Oil and Gas Exploration and Production Industries Disclosures (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2015 USD ($) MBoe MBbls MMcf	Dec. 31, 2014 USD ($) MBoe MBbls MMcf	Dec. 31, 2013 MBoe MBbls MMcf	Dec. 31, 2012 MBoe MBbls MMcf
Reserve Quantities [Line Items]
Net proved developed reserves (MBOE) | MBoe		1,072,477	1,347,947	1,127,476	949,819
Net Proved Undeveloped Reserves (MBOE) [Rollforward]
Balance at January 1 | MBoe		1,149,309	991,067	860,879
Extensions and Discoveries | MBoe		205,152	403,713	291,345
Revisions | MBoe		(241,973)	(79,630)	(855)
Acquisition of Reserves | MBoe		54,458	4,239	0
Sales of Reserves | MBoe		0	(10,176)	0
Conversion to Proved Developed Reserves | MBoe		(121,306)	(159,904)	(160,302)
Balance at December 31 | MBoe		1,045,640	1,149,309	991,067
Capitalized Costs, Oil and Gas Producing Activities, Gross [Abstract]
Proved properties | $		$ 49,623,518	$ 45,169,101
Unproved properties | $		989,723	1,334,431
Total | $		50,613,241	46,503,532
Accumulated depreciation, depletion and amortization | $		(28,877,593)	(20,212,748)
Net capitalized costs | $		$ 21,735,648	$ 26,290,784
Crude Oil (MBbl)
Reserve Quantities [Line Items]
Net proved developed reserves		445,202	495,148	391,056	290,650
Net proved undeveloped reserves		652,394	644,602	509,484	410,168
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	1,139,750	900,540	700,818
Revisions of previous estimates	[1]	(114,925)	28,022	50,669
Purchases in place	[1]	35,922	9,705	1,097
Extensions, discoveries and other additions	[1]	141,386	319,554	230,754
Sales in place	[1]	(740)	(12,623)	(2,337)
Production	[1]	(103,797)	(105,448)	(80,461)
Net proved reserves - end of period	[1]	1,097,596	1,139,750	900,540
Natural Gas Liquids (MBbl)
Reserve Quantities [Line Items]
Net proved developed reserves		205,898	264,749	200,860	162,593
Net proved undeveloped reserves		176,977	202,319	176,346	157,370
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	467,068	377,206	319,963
Revisions of previous estimates	[1]	(113,222)	27,443	12,109
Purchases in place	[1]	8,251	1,812	1,202
Extensions, discoveries and other additions	[1]	49,147	91,683	69,197
Sales in place	[1]	(271)	(1,779)	(1,471)
Production	[1]	(28,098)	(29,297)	(23,794)
Net proved reserves - end of period	[1]	382,875	467,068	377,206
Natural Gas (MMcf)
Reserve Quantities [Line Items]
Net proved developed reserves | MMcf		2,528,300	3,528,300	3,213,400	2,979,500
Net proved undeveloped reserves | MMcf		1,297,600	1,814,300	1,831,400	1,760,000
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	5,342,600	5,044,800	4,739,500
Revisions of previous estimates | MMcf	[2]	(1,430,700)	270,600	277,300
Purchases in place | MMcf	[2]	72,300	17,100	5,700
Extensions, discoveries and other additions | MMcf	[2]	332,400	647,500	594,100
Sales in place | MMcf	[2]	(15,000)	(131,100)	(69,400)
Production | MMcf	[2]	(475,700)	(506,300)	(502,400)
Net proved reserves - end of period | MMcf	[2]	3,825,900	5,342,600	5,044,800
Oil Equivalents (MBoe)
Reserve Quantities [Line Items]
Net proved undeveloped reserve (MBOE) | MBoe		1,045,640	1,149,309	991,067	860,879
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	2,497,256	2,118,543	1,810,698
Revisions of previous estimates | MBoe	[1]	(466,604)	100,568	108,990
Purchases in place | MBoe	[1]	56,215	14,367	3,241
Extensions, discoveries and other additions | MBoe	[1]	245,931	519,167	398,965
Sales in place | MBoe	[1]	(3,506)	(36,263)	(15,375)
Production | MBoe	[1]	(211,175)	(219,126)	(187,976)
Net proved reserves - end of period | MBoe	[1]	2,118,117	2,497,256	2,118,543
United States
