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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, 2021
Dec. 31, 2020
Dec. 31, 2019
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 $ (16,149) $ (6,127) $ (11,807)
Net changes in sales prices and production costs 74,558 (46,055) (3,515)
Extensions, discoveries and improved recovery 2,948 626 5,883
Changes in estimated future development costs (2,773) (153) (1,889)
Purchases of proved reserves in place 4,010 947 7,418
Sales of proved reserves in place (1) (1) 0
Revisions of previous reserve estimates (186) 5,295 (3,384)
Accretion of discount 3,460 7,718 8,062
Changes in production timing and other 6,638 (4,830) 447
Net change in income taxes (17,232) 6,566 1,984
Net change 55,273 (36,014) 3,199
Balance - beginning of year 27,511 63,525 60,326
Balance - end of year $ 82,784 $ 27,511 $ 63,525