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Supplementary Oil And Gas Information (Unaudited) - Costs Incurred in Crude Oil and Natural Gas Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Proved $ 0 $ 524 $ 1,371
Unproved 0 0 26
Exploration 46 45 12
Development 5,784 4,766 4,557
Costs incurred 5,830 5,335 5,966
North America      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Proved 0 524 1,371
Unproved 0 0 26
Exploration 43 40 4
Development 5,039 4,387 4,301
Costs incurred 5,082 4,951 5,702
North Sea      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Proved 0 0 0
Unproved 0 0 0
Exploration 0 0 0
Development 558 304 208
Costs incurred 558 304 208
Offshore Africa      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Proved 0 0 0
Unproved 0 0 0
Exploration 3 5 8
Development 187 75 48
Costs incurred $ 190 $ 80 $ 56