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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved $ 524 $ 1,371 $ 750
Property acquisitions, unproved 0 26 15
Exploration 45 12 37
Development 4,766 4,557 2,536
Costs incurred 5,335 5,966 3,338
North America      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved 524 1,371 750
Property acquisitions, unproved 0 26 15
Exploration 40 4 22
Development 4,387 4,301 2,338
Costs incurred 4,951 5,702 3,125
North Sea      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved 0 0 0
Property acquisitions, unproved 0 0 0
Exploration 0 0 0
Development 304 208 104
Costs incurred 304 208 104
Offshore Africa      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved 0 0 0
Property acquisitions, unproved 0 0 0
Exploration 5 8 15
Development 75 48 94
Costs incurred $ 80 $ 56 $ 109