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Supplementary Oil And Gas Information (Unaudited) - Future Net Cash Flows Relating to Proved Crude Oil and Natural Gas Reserves (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items] |  |  |  |
Future cash inflows | $ 882,968 | $ 870,755 | $ 995,482 |
Future production costs | (288,515) | (279,014) | (305,959) |
Future development costs and asset retirement obligations | (96,229) | (90,415) | (86,658) |
Future income taxes | (110,342) | (113,057) | (137,288) |
Future net cash flows | 387,882 | 388,269 | 465,577 |
10% annual discount for timing of future cash flows | (275,724) | (279,533) | (328,579) |
Standardized measure of future net cash flows (1) | 112,158 | 108,736 | 136,998 | $ 82,784
North America |  |  |  |
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items] |  |  |  |
Future cash inflows | 876,917 | 863,544 | 986,672 |
Future production costs | (286,440) | (276,498) | (303,270) |
Future development costs and asset retirement obligations | (92,455) | (86,615) | (83,803) |
Future income taxes | (111,073) | (113,516) | (136,905) |
Future net cash flows | 386,949 | 386,915 | 462,694 |
10% annual discount for timing of future cash flows | (275,139) | (278,814) | (327,333) |
Standardized measure of future net cash flows (1) | 111,810 | 108,101 | 135,361 |
North Sea |  |  |  |
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items] |  |  |  |
Future cash inflows | 722 | 1,067 | 1,506 |
Future production costs | (414) | (636) | (691) |
Future development costs and asset retirement obligations | (1,970) | (1,873) | (1,416) |
Future income taxes | 1,144 | 967 | 517 |
Future net cash flows | (518) | (475) | (84) |
10% annual discount for timing of future cash flows | 136 | 168 | 84 |
Standardized measure of future net cash flows (1) | (382) | (307) | 0 |
Offshore Africa |  |  |  |
Oil and Gas, Standardized Measure, Discounted Future Net Cash Flow [Line Items] |  |  |  |
Future cash inflows | 5,329 | 6,144 | 7,304 |
Future production costs | (1,661) | (1,880) | (1,998) |
Future development costs and asset retirement obligations | (1,804) | (1,927) | (1,439) |
Future income taxes | (413) | (508) | (900) |
Future net cash flows | 1,451 | 1,829 | 2,967 |
10% annual discount for timing of future cash flows | (721) | (887) | (1,330) |
Standardized measure of future net cash flows (1) | $ 730 | $ 942 | $ 1,637 |

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- Definition Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Development Costs and Asset Retirement Obligations + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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 + Details
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- Definition Amount of estimated future accumulated cash inflow from the sale 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 + Details
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- Definition Amount of estimated future accumulated cash outflow for income tax, based on the future income less future expense derived from production and sale 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 + Details
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- Definition Amount, after future accumulated cash outflow for development and production costs and future income tax, of estimated future accumulated cash inflow from the sale 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 + Details
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- Definition Amount of estimated future accumulated cash outflow for costs to be incurred in producing 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 + Details
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