Oil and Gas Exploration and Production Industries Disclosures (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2020 USD ($) MBoe MBbls MMcf	Dec. 31, 2019 USD ($) MBoe MMcf MBbls	Dec. 31, 2018 MBoe MBbls MMcf	Dec. 31, 2017 MBoe MMcf MBbls
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves (MBOE) | MBoe		1,649,098	1,721,212	1,548,137	1,364,335
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Balance at January 1 | MBoe		1,607,856	1,379,709	1,162,635
Extensions and Discoveries | MBoe		456,073	578,317	490,725
Revisions | MBoe		(277,325)	(49,837)	(8,244)
Acquisition of Reserves | MBoe		47	1,711	311
Sales of Reserves | MBoe		(3,670)	0	0
Conversion to Proved Developed Reserves | MBoe		(212,158)	(302,044)	(265,718)
Balance at December 31 | MBoe		1,570,823	1,607,856	1,379,709
Capitalized Costs, Oil and Gas Producing Activities, Gross [Abstract]
Proved properties | $		$ 61,724,487	$ 59,229,686
Unproved properties | $		3,068,311	3,600,729
Total | $		64,792,798	62,830,415
Accumulated depreciation, depletion and amortization | $		(38,750,852)	(35,033,085)
Net capitalized costs | $		$ 26,041,946	$ 27,797,330
Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	1,694,417	1,532,312	1,312,973
Revisions of previous estimates	[1]	(225,412)	(42,882)	(13,376)
Purchases in place	[1]	2,176	2,859	2,743
Extensions, discoveries and other additions	[1]	195,587	369,996	383,018
Sales in place	[1]	(3,183)	(1,282)	(7,078)
Production	[1]	(149,787)	(166,586)	(145,968)
Net proved reserves - end of period	[1]	1,513,798	1,694,417	1,532,312
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		792,592	801,598	712,785	614,236
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		721,206	892,819	819,527	698,737
Natural Gas Liquids
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	739,692	614,329	503,473
Revisions of previous estimates	[1]	(59,790)	5,380	23,942
Purchases in place	[1]	3,831	1,948	2,006
Extensions, discoveries and other additions	[1]	180,205	167,782	127,409
Sales in place	[1]	(1,399)	(855)	(41)
Production	[1]	(49,796)	(48,892)	(42,460)
Net proved reserves - end of period	[1]	812,743	739,692	614,329
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		391,708	387,253	341,386	286,872
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		421,035	352,439	272,943	216,601
Natural Gas (MMcf)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	5,369,700	4,687,200	4,263,100
Revisions of previous estimates | MMcf	[2]	(491,300)	(134,800)	(91,500)
Purchases in place | MMcf	[2]	26,300	71,700	41,300
Extensions, discoveries and other additions | MMcf	[2]	1,131,800	1,273,100	956,000.0
Sales in place | MMcf	[2]	(157,300)	(14,500)	(22,200)
Production | MMcf	[2]	(518,900)	(513,000.0)	(459,500)
Net proved reserves - end of period | MMcf	[2]	5,360,300	5,369,700	4,687,200
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves | MMcf		2,788,800	3,194,100	2,963,800	2,779,300
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves | MMcf		2,571,500	2,175,600	1,723,400	1,483,800
Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	3,329,068	2,927,846	2,526,970
Revisions of previous estimates | MBoe	[1]	(367,095)	(59,971)	(4,684)
Purchases in place | MBoe	[1]	10,398	16,761	11,640
Extensions, discoveries and other additions | MBoe	[1]	564,425	749,968	669,750
Sales in place | MBoe	[1]	(30,802)	(4,555)	(10,819)
Production | MBoe	[1]	(286,073)	(300,981)	(265,011)
Net proved reserves - end of period | MBoe	[1]	3,219,921	3,329,068	2,927,846
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe		1,570,823	1,607,856	1,379,709	1,162,635
United States
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves (MBOE) | MBoe		1,614,462	1,684,209	1,503,441	1,300,758
United States | Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	1,693,960	1,531,684	1,304,071
Revisions of previous estimates	[1]	(225,375)	(42,959)	(13,237)
Purchases in place	[1]	2,176	2,859	2,743
Extensions, discoveries and other additions	[1]	194,724	369,968	383,003
Sales in place	[1]	(3,183)	(1,282)	(768)
Production	[1]	(149,402)	(166,310)	(144,128)
Net proved reserves - end of period	[1]	1,512,900	1,693,960	1,531,684
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		791,744	801,189	712,218	605,405
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		721,156	892,771	819,466	698,666
United States | Natural Gas Liquids
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	739,692	614,329	503,473
Revisions of previous estimates	[1]	(59,790)	5,380	23,942
Purchases in place	[1]	3,831	1,948	2,006
Extensions, discoveries and other additions	[1]	180,205	167,782	127,409
Sales in place	[1]	(1,399)	(855)	(41)
Production	[1]	(49,796)	(48,892)	(42,460)
Net proved reserves - end of period	[1]	812,743	739,692	614,329
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		391,708	387,253	341,386	286,872
