Oil and Gas Exploration and Production Industries Disclosures (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2019 USD ($) MBoe MBbls MMcf	Dec. 31, 2018 USD ($) MBoe MBbls MMcf	Dec. 31, 2017 MBoe MBbls MMcf	Dec. 31, 2016 MBoe MBbls MMcf
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves (MBOE) | MBoe		1,721,212	1,548,137	1,364,335	1,093,906
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Balance at January 1 | MBoe		1,379,709	1,162,635	1,053,027
Extensions and Discoveries | MBoe		578,317	490,725	237,378
Revisions | MBoe		(49,837)	(8,244)	33,127
Acquisition of Reserves | MBoe		1,711	311	0
Sales of Reserves | MBoe		0	0	(8,253)
Conversion to Proved Developed Reserves | MBoe		(302,044)	(265,718)	(152,644)
Balance at December 31 | MBoe		1,607,856	1,379,709	1,162,635
Capitalized Costs, Oil and Gas Producing Activities, Gross [Abstract]
Proved properties | $		$ 59,229,686	$ 53,624,809
Unproved properties | $		3,600,729	3,705,207
Total | $		62,830,415	57,330,016
Accumulated depreciation, depletion and amortization | $		(35,033,085)	(31,674,085)
Net capitalized costs | $		$ 27,797,330	$ 25,655,931
Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	1,532,312	1,312,973	1,177,585
Revisions of previous estimates	[1]	(42,882)	(13,376)	57,836
Purchases in place	[1]	2,859	2,743	1,111
Extensions, discoveries and other additions	[1]	369,996	383,018	207,557
Sales in place	[1]	(1,282)	(7,078)	(8,393)
Production	[1]	(166,586)	(145,968)	(122,723)
Net proved reserves - end of period	[1]	1,694,417	1,532,312	1,312,973
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		801,598	712,785	614,236	516,625
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		892,819	819,527	698,737	660,690
Natural Gas Liquids
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	614,329	503,473	416,366
Revisions of previous estimates	[1]	5,380	23,942	46,843
Purchases in place	[1]	1,948	2,006	421
Extensions, discoveries and other additions	[1]	167,782	127,409	75,003
Sales in place	[1]	(855)	(41)	(2,887)
Production	[1]	(48,892)	(42,460)	(32,273)
Net proved reserves - end of period	[1]	739,692	614,329	503,473
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		387,253	341,386	286,872	230,219
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		352,439	272,943	216,601	186,147
Natural Gas (MMcf)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	4,687,200	4,263,100	3,317,900
Revisions of previous estimates | MMcf	[2]	(134,800)	(91,500)	584,000.0
Purchases in place | MMcf	[2]	71,700	41,300	4,800
Extensions, discoveries and other additions | MMcf	[2]	1,273,100	956,000.0	829,400
Sales in place | MMcf	[2]	(14,500)	(22,200)	(56,400)
Production | MMcf	[2]	(513,000.0)	(459,500)	(416,600)
Net proved reserves - end of period | MMcf	[2]	5,369,700	4,687,200	4,263,100
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves | MMcf		3,194,100	2,963,800	2,779,300	2,082,400
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves | MMcf		2,175,600	1,723,400	1,483,800	1,235,500
Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	2,927,846	2,526,970	2,146,933
Revisions of previous estimates | MBoe	[1]	(59,971)	(4,684)	202,018
Purchases in place | MBoe	[1]	16,761	11,640	2,332
Extensions, discoveries and other additions | MBoe	[1]	749,968	669,750	420,798
Sales in place | MBoe	[1]	(4,555)	(10,819)	(20,687)
Production | MBoe	[1]	(300,981)	(265,011)	(224,424)
Net proved reserves - end of period | MBoe	[1]	3,329,068	2,927,846	2,526,970
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe		1,607,856	1,379,709	1,162,635	1,053,027
United States
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves (MBOE) | MBoe		1,684,209	1,503,441	1,300,758	1,038,483
United States | Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	1,531,684	1,304,071	1,168,491
Revisions of previous estimates	[1]	(42,959)	(13,237)	57,935
Purchases in place	[1]	2,859	2,743	1,111
Extensions, discoveries and other additions	[1]	369,968	383,003	207,137
Sales in place	[1]	(1,282)	(768)	(8,393)
Production	[1]	(166,310)	(144,128)	(122,210)
Net proved reserves - end of period	[1]	1,693,960	1,531,684	1,304,071
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		801,189	712,218	605,405	507,531
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		892,771	819,466	698,666	660,690
United States | Natural Gas Liquids
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	614,329	503,473	416,366
Revisions of previous estimates	[1]	5,380	23,942	46,843
Purchases in place	[1]	1,948	2,006	421
Extensions, discoveries and other additions	[1]	167,782	127,409	75,003
Sales in place	[1]	(855)	(41)	(2,887)
Production	[1]	(48,892)	(42,460)	(32,273)
Net proved reserves - end of period	[1]	739,692	614,329	503,473
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		387,253	341,386	286,872	230,219
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves		352,439	272,943	216,601	186,147
