Oil and Gas Exploration and Production Industries Disclosures (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 Boe		Dec. 31, 2012 Boe		Dec. 31, 2011 Boe		Dec. 31, 2010 Boe
Proved Developed And Undeveloped Reserves (Boe) [Rollforward]
Net proved reserves - beginning of period (Boe)	1,810,698,000	[1]	2,053,763,000	[1]	1,949,535,000	[1]
Revisions of previous estimates	108,990,000	[1]	(392,621,000)	[1]	(59,163,000)	[1]
Purchases in place	3,241,000	[1]	4,098,000	[1]	521,000	[1]
Extensions, discoveries and other additions	398,965,000	[1]	406,932,000	[1]	387,255,000	[1]
Sales in place	(15,375,000)	[1]	(90,420,000)	[1]	(68,247,000)	[1]
Production	(187,976,000)	[1]	(171,054,000)	[1]	(156,138,000)	[1]
Net proved reserves - end of period (Boe)	2,118,543,000	[1]	1,810,698,000	[1]	2,053,763,000	[1]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves (BOE)	1,127,476,000		949,819,000		1,042,713,000		1,012,987,000
Net proved undeveloped reserve (BOE)	991,067,000		860,879,000		1,011,050,000		936,548,000
Revisions of previous estimates	108,990,000	[1]	(392,621,000)	[1]	(59,163,000)	[1]
Revision of Proved Reserves Due to Decrease or Increase in the Average Natural Gas Price for the Year as Compared to Prior Year (stated in Boe)	61,000,000		(531,000,000)		(16,000,000)
Revisions of Proved Undeveloped Reserves (stated in Boe)	(1,000,000)		(293,000,000)		(7,000,000)
Sales in Place of Proved Undeveloped Reserves (stated in Boe)			19,000,000		9,000,000
Proved Undeveloped Reserves Drilled and Transferred to Proved Developed Reserves (stated in Boe)	160,000,000		138,000,000		144,000,000
Capitalized Costs Related to Proved Undeveloped Reserves Drilled and Transferred to Proved Developed Reserves	$ 2,874,000,000		$ 2,764,000,000		$ 1,619,000,000
Capitalized Costs, Oil and Gas Producing Activities, Gross [Abstract]
Proved properties	41,377,303,000		36,872,434,000
Unproved properties	1,444,500,000		1,253,864,000
Total	42,821,803,000		38,126,298,000
Accumulated depreciation, depletion and amortization	(18,880,611,000)		(16,849,068,000)
Net capitalized costs	$ 23,941,192,000		$ 21,277,230,000
Crude Oil (Bbl) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	700,818,000	[1]	517,493,000	[1]	385,922,000	[1]
Revisions of previous estimates	50,669,000	[1]	1,688,000	[1]	(25,756,000)	[1]
Purchases in place	1,097,000	[1]	1,010,000	[1]	9,000	[1]
Extensions, discoveries and other additions	230,754,000	[1]	255,686,000	[1]	203,001,000	[1]
Sales in place	(2,337,000)	[1]	(17,264,000)	[1]	(4,301,000)	[1]
Production	(80,461,000)	[1]	(57,795,000)	[1]	(41,382,000)	[1]
Net proved reserves - end of period	900,540,000	[1]	700,818,000	[1]	517,493,000	[1]
Proved Developed And Undeveloped Reserves (Boe) [Rollforward]
Sales in place	15,000,000	[1]	90,000,000	[1]	68,000,000	[1],[2]
Additions of proved reserves from drilling activities and technical evaluation of major proved areas	399,000,000	[1]	407,000,000	[1]	387,000,000	[1],[2]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	391,056,000		290,650,000		224,755,000		177,140,000
Net proved undeveloped reserves	509,484,000		410,168,000		292,738,000		208,782,000
Natural Gas Liquids (Bbl) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	319,963,000	[1]	227,788,000	[1]	151,909,000	[1]
Revisions of previous estimates	12,109,000	[1]	47,856,000	[1]	36,042,000	[1]
Purchases in place	1,202,000	[1]	612,000	[1]	17,000	[1]