Reserve Quantities [Line Items]
Net proved developed reserves (MBOE) | MBoe		1,018,491	1,275,447	1,015,359	840,564
United States | Crude Oil (MBbl)
Reserve Quantities [Line Items]
Net proved developed reserves		444,070	493,694	382,517	281,167
Net proved undeveloped reserves		643,790	635,988	497,532	389,862
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	1,129,682	880,049	671,029
Revisions of previous estimates	[1]	(114,924)	28,301	57,668
Purchases in place	[1]	35,922	9,705	1,097
Extensions, discoveries and other additions	[1]	141,310	319,540	230,023
Sales in place	[1]	(730)	(4,967)	(2,337)
Production	[1]	(103,400)	(102,946)	(77,431)
Net proved reserves - end of period	[1]	1,087,860	1,129,682	880,049
United States | Natural Gas Liquids (MBbl)
Reserve Quantities [Line Items]
Net proved developed reserves		205,898	264,611	199,964	161,482
Net proved undeveloped reserves		176,977	202,319	176,038	156,924
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	466,930	376,002	318,406
Revisions of previous estimates	[1]	(113,290)	27,450	12,157
Purchases in place	[1]	8,251	1,812	1,202
Extensions, discoveries and other additions	[1]	49,147	91,683	69,187
Sales in place	[1]	(84)	(956)	(1,471)
Production	[1]	(28,079)	(29,061)	(23,479)
Net proved reserves - end of period	[1]	382,875	466,930	376,002
United States | Natural Gas (MMcf)
Reserve Quantities [Line Items]
Net proved developed reserves | MMcf		2,211,200	3,102,800	2,597,300	2,387,500
Net proved undeveloped reserves | MMcf		1,278,600	1,802,700	1,801,400	1,648,500
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	4,905,500	4,398,700	4,036,000
Revisions of previous estimates | MMcf	[2]	(1,453,100)	252,200	264,000
Purchases in place | MMcf	[2]	72,300	17,100	5,700
Extensions, discoveries and other additions | MMcf	[2]	306,300	638,300	504,700
Sales in place | MMcf	[2]	(3,900)	(52,400)	(69,400)
Production | MMcf	[2]	(337,300)	(348,400)	(342,300)
Net proved reserves - end of period | MMcf	[2]	3,489,800	4,905,500	4,398,700
United States | Oil Equivalents (MBoe)
Reserve Quantities [Line Items]
Net proved undeveloped reserve (MBOE) | MBoe		1,033,870	1,138,755	973,807	821,544
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	2,414,202	1,989,166	1,662,108
Revisions of previous estimates | MBoe	[1]	(470,401)	97,782	113,823
Purchases in place | MBoe	[1]	56,215	14,367	3,241
Extensions, discoveries and other additions | MBoe	[1]	241,513	517,613	383,324
Sales in place | MBoe	[1]	(1,467)	(14,661)	(15,375)
Production | MBoe	[1]	(187,701)	(190,065)	(157,955)
Net proved reserves - end of period | MBoe	[1]	2,052,361	2,414,202	1,989,166
Trinidad
Reserve Quantities [Line Items]
Net proved developed reserves (MBOE) | MBoe		50,677	67,484	83,933	81,826
Trinidad | Crude Oil (MBbl)
Reserve Quantities [Line Items]
Net proved developed reserves		1,069	1,339	1,505	2,377
Net proved undeveloped reserves		0	0	85	651
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1]	1,339	1,590	3,028
Revisions of previous estimates	[1]	(1)	99	(991)
Purchases in place	[1]	0	0	0
Extensions, discoveries and other additions	[1]	63	0	0
Sales in place	[1]	0	0	0
Production	[1]	(332)	(350)	(447)
Net proved reserves - end of period	[1]	1,069	1,339	1,590
Trinidad | Natural Gas Liquids (MBbl)
Reserve Quantities [Line Items]
Net proved developed reserves		0	0	0	0
Net proved undeveloped reserves		0	0	0	0
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
Trinidad | Natural Gas (MMcf)
Reserve Quantities [Line Items]
Net proved developed reserves | MMcf		297,600	396,900	494,600	476,700