United States | Natural Gas (MMcf)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	4,390,600	3,898,500	3,021,200
Revisions of previous estimates | MMcf	[2]	(184,400)	(127,200)	602,800
Purchases in place | MMcf	[2]	71,700	41,300	4,800
Extensions, discoveries and other additions | MMcf	[2]	1,175,900	951,400	619,300
Sales in place | MMcf	[2]	(14,500)	(22,200)	(56,400)
Production | MMcf	[2]	(404,500)	(351,200)	(293,200)
Net proved reserves - end of period | MMcf	[2]	5,034,800	4,390,600	3,898,500
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves | MMcf		2,974,600	2,699,000.0	2,450,800	1,804,400
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves | MMcf		2,060,200	1,691,600	1,447,700	1,216,800
United States | Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	2,877,778	2,457,302	2,088,392
Revisions of previous estimates | MBoe	[1]	(68,317)	(10,500)	205,262
Purchases in place | MBoe	[1]	16,761	11,640	2,332
Extensions, discoveries and other additions | MBoe	[1]	733,730	668,972	385,354
Sales in place | MBoe	[1]	(4,555)	(4,509)	(20,687)
Production | MBoe	[1]	(282,619)	(245,127)	(203,351)
Net proved reserves - end of period | MBoe	[1]	3,272,778	2,877,778	2,457,302
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe		1,588,569	1,374,337	1,156,544	1,049,909
Trinidad
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves (MBOE) | MBoe		29,886	37,746	50,779	44,543
Trinidad | Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	417	898	839
Revisions of previous estimates	[1]	85	(183)	80
Purchases in place	[1]	0	0	0
Extensions, discoveries and other additions	[1]	0	0	301
Sales in place	[1]	0	0	0
Production	[1]	(236)	(298)	(322)
Net proved reserves - end of period	[1]	266	417	898
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves		266	417	898	839
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]	237,000.0	313,400	280,900
Revisions of previous estimates | MMcf	[2]	47,000.0	20,700	(27,400)
Purchases in place | MMcf	[2]	0	0	0
Extensions, discoveries and other additions | MMcf	[2]	87,500	0	174,200
Sales in place | MMcf	[2]	0	0	0
Production | MMcf	[2]	(95,400)	(97,100)	(114,300)
Net proved reserves - end of period | MMcf	[2]	276,100	237,000.0	313,400
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves | MMcf		177,700	223,900	299,200	262,200
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves | MMcf		98,400	13,100	14,200	18,700
Trinidad | Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	39,936	53,142	47,661
Revisions of previous estimates | MBoe	[1]	7,915	3,272	(4,493)
Purchases in place | MBoe	[1]	0	0	0
Extensions, discoveries and other additions | MBoe	[1]	14,577	0	29,340
Sales in place | MBoe	[1]	0	0	0
Production | MBoe	[1]	(16,130)	(16,478)	(19,366)
Net proved reserves - end of period | MBoe	[1]	46,298	39,936	53,142
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe		16,412	2,190	2,363	3,118
Other International
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves (MBOE) | MBoe	[3]	7,117	6,950	12,798	10,880
Other International | Crude Oil (MBbl)
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1],[3]	211	8,004	8,255
Revisions of previous estimates	[1],[3]	(8)	44	(179)
Purchases in place	[1],[3]	0	0	0
Extensions, discoveries and other additions	[1],[3]	28	15	119
Sales in place	[1],[3]	0	(6,310)	0
Production	[1],[3]	(40)	(1,542)	(191)
Net proved reserves - end of period	[1],[3]	191	211	8,004
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves	[3]	143	150	7,933	8,255
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves	[3]	48	61	71	0
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]	59,600	51,200	15,800
Revisions of previous estimates | MMcf	[2],[3]	2,600	15,000.0	8,600
Purchases in place | MMcf	[2],[3]	0	0	0
Extensions, discoveries and other additions | MMcf	[2],[3]	9,700	4,600	35,900
Sales in place | MMcf	[2],[3]	0	0	0
Production | MMcf	[2],[3]	(13,100)	(11,200)	(9,100)
Net proved reserves - end of period | MMcf	[2],[3]	58,800	59,600	51,200
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved developed reserves | MMcf	[3]	41,800	40,900	29,300	15,800
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserves | MMcf	[3]	17,000.0	18,700	21,900	0
Other International | Oil Equivalents (MBoe)
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1],[3]	10,132	16,526	10,880
Revisions of previous estimates | MBoe	[1],[3]	431	2,544	1,249
Purchases in place | MBoe	[1],[3]	0	0	0
Extensions, discoveries and other additions | MBoe	[1],[3]	1,661	778	6,104
Sales in place | MBoe	[1],[3]	0	(6,310)	0
Production | MBoe	[1],[3]	(2,232)	(3,406)	(1,707)
Net proved reserves - end of period | MBoe	[1],[3]	9,992	10,132	16,526
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Net proved undeveloped reserve (MBOE) | MBoe	[3]	2,875	3,182	3,728	0

[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.