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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved $ 1,371 $ 750 $ 3,405
Property acquisitions, unproved 26 15 91
Exploration 12 37 71
Development 4,557 2,536 5,269
Costs incurred 5,966 3,338 8,836
North America      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved 1,371 750 3,405
Property acquisitions, unproved 26 15 91
Exploration 4 22 38
Development 4,301 2,338 4,687
Costs incurred 5,702 3,125 8,221
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 208 104 349
Costs incurred 208 104 349
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 8 15 33
Development 48 94 233
Costs incurred $ 56 $ 109 $ 266