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		421,035	352,439	272,943	216,601
United States | Natural Gas (MMcf)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	5,034,800	4,390,600	3,898,500
Revisions of previous estimates | MMcf	[2]	(497,700)	(184,400)	(127,200)
Purchases in place | MMcf	[2]	26,300	71,700	41,300
Extensions, discoveries and other additions | MMcf	[2]	1,077,900	1,175,900	951,400
Sales in place | MMcf	[2]	(157,300)	(14,500)	(22,200)
Production | MMcf	[2]	(441,400)	(404,500)	(351,200)
Net proved reserves - end of period | MMcf	[2]	5,042,600	5,034,800	4,390,600
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves | MMcf		2,586,100	2,974,600	2,699,000.0	2,450,800
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves | MMcf		2,456,500	2,060,200	1,691,600	1,447,700
United States | Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	3,272,778	2,877,778	2,457,302
Revisions of previous estimates | MBoe	[1]	(368,127)	(68,317)	(10,500)
Purchases in place | MBoe	[1]	10,398	16,761	11,640
Extensions, discoveries and other additions | MBoe	[1]	554,585	733,730	668,972
Sales in place | MBoe	[1]	(30,802)	(4,555)	(4,509)
Production | MBoe	[1]	(272,757)	(282,619)	(245,127)
Net proved reserves - end of period | MBoe	[1]	3,166,075	3,272,778	2,877,778
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe		1,551,613	1,588,569	1,374,337	1,156,544
Trinidad
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves (MBOE) | MBoe		29,268	29,886	37,746	50,779
Trinidad | Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	266	417	898
Revisions of previous estimates	[1]	(19)	85	(183)
Purchases in place	[1]	0	0	0
Extensions, discoveries and other additions	[1]	863	0	0
Sales in place	[1]	0	0	0
Production	[1]	(355)	(236)	(298)
Net proved reserves - end of period	[1]	755	266	417
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		755	266	417	898
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]	276,100	237,000.0	313,400
Revisions of previous estimates | MMcf	[2]	4,800	47,000.0	20,700
Purchases in place | MMcf	[2]	0	0	0
Extensions, discoveries and other additions | MMcf	[2]	53,900	87,500	0
Sales in place | MMcf	[2]	0	0	0
Production | MMcf	[2]	(65,900)	(95,400)	(97,100)
Net proved reserves - end of period | MMcf	[2]	268,900	276,100	237,000.0
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves | MMcf		171,100	177,700	223,900	299,200
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves | MMcf		97,800	98,400	13,100	14,200
Trinidad | Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	46,298	39,936	53,142
Revisions of previous estimates | MBoe	[1]	773	7,915	3,272
Purchases in place | MBoe	[1]	0	0	0
Extensions, discoveries and other additions | MBoe	[1]	9,840	14,577	0
Sales in place | MBoe	[1]	0	0	0
Production | MBoe	[1]	(11,347)	(16,130)	(16,478)
Net proved reserves - end of period | MBoe	[1]	45,564	46,298	39,936
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe		16,296	16,412	2,190	2,363
Other International
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves (MBOE) | MBoe	[3]	5,368	7,117	6,950	12,798
Other International | Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1],[3]	191	211	8,004
Revisions of previous estimates	[1],[3]	(18)	(8)	44
Purchases in place	[1],[3]	0	0	0
Extensions, discoveries and other additions	[1],[3]	0	28	15
Sales in place	[1],[3]	0	0	(6,310)
Production	[1],[3]	(30)	(40)	(1,542)
Net proved reserves - end of period	[1],[3]	143	191	211
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves	[3]	93	143	150	7,933
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves	[3]	50	48	61	71
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]	58,800	59,600	51,200
Revisions of previous estimates | MMcf	[2],[3]	1,600	2,600	15,000.0
Purchases in place | MMcf	[2],[3]	0	0	0
Extensions, discoveries and other additions | MMcf	[2],[3]	0	9,700	4,600
Sales in place | MMcf	[2],[3]	0	0	0
Production | MMcf	[2],[3]	(11,600)	(13,100)	(11,200)
Net proved reserves - end of period | MMcf	[2],[3]	48,800	58,800	59,600
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves | MMcf	[3]	31,600	41,800	40,900	29,300
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves | MMcf	[3]	17,200	17,000.0	18,700	21,900
Other International | Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1],[3]	9,992	10,132	16,526
Revisions of previous estimates | MBoe	[1],[3]	259	431	2,544
Purchases in place | MBoe	[1],[3]	0	0	0
Extensions, discoveries and other additions | MBoe	[1],[3]	0	1,661	778
Sales in place | MBoe	[1],[3]	0	0	(6,310)
Production | MBoe	[1],[3]	(1,969)	(2,232)	(3,406)
Net proved reserves - end of period | MBoe	[1],[3]	8,282	9,992	10,132
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe	[3]	2,914	2,875	3,182	3,728

[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 and Canada operations. The United Kingdom operations were sold in the fourth quarter of 2018.