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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved $ 750 $ 3,405 $ 341
Property acquisitions, unproved 15 91 251
Exploration 37 71 151
Development 2,536 5,269 3,567
Costs incurred 3,338 8,836 4,310
North America      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved 750 3,405 214
Property acquisitions, unproved 15 91 340
Exploration 22 38 116
Development 2,338 4,687 3,245
Costs incurred 3,125 8,221 3,915
North Sea      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved 0 0 127
Property acquisitions, unproved 0 0 0
Exploration 0 0 0
Development 104 349 110
Costs incurred 104 349 237
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 (89)
Exploration 15 33 35
Development 94 233 212
Costs incurred $ 109 $ 266 $ 158