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Supplementary Oil and Gas Information (Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves-Before Discounting) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future Cash Inflows | $ 56,558 | $ 59,244 | $ 67,643 |
Production costs | 20,237 | 19,081 | 22,552 |
Development costs | 9,899 | 11,806 | 11,113 |
Income taxes | 3,197 | 3,784 | 4,751 |
Future Net Cash Flows | 23,225 | 24,573 | 29,227 |
Less 10% annual discount for estimated timing of cash flows | 10,311 | 10,901 | 13,145 |
Discounted Future Net Cash Flows | 12,914 | 13,672 | 16,082 | $ 27,499
United States [Member] |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future Cash Inflows | 41,435 | 52,682 | 47,946 |
Production costs | 12,732 | 15,122 | 14,405 |
Development costs | 6,895 | 10,269 | 8,849 |
Income taxes | 3,042 | 3,690 | 2,735 |
Future Net Cash Flows | 18,766 | 23,601 | 21,957 |
Less 10% annual discount for estimated timing of cash flows | 8,871 | 10,741 | 10,182 |
Discounted Future Net Cash Flows | 9,895 | 12,860 | 11,775 | 18,968
Canada [Member] |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Future Cash Inflows | 15,123 | 6,562 | 19,697 |
Production costs | 7,505 | 3,959 | 8,147 |
Development costs | 3,004 | 1,537 | 2,264 |
Income taxes | 155 | 94 | 2,016 |
Future Net Cash Flows | 4,459 | 972 | 7,270 |
Less 10% annual discount for estimated timing of cash flows | 1,440 | 160 | 2,963 |
Discounted Future Net Cash Flows | $ 3,019 | $ 812 | $ 4,307 | $ 8,531

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