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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved $ 341 $ 15,091 $ 50
Property acquisitions, unproved 251 321 0
Exploration 151 127 26
Development 3,567 4,109 4,427
Costs incurred 4,310 19,648 4,503
North Sea      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved 127 0 0
Property acquisitions, unproved 0 0 0
Exploration 0 0 0
Development 110 255 186
Costs incurred 237 255 186
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 (89) 0 0
Exploration 35 15 9
Development 212 101 116
Costs incurred 158 116 125
North America      
Costs Incurred In Oil And Gas Property Acquisition, Exploration, And Development Activities1 [Line Items]      
Property acquisitions, proved 214 15,091 50
Property acquisitions, unproved 340 321 0
Exploration 116 112 17
Development 3,245 3,753 4,125
Costs incurred $ 3,915 $ 19,277 $ 4,192