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SUPPLEMENTARY OIL & GAS INFORMATION (Unaudited) - Costs Incurred in Crude Oil and Natural Gas Activities (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved $ 3,405 $ 341 $ 15,091
Property acquisitions, unproved 91 251 321
Exploration 71 151 127
Development 5,269 3,567 4,109
Costs incurred 8,836 4,310 19,648
North America      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved 3,405 214 15,091
Property acquisitions, unproved 91 340 321
Exploration 38 116 112
Development 4,687 3,245 3,753
Costs incurred 8,221 3,915 19,277
North Sea      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved 0 127 0
Property acquisitions, unproved 0 0 0
Exploration 0 0 0
Development 349 110 255
Costs incurred 349 237 255
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 (89) 0
Exploration 33 35 15
Development 233 212 101
Costs incurred $ 266 $ 158 $ 116