Net proved undeveloped reserves | MMcf		19,000	8,700	26,100	111,500
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2]	405,600	520,700	588,200
Revisions of previous estimates | MMcf	[2]	16,800	12,900	(17,400)
Purchases in place | MMcf	[2]	0	0	0
Extensions, discoveries and other additions | MMcf	[2]	21,700	4,500	79,500
Sales in place | MMcf	[2]	0	0	0
Production | MMcf	[2]	(127,500)	(132,500)	(129,600)
Net proved reserves - end of period | MMcf	[2]	316,600	405,600	520,700
Trinidad | Oil Equivalents (MBoe)
Reserve Quantities [Line Items]
Net proved undeveloped reserve (MBOE) | MBoe		3,166	1,453	4,431	19,234
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1]	68,937	88,364	101,060
Revisions of previous estimates | MBoe	[1]	2,802	2,245	(3,892)
Purchases in place | MBoe	[1]	0	0	0
Extensions, discoveries and other additions | MBoe	[1]	3,682	758	13,245
Sales in place | MBoe	[1]	0	0	0
Production | MBoe	[1]	(21,578)	(22,430)	(22,049)
Net proved reserves - end of period | MBoe	[1]	53,843	68,937	88,364
Other International
Reserve Quantities [Line Items]
Net proved developed reserves (MBOE) | MBoe	[3]	3,309	5,016	28,184	27,429
Other International | Crude Oil (MBbl)
Reserve Quantities [Line Items]
Net proved developed reserves	[3]	63	115	7,034	7,106
Net proved undeveloped reserves	[3]	8,604	8,614	11,867	19,655
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1],[3]	8,729	18,901	26,761
Revisions of previous estimates	[1],[3]	0	(378)	(6,008)
Purchases in place	[1],[3]	0	0	0
Extensions, discoveries and other additions	[1],[3]	13	14	731
Sales in place	[1],[3]	(10)	(7,656)	0
Production	[1],[3]	(65)	(2,152)	(2,583)
Net proved reserves - end of period	[1],[3]	8,667	8,729	18,901
Other International | Natural Gas Liquids (MBbl)
Reserve Quantities [Line Items]
Net proved developed reserves	[3]	0	138	896	1,111
Net proved undeveloped reserves	[3]	0	0	308	446
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period	[1],[3]	138	1,204	1,557
Revisions of previous estimates	[1],[3]	68	(7)	(48)
Purchases in place	[1],[3]	0	0	0
Extensions, discoveries and other additions	[1],[3]	0	0	10
Sales in place	[1],[3]	(187)	(823)	0
Production	[1],[3]	(19)	(236)	(315)
Net proved reserves - end of period	[1],[3]	0	138	1,204
Other International | Natural Gas (MMcf)
Reserve Quantities [Line Items]
Net proved developed reserves | MMcf	[3]	19,500	28,600	121,500	115,300
Net proved undeveloped reserves | MMcf	[3]	0	2,900	3,900	0
Proved Developed Reserves [Rollforward]
Net proved reserves - beginning of period | MMcf	[2],[3]	31,500	125,400	115,300
Revisions of previous estimates | MMcf	[2],[3]	5,600	5,500	30,700
Purchases in place | MMcf	[2],[3]	0	0	0
Extensions, discoveries and other additions | MMcf	[2],[3]	4,400	4,700	9,900
Sales in place | MMcf	[2],[3]	(11,100)	(78,700)	0
Production | MMcf	[2],[3]	(10,900)	(25,400)	(30,500)
Net proved reserves - end of period | MMcf	[2],[3]	19,500	31,500	125,400
Other International | Oil Equivalents (MBoe)
Reserve Quantities [Line Items]
Net proved undeveloped reserve (MBOE) | MBoe	[3]	8,604	9,101	12,829	20,101
Proved Developed Reserves (MBoe) [Roll Forward]
Net proved reserves - beginning of period | MBoe	[1],[3]	14,117	41,013	47,530
Revisions of previous estimates | MBoe	[1],[3]	995	541	(941)
Purchases in place | MBoe	[1],[3]	0	0	0
Extensions, discoveries and other additions | MBoe	[1],[3]	736	796	2,396
Sales in place | MBoe	[1],[3]	(2,039)	(21,602)	0
Production | MBoe	[1],[3]	(1,896)	(6,631)	(7,972)
Net proved reserves - end of period | MBoe	[1],[3]	11,913	14,117	41,013

[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.