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Supplementary Oil and Gas Information (Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |
Balance, Beginning of Year | $ 13,672 | $ 16,082 | $ 27,499
Sales of oil and gas produced during the year | (4,360) | (4,564) | (5,036)
Discoveries and extensions, net of related costs | 703 | 2,258 | 2,200
Purchases of proved reserves in place | 1,494 | 34 | 2,464
Sales and transfers of proved reserves in place | (1,551) | (11) | (1,765)
Net change in prices and production costs | (2,566) | (3,404) | (12,597)
Revisions to quantity estimates | 811 | (925) | (5,393)
Accretion of discount | 1,540 | 1,835 | 3,384
Development costs incurred during the year | 2,170 | 2,291 | 2,759
Changes in estimated future development costs | 692 | (460) | (1,504)
Other | (1) | (1) | 1
Net change in income taxes | 310 | 537 | 4,070
Balance, End of Year | 12,914 | 13,672 | 16,082
United States [Member] |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |
Balance, Beginning of Year | 12,860 | 11,775 | 18,968
Sales of oil and gas produced during the year | (3,163) | (3,984) | (3,969)
Discoveries and extensions, net of related costs | 338 | 2,106 | 1,141
Purchases of proved reserves in place | 587 | 34 | 2,440
Sales and transfers of proved reserves in place | (1,551) | (11) | (1,765)
Net change in prices and production costs | (3,678) | (1,704) | (5,730)
Revisions to quantity estimates | 90 | 2,148 | (5,250)
Accretion of discount | 1,451 | 1,286 | 2,290
Development costs incurred during the year | 1,555 | 1,850 | 2,184
Changes in estimated future development costs | 1,053 | (67) | (1,384)
Other | (1) | 0 | 1
Net change in income taxes | 354 | (573) | 2,849
Balance, End of Year | 9,895 | 12,860 | 11,775
Canada [Member] |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |
Balance, Beginning of Year | 812 | 4,307 | 8,531
Sales of oil and gas produced during the year | (1,197) | (580) | (1,067)
Discoveries and extensions, net of related costs | 365 | 152 | 1,059
Purchases of proved reserves in place | 907 | 0 | 24
Sales and transfers of proved reserves in place | 0 | 0 | 0
Net change in prices and production costs | 1,112 | (1,700) | (6,867)
Revisions to quantity estimates | 721 | (3,073) | (143)
Accretion of discount | 89 | 549 | 1,094
Development costs incurred during the year | 615 | 441 | 575
Changes in estimated future development costs | (361) | (393) | (120)
Other | (0) | (1) | 0
Net change in income taxes | (44) | 1,110 | 1,221
Balance, End of Year | $ 3,019 | $ 812 | $ 4,307

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Form 20-F -Number Part II -Section Item 18 -Subparagraph (Instruction 2) -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477916/932-235-55-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 35A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-35A Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-34 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 35A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-35A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 35A -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-35A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 35 -Subparagraph (d) -SubTopic 235 -Topic 932 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-35 + Details
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