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Supplementary Oil and Gas Information (Capitalized Costs) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |
Proved Oil and Gas Properties | $ 70,133 | $ 66,009 | $ 64,084
Unproved Oil and Gas Properties | 434 | 764 | 1,486
Total Capital Cost | 70,567 | 66,773 | 65,570
Accumulated DD&A | 56,457 | 52,591 | 51,131
Net Capitalized Costs | 14,110 | 14,182 | 14,439
United States [Member] |  |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |
Proved Oil and Gas Properties | 50,573 | 50,246 | 47,440
Unproved Oil and Gas Properties | 316 | 741 | 1,449
Total Capital Cost | 50,889 | 50,987 | 48,889
Accumulated DD&A | 39,294 | 37,770 | 35,799
Net Capitalized Costs | 11,595 | 13,217 | 13,090
Canada [Member] |  |  |
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items] |  |  |
Proved Oil and Gas Properties | 19,560 | 15,763 | 16,644
Unproved Oil and Gas Properties | 118 | 23 | 37
Total Capital Cost | 19,678 | 15,786 | 16,681
Accumulated DD&A | 17,163 | 14,821 | 15,332
Net Capitalized Costs | $ 2,515 | $ 965 | $ 1,349

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- Definition Amount, before accumulated depreciation, depletion, amortization, and valuation allowance, of capitalized cost for mineral interest in proved property in oil- and gas-producing activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-15 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-15 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 932 -SubTopic 235 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477215/932-235-50-13 + Details
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