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Oil and Gas Exploration and Production Industries Disclosures, Discounted Future Net Cash Flows (Details) $ in Millions | 12 Months Ended
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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.

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