Extensions, discoveries and other additions	69,197,000	[1]	71,574,000	[1]	65,288,000	[1]
Sales in place	(1,471,000)	[1]	(7,377,000)	[1]	(10,008,000)	[1]
Production	(23,794,000)	[1]	(20,490,000)	[1]	(15,460,000)	[1]
Net proved reserves - end of period	377,206,000	[1]	319,963,000	[1]	227,788,000	[1]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	200,860,000		162,593,000		125,363,000		92,876,000
Net proved undeveloped reserves	176,346,000		157,370,000		102,425,000		59,033,000
Natural Gas (cf) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	4,739,500,000,000	[3]	7,850,900,000,000	[3]	8,470,200,000,000	[3]
Revisions of previous estimates	277,300,000,000	[3]	(2,653,000,000,000)	[3]	(416,700,000,000)	[3]
Purchases in place	5,700,000,000	[3]	14,800,000,000	[3]	3,000,000,000	[3]
Extensions, discoveries and other additions	594,100,000,000	[3]	478,100,000,000	[3]	713,800,000,000	[3]
Sales in place	(69,400,000,000)	[3]	(394,700,000,000)	[3]	(323,600,000,000)	[3]
Production	(502,400,000,000)	[3]	(556,600,000,000)	[3]	(595,800,000,000)	[3]
Net proved reserves - end of period	5,044,800,000,000	[3]	4,739,500,000,000	[3]	7,850,900,000,000	[3]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	3,213,400		2,979,500		4,155,600		4,457,800
Net proved undeveloped reserves	1,831,400		1,760,000		3,695,300		4,012,400
United States [Member]
Proved Developed And Undeveloped Reserves (Boe) [Rollforward]
Net proved reserves - beginning of period (Boe)	1,662,108,000	[1]	1,729,508,000	[1]	1,587,806,000	[1]
Revisions of previous estimates	113,823,000	[1]	(237,936,000)	[1]	(42,526,000)	[1]
Purchases in place	3,241,000	[1]	4,098,000	[1]	521,000	[1]
Extensions, discoveries and other additions	383,324,000	[1]	392,196,000	[1]	373,602,000	[1]
Sales in place	(15,375,000)	[1]	(87,588,000)	[1]	(68,247,000)	[1]
Production	(157,955,000)	[1]	(138,170,000)	[1]	(121,648,000)	[1]
Net proved reserves - end of period (Boe)	1,989,166,000	[1]	1,662,108,000	[1]	1,729,508,000	[1]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves (BOE)	1,015,359,000		840,564,000		877,301,000		839,928,000
Net proved undeveloped reserve (BOE)	973,807,000		821,544,000		852,207,000		747,878,000
Revisions of previous estimates	113,823,000	[1]	(237,936,000)	[1]	(42,526,000)	[1]
United States [Member] | Crude Oil (Bbl) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	671,029,000	[1]	495,296,000	[1]	355,457,000	[1]
Revisions of previous estimates	57,668,000	[1]	4,105,000	[1]	(21,188,000)	[1]
Purchases in place	1,097,000	[1]	1,010,000	[1]	9,000	[1]
Extensions, discoveries and other additions	230,023,000	[1]	241,171,000	[1]	202,552,000	[1]
Sales in place	(2,337,000)	[1]	(15,921,000)	[1]	(4,301,000)	[1]
Production	(77,431,000)	[1]	(54,632,000)	[1]	(37,233,000)	[1]
Net proved reserves - end of period	880,049,000	[1]	671,029,000	[1]	495,296,000	[1]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	382,517,000		281,167,000		213,872,000		161,907,000
Net proved undeveloped reserves	497,532,000		389,862,000		281,424,000		193,550,000
United States [Member] | Natural Gas Liquids (Bbl) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	318,406,000	[1]	226,586,000	[1]	150,434,000	[1]
Revisions of previous estimates	12,157,000	[1]	47,293,000	[1]	35,999,000	[1]
Purchases in place	1,202,000	[1]	612,000	[1]	17,000	[1]
Extensions, discoveries and other additions	69,187,000	[1]	71,396,000	[1]	65,288,000	[1]
Sales in place	(1,471,000)	[1]	(7,300,000)	[1]	(10,008,000)	[1]
Production	(23,479,000)	[1]	(20,181,000)	[1]	(15,144,000)	[1]
Net proved reserves - end of period	376,002,000	[1]	318,406,000	[1]	226,586,000	[1]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	199,964,000		161,482,000		124,271,000		91,401,000
Net proved undeveloped reserves	176,038,000		156,924,000		102,315,000		59,033,000
United States [Member] | Natural Gas (cf) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	4,036,000,000,000	[3]	6,045,800,000,000	[3]	6,491,500,000,000	[3]
Revisions of previous estimates	264,000,000,000	[3]	(1,736,000,000,000)	[3]	(344,000,000,000)	[3]
Purchases in place	5,700,000,000	[3]	14,800,000,000	[3]	3,000,000,000	[3]
Extensions, discoveries and other additions	504,700,000,000	[3]	477,800,000,000	[3]	634,600,000,000	[3]
Sales in place	(69,400,000,000)	[3]	(386,200,000,000)	[3]	(323,600,000,000)	[3]
Production	(342,300,000,000)	[3]	(380,200,000,000)	[3]	(415,700,000,000)	[3]
Net proved reserves - end of period	4,398,700,000,000	[3]	4,036,000,000,000	[3]	6,045,800,000,000	[3]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	2,597,300		2,387,500		3,235,000		3,519,700
Net proved undeveloped reserves	1,801,400		1,648,500		2,810,800		2,971,800
Canada [Member]
Proved Developed And Undeveloped Reserves (Boe) [Rollforward]
Net proved reserves - beginning of period (Boe)	35,804,000	[1]	192,448,000	[1]	216,084,000	[1]
Revisions of previous estimates	(676,000)	[1]	(151,015,000)	[1]	(12,865,000)	[1]
Purchases in place	0	[1]	0	[1]	0	[1]
Extensions, discoveries and other additions	693,000	[1]	5,860,000	[1]	448,000	[1]
Sales in place	0	[1]	(2,832,000)	[1]	0	[1]
Production	(7,482,000)	[1]	(8,657,000)	[1]	(11,219,000)	[1]
Net proved reserves - end of period (Boe)	28,339,000	[1]	35,804,000	[1]	192,448,000	[1]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves (BOE)	24,782,000		24,348,000		58,524,000		79,701,000
Net proved undeveloped reserve (BOE)	3,557,000		11,456,000		133,924,000		136,383,000
Revisions of previous estimates	(676,000)	[1]	(151,015,000)	[1]	(12,865,000)	[1]
Canada [Member] | Crude Oil (Bbl) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	17,863,000	[1]	18,592,000	[1]	25,636,000	[1]
Revisions of previous estimates	(5,866,000)	[1]	(2,493,000)	[1]	(4,611,000)	[1]
Purchases in place	0	[1]	0	[1]	0	[1]
Extensions, discoveries and other additions	673,000	[1]	5,681,000	[1]	449,000	[1]
Sales in place	0	[1]	(1,343,000)	[1]	0	[1]
Production	(2,550,000)	[1]	(2,574,000)	[1]	(2,882,000)	[1]
Net proved reserves - end of period	10,120,000	[1]	17,863,000	[1]	18,592,000	[1]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	6,871,000		6,853,000		8,128,000		11,283,000
Net proved undeveloped reserves	3,249,000		11,010,000		10,464,000		14,353,000
Canada [Member] | Natural Gas Liquids (Bbl) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	1,557,000	[1]	1,202,000	[1]	1,475,000	[1]
Revisions of previous estimates	(48,000)	[1]	563,000	[1]	43,000	[1]
Purchases in place	0	[1]	0	[1]	0	[1]
Extensions, discoveries and other additions	10,000	[1]	178,000	[1]	0	[1]
Sales in place	0	[1]	(77,000)	[1]	0	[1]
Production	(315,000)	[1]	(309,000)	[1]	(316,000)	[1]
Net proved reserves - end of period	1,204,000	[1]	1,557,000	[1]	1,202,000	[1]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	896,000		1,111,000		1,092,000		1,475,000
Net proved undeveloped reserves	308,000		446,000		110,000		0
Canada [Member] | Natural Gas (cf) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	98,300,000,000	[3]	1,035,900,000,000	[3]	1,133,800,000,000	[3]
Revisions of previous estimates	31,400,000,000	[3]	(894,500,000,000)	[3]	(49,800,000,000)	[3]
Purchases in place	0	[3]	0	[3]	0	[3]
Extensions, discoveries and other additions	100,000,000	[3]	0	[3]	0	[3]
Sales in place	0	[3]	(8,500,000,000)	[3]	0	[3]
Production	(27,700,000,000)	[3]	(34,600,000,000)	[3]	(48,100,000,000)	[3]
Net proved reserves - end of period	102,100,000,000	[3]	98,300,000,000	[3]	1,035,900,000,000	[3]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	102,100		98,300		295,800		401,600
Net proved undeveloped reserves	0		0		740,100		732,200
Trinidad [Member]
Proved Developed And Undeveloped Reserves (Boe) [Rollforward]
Net proved reserves - beginning of period (Boe)	101,060,000	[1]	128,629,000	[1]	142,669,000	[1]
Revisions of previous estimates	(3,892,000)	[1]	(3,953,000)	[1]	(4,011,000)	[1]
Purchases in place	0	[1]	0	[1]	0	[1]
Extensions, discoveries and other additions	13,245,000	[1]	0	[1]	12,455,000	[1]
Sales in place	0	[1]	0	[1]	0	[1]
Production	(22,049,000)	[1]	(23,616,000)	[1]	(22,484,000)	[1]
Net proved reserves - end of period (Boe)	88,364,000	[1]	101,060,000	[1]	128,629,000	[1]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves (BOE)	83,933,000		81,826,000		103,710,000		90,382,000
Net proved undeveloped reserve (BOE)	4,431,000		19,234,000		24,919,000		52,287,000
Revisions of previous estimates	(3,892,000)	[1]	(3,953,000)	[1]	(4,011,000)	[1]
Trinidad [Member] | Crude Oil (Bbl) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	3,028,000	[1]	3,507,000	[1]	4,731,000	[1]
Revisions of previous estimates	(991,000)	[1]	71,000	[1]	18,000	[1]
Purchases in place	0	[1]	0	[1]	0	[1]
Extensions, discoveries and other additions	0	[1]	0	[1]	0	[1]
Sales in place	0	[1]	0	[1]	0	[1]
Production	(447,000)	[1]	(550,000)	[1]	(1,242,000)	[1]
Net proved reserves - end of period	1,590,000	[1]	3,028,000	[1]	3,507,000	[1]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	1,505,000		2,377,000		2,657,000		3,852,000
Net proved undeveloped reserves	85,000		651,000		850,000		879,000
Trinidad [Member] | Natural Gas Liquids (Bbl) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	0	[1]	0	[1]	0	[1]
Revisions of previous estimates	0	[1]	0	[1]	0	[1]
Purchases in place	0	[1]	0	[1]	0	[1]
Extensions, discoveries and other additions	0	[1]	0	[1]	0	[1]
Sales in place	0	[1]	0	[1]	0	[1]
Production	0	[1]	0	[1]	0	[1]
Net proved reserves - end of period	0	[1]	0	[1]	0	[1]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	0		0		0		0
Net proved undeveloped reserves	0		0		0		0
Trinidad [Member] | Natural Gas (cf) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	588,200,000,000	[3]	750,700,000,000	[3]	827,600,000,000	[3]
Revisions of previous estimates	(17,400,000,000)	[3]	(24,100,000,000)	[3]	(24,200,000,000)	[3]
Purchases in place	0	[3]	0	[3]	0	[3]
Extensions, discoveries and other additions	79,500,000,000	[3]	0	[3]	74,700,000,000	[3]
Sales in place	0	[3]	0	[3]	0	[3]
Production	(129,600,000,000)	[3]	(138,400,000,000)	[3]	(127,400,000,000)	[3]
Net proved reserves - end of period	520,700,000,000	[3]	588,200,000,000	[3]	750,700,000,000	[3]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	494,600		476,700		606,300		519,200
Net proved undeveloped reserves	26,100		111,500		144,400		308,400
Other International [Member]
Proved Developed And Undeveloped Reserves (Boe) [Rollforward]
Net proved reserves - beginning of period (Boe)	11,726,000	[1],[2]	3,178,000	[1],[2]	2,976,000	[1],[2]
Revisions of previous estimates	(265,000)	[1],[2]	283,000	[1],[2]	239,000	[1],[2]
Purchases in place	0	[1],[2]	0	[1],[2]	0	[1],[2]
Extensions, discoveries and other additions	1,703,000	[1],[2]	8,876,000	[1],[2]	750,000	[1],[2]
Sales in place	0	[1],[2]	0	[1],[2]	0	[1],[2]
Production	(490,000)	[1],[2]	(611,000)	[1],[2]	(787,000)	[1],[2]
Net proved reserves - end of period (Boe)	12,674,000	[1],[2]	11,726,000	[1],[2]	3,178,000	[1],[2]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves (BOE)	3,402,000	[2]	3,081,000	[2]	3,178,000	[2]	2,976,000	[2]
Net proved undeveloped reserve (BOE)	9,272,000	[2]	8,645,000	[2]	0	[2]	0	[2]
Revisions of previous estimates	(265,000)	[1],[2]	283,000	[1],[2]	239,000	[1],[2]
Other International [Member] | Crude Oil (Bbl) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	8,898,000	[1],[2]	98,000	[1],[2]	98,000	[1],[2]
Revisions of previous estimates	(142,000)	[1],[2]	5,000	[1],[2]	25,000	[1],[2]
Purchases in place	0	[1],[2]	0	[1],[2]	0	[1],[2]
Extensions, discoveries and other additions	58,000	[1],[2]	8,834,000	[1],[2]	0	[1],[2]
Sales in place	0	[1],[2]	0	[1],[2]	0	[1],[2]
Production	(33,000)	[1],[2]	(39,000)	[1],[2]	(25,000)	[1],[2]
Net proved reserves - end of period	8,781,000	[1],[2]	8,898,000	[1],[2]	98,000	[1],[2]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	163,000	[2]	253,000	[2]	98,000	[2]	98,000	[2]
Net proved undeveloped reserves	8,618,000	[2]	8,645,000	[2]	0	[2]	0	[2]
Other International [Member] | Natural Gas Liquids (Bbl) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	0	[1],[2]	0	[1],[2]	0	[1],[2]
Revisions of previous estimates	0	[1],[2]	0	[1],[2]	0	[1],[2]
Purchases in place	0	[1],[2]	0	[1],[2]	0	[1],[2]
Extensions, discoveries and other additions	0	[1],[2]	0	[1],[2]	0	[1],[2]
Sales in place	0	[1],[2]	0	[1],[2]	0	[1],[2]
Production	0	[1],[2]	0	[1],[2]	0	[1],[2]
Net proved reserves - end of period	0	[1],[2]	0	[1],[2]	0	[1],[2]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	0	[2]	0	[2]	0	[2]	0	[2]
Net proved undeveloped reserves	0	[2]	0	[2]	0	[2]	0	[2]
Other International [Member] | Natural Gas (cf) [Member]
Proved Developed and Undeveloped Reserves [Rollforward]
Net proved reserves - beginning of period	17,000,000,000	[2],[3]	18,500,000,000	[2],[3]	17,300,000,000	[2],[3]
Revisions of previous estimates	(700,000,000)	[2],[3]	1,600,000,000	[2],[3]	1,300,000,000	[2],[3]
Purchases in place	0	[2],[3]	0	[2],[3]	0	[2],[3]
Extensions, discoveries and other additions	9,800,000,000	[2],[3]	300,000,000	[2],[3]	4,500,000,000	[2],[3]
Sales in place	0	[2],[3]	0	[2],[3]	0	[2],[3]
Production	(2,800,000,000)	[2],[3]	(3,400,000,000)	[2],[3]	(4,600,000,000)	[2],[3]
Net proved reserves - end of period	23,300,000,000	[2],[3]	17,000,000,000	[2],[3]	18,500,000,000	[2],[3]
Net Proved Developed and Undeveloped Reserves [Abstract]
Net proved developed reserves	19,400	[2]	17,000	[2]	18,500	[2]	17,300	[2]
Net proved undeveloped reserves	3,900	[2]	0	[2]	0	[2]	0	[2]

[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 the ratio of 1.0 barrel of crude oil and condensate or NGLs to 6.0 thousand cubic feet of natural gas.

[2] Other International includes EOG's United Kingdom, China and Argentina operations.

[3] Billion cubic feet.