in place	[1],[3]	0	0	0
Extensions, discoveries and other additions	[1],[3]	15	119	0
Sales in place	[1],[3]	(6,310)	0	0
Production	[1],[3]	(1,542)	(191)	(1,273)
Net proved reserves - end of period	[1],[3]	211	8,004	8,255
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves	[3]	150	7,933	8,255	63
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves	[3]	61	71	0	8,604
Other International | Natural Gas Liquids
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1],[3]	0	0	0
Revisions of previous estimates	[1],[3]	0	0	0
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	0
Production	[1],[3]	0	0	0
Net proved reserves - end of period	[1],[3]	0	0	0
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves	[3]	0	0	0	0
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
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]	51,200	15,800	19,500
Revisions of previous estimates | MMcf	[2],[3]	15,000	8,600	5,200
Purchases in place | MMcf	[2],[3]	0	0	0
Extensions, discoveries and other additions | MMcf	[2],[3]	4,600	35,900	0
Sales in place | MMcf	[2],[3]	0	0	0
Production | MMcf	[2],[3]	(11,200)	(9,100)	(8,900)
Net proved reserves - end of period | MMcf	[2],[3]	59,600	51,200	15,800
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves | MMcf	[3]	40,900	29,300	15,800	19,500
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves | MMcf	[3]	18,700	21,900	0	0
Other International | Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1],[3]	16,526	10,880	11,913
Revisions of previous estimates | MBoe	[1],[3]	2,544	1,249	1,722
Purchases in place | MBoe	[1],[3]	0	0	0
Extensions, discoveries and other additions | MBoe	[1],[3]	778	6,104	0
Sales in place | MBoe	[1],[3]	(6,310)	0	0
Production | MBoe	[1],[3]	(3,406)	(1,707)	(2,755)
Net proved reserves - end of period | MBoe	[1],[3]	10,132	16,526	10,880
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe	[3]	3,182	3,728	0	8,604

[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 United Kingdom operations were sold in the fourth quarter of 2018. The Argentina operations were sold in the third quarter of 2016.