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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, 2022
Dec. 31, 2021
Dec. 31, 2020
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 $ (23,242) $ (16,149) $ (6,127)
Net changes in sales prices and production costs 79,291 74,558 (46,055)
Extensions, discoveries and improved recovery 6,198 2,948 626
Changes in estimated future development costs (3,640) (2,773) (153)
Purchases of proved reserves in place 5,745 4,010 947
Sales of proved reserves in place 0 (1) (1)
Revisions of previous reserve estimates (9,956) (186) 5,295
Accretion of discount 10,712 3,460 7,718
Changes in production timing and other 5,463 6,638 (4,830)
Net change in income taxes (16,357) (17,232) 6,566
Net change 54,214 55,273 (36,014)
Balance - beginning of year 82,784 27,511 63,525
Balance - end of year $ 136,998 $ 82,784 $ 27,511