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Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance $ 27,834 $ 28,698
Ending Balance 25,411 27,834
Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 36,356 35,224
Adjustment for Change in Accounting Policy   (4)
Additions 811 1,116
Transfers From E&E Assets (Note 17) 47  
Change in Decommissioning Liabilities (6) 354
Exchange Rate Movements and Other (159) (294)
Divestitures (3) (40)
Ending Balance 37,046 36,356
Accumulated Depreciation, Depletion and Amortization [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 8,522 6,526
Adjustment for Change in Accounting Policy   (1)
Depreciation, Depletion and Amortization 2,119 2,051
Impairment Charges 1,109 30
Exchange Rate Movements and Other (115) (55)
Divestitures   (29)
Ending Balance 11,635 8,522
Development & Production Upstream Assets [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 23,357 24,128
Ending Balance 21,465 23,357
Development & Production Upstream Assets [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 29,032 28,046
Additions 475 695
Transfers From E&E Assets (Note 17) 6  
Change in Decommissioning Liabilities (11) 340
Exchange Rate Movements and Other (6) (9)
Divestitures (3) (40)
Ending Balance 29,493 29,032
Development & Production Upstream Assets [Member] | Accumulated Depreciation, Depletion and Amortization [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 5,675 3,918
Depreciation, Depletion and Amortization 1,768 1,735
Impairment Charges 607 20
Exchange Rate Movements and Other (22) 31
Divestitures   (29)
Ending Balance 8,028 5,675
Other Upstream Assets [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Ending Balance 41  
Other Upstream Assets [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 333 333
Transfers From E&E Assets (Note 17) 41  
Ending Balance 374 333
Other Upstream Assets [Member] | Accumulated Depreciation, Depletion and Amortization [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 333 333
Ending Balance 333 333
Refining Equipment [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 3,981 4,190
Ending Balance 3,476 3,981
Refining Equipment [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 5,577 5,632
Adjustment for Change in Accounting Policy   (4)
Additions 243 228
Change in Decommissioning Liabilities 3 9
Exchange Rate Movements and Other (152) (288)
Ending Balance 5,671 5,577
Refining Equipment [Member] | Accumulated Depreciation, Depletion and Amortization [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 1,596 1,442
Adjustment for Change in Accounting Policy   (1)
Depreciation, Depletion and Amortization 242 241
Impairment Charges 450  
Exchange Rate Movements and Other (93) (86)
Ending Balance 2,195 1,596
Other [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 496 380
Ending Balance 429 496
Other [Member] | Cost [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 1,414 1,213
Additions 93 193
Change in Decommissioning Liabilities 2 5
Exchange Rate Movements and Other (1) 3
Ending Balance 1,508 1,414
Other [Member] | Accumulated Depