Oil and Gas Exploration and Production Industries Disclosures, Discounted Future Net Cash Flows (Details) $ in Millions		12 Months Ended
		Dec. 31, 2021 USD ($)		Dec. 31, 2020 USD ($)		Dec. 31, 2019 USD ($)
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows		$ 167,451	[1]	$ 74,909	[2]	$ 121,478
Future production costs		(45,163)		(34,826)		(42,641)
Future development costs		(14,265)		(15,404)		(20,586)
Future income taxes		(22,915)		(4,442)		(11,566)
Future net cash flows		85,108		20,237		46,685
Discount to present value at 10% annual rate		(38,922)		(8,547)		(21,164)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves		$ 46,186		$ 11,690		$ 25,521
Annual Rate of Discount to Present Value		10.00%		10.00%		10.00%
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at Beginning of Period		$ 11,690		$ 25,521		$ 32,426
Sales and transfers of oil and gas produced, net of production costs		(11,809)		(4,579)		(8,210)
Net changes in prices and production costs		37,220		(18,446)		(10,880)
Extensions, discoveries, additions and improved recovery, net of related costs		12,225		1,501		5,709
Development costs incurred		1,635		1,675		3,033
Revisions of estimated development cost		2,640		4,138		(739)
Revisions of previous quantity estimates		(1,716)		(3,297)		(696)
Accretion of discount		1,372		3,104		3,950
Net change in income taxes		(9,870)		3,488		1,549
Purchases of reserves in place		151		49		99
Sales of reserves in place		(170)		(156)		(51)
Changes in timing and other		2,818		(1,308)		(669)
Balance at End of Period		46,186		11,690		25,521
United States
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows		166,316	[1]	73,727	[2]	120,360
Future production costs		(44,905)		(34,619)		(42,387)
Future development costs		(13,885)		(15,159)		(20,356)
Future income taxes		(22,831)		(4,337)		(11,460)
Future net cash flows		84,695		19,612		46,157
Discount to present value at 10% annual rate		(38,834)		(8,410)		(21,043)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves		45,861		11,202		25,114
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at Beginning of Period		11,202		25,114		32,033
Sales and transfers of oil and gas produced, net of production costs		(11,532)		(4,382)		(7,955)
Net changes in prices and production costs		37,088		(18,625)		(10,974)
Extensions, discoveries, additions and improved recovery, net of related costs		12,154		1,437		5,608
Development costs incurred		1,619		1,675		3,004
Revisions of estimated development cost		2,773		4,149		(599)
Revisions of previous quantity estimates		(1,789)		(3,307)		(813)
Accretion of discount		1,313		3,055		3,892
Net change in income taxes		(9,914)		3,497		1,454
Purchases of reserves in place		151		49		99
Sales of reserves in place		(19)		(156)		(51)
Changes in timing and other		2,815		(1,304)		(584)
Balance at End of Period		$ 45,861		$ 11,202		$ 25,114
United States | Crude Oil
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Per unit price used to calculate future cash inflows		67.79		37.19		57.51
United States | Natural Gas Liquids (MMBbl)
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Per unit price used to calculate future cash inflows		30.28		12.47		16.91
United States | Natural Gas
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Per unit price used to calculate future cash inflows		4.61		1.45		2.07
Trinidad
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows		$ 1,135	[1]	$ 901	[2]	$ 813
Future production costs		(258)		(153)		(166)
Future development costs		(380)		(227)		(212)
Future income taxes		(84)		(81)		(74)
Future net cash flows		413		440		361
Discount to present value at 10% annual rate		(88)		(101)		(86)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves		325		339		275
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at Beginning of Period		339		275		266
Sales and transfers of oil and gas produced, net of production costs		(261)		(152)		(235)
Net changes in prices and production costs		133		132		66
Extensions, discoveries, additions and improved recovery, net of related costs		71		64		85
Development costs incurred		16		0		23
Revisions of estimated development cost		(133)		(11)		(129)
Revisions of previous quantity estimates		73		12		116
Accretion of discount		42		34		43
Net change in income taxes		27		(12)		94
Purchases of reserves in place		0		0		0
Sales of reserves in place		0		0		0
Changes in timing and other		18		(3)		(54)
Balance at End of Period		$ 325		$ 339		$ 275
Trinidad | Crude Oil
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Per unit price used to calculate future cash inflows		58.32		26.75		46.77
Trinidad | Natural Gas
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Per unit price used to calculate future cash inflows		3.28		3.28		2.90
Other International (1)
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future cash inflows	[3]	$ 0	[1]	$ 281	[2]	$ 305
Future production costs	[3]	0		(54)		(88)
Future development costs	[3]	0		(18)		(18)
Future income taxes	[3]	0		(24)		(32)
Future net cash flows	[3]	0		185		167
Discount to present value at 10% annual rate	[3]	0		(36)		(35)
Standardized measure of discounted future net cash flows relating to proved oil and gas reserves	[3]	0		149		132
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Roll Forward]
Balance at Beginning of Period	[3]	149		132		127
Sales and transfers of oil and gas produced, net of production costs	[3]	(16)		(45)		(20)
Net changes in prices and production costs	[3]	(1)		47		28
Extensions, discoveries, additions and improved recovery, net of related costs	[3]	0		0		16
Development costs incurred	[3]	0		0		6
Revisions of estimated development cost	[3]	0		0		(11)
Revisions of previous quantity estimates	[3]	0		(2)		1
Accretion of discount	[3]	17		15		15
Net change in income taxes	[3]	17		3		1
Purchases of reserves in place	[3]	0		0		0
Sales of reserves in place	[3]	(151)		0		0
Changes in timing and other	[3]	(15)		(1)		(31)
Balance at End of Period	[3]	$ 0		$ 149		$ 132
Other International (1) | Crude Oil
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Per unit price used to calculate future cash inflows				41.87		57.22
Other International (1) | Natural Gas
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Per unit price used to calculate future cash inflows				5.65		5.01

[1] Estimated crude oil prices used to calculate 2020 future cash inflows for the United States, Trinidad and Other International were $37.19, $26.75, and $41.87, respectively. Estimated NGL price used to calculate 2020 future cash inflows for the United States was $12.47. Estimated natural gas prices used to calculate 2020 future cash inflows for the United States, Trinidad and Other International were $1.45, $3.28, and $5.65, respectively.

[2] Estimated crude oil prices used to calculate 2019 future cash inflows for the United States, Trinidad and Other International were $57.51, $46.77 and $57.22, respectively. Estimated NGL price used to calculate 2019 future cash inflows for the United States was $16.91. Estimated natural gas prices used to calculate 2019 future cash inflows for the United States, Trinidad and Other International were $2.07, $2.90 and $5.01, respectively.

[3] Other International includes EOG's China and Canada operations. The China operations were sold in the second quarter of 2021.(2)Estimated crude oil prices used to calculate 2021 future cash inflows for the United States and Trinidad were $67.79 and $58.32, respectively. Estimated NGL price used to calculate 2021 future cash inflows for the United States was $30.28. Estimated natural gas prices used to calculate 2021 future cash inflows for the United States and Trinidad were $4.61 and $3.28, respectively.