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Supplementary Oil And Gas Information (Unaudited) - Sources of Change in the Standardized Measure of Discounted Future Net Cash Flows (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Increase (Decrease) in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves 1 [Roll Forward]      
Sales of crude oil and natural gas produced, net of production costs $ (17,672) $ (18,174) $ (23,242)
Net changes in sales prices and production costs (11,189) (47,145) 79,291
Extensions, discoveries and improved recovery 2,576 8,196 6,198
Changes in estimated future development costs (2,101) (1,511) (3,640)
Purchases of proved reserves in place 15,463 0 5,745
Sales of proved reserves in place (63) (47) 0
Revisions of previous reserve estimates (485) 6,647 (9,956)
Accretion of discount 14,059 17,769 10,712
Changes in production timing and other 2,507 (2,831) 5,463
Net change in income taxes 327 8,834 (16,357)
Net change 3,422 (28,262) 54,214
Balance - beginning of year 108,736 136,998 82,784
Balance - end of year $ 112,158 $ 108,736 $ 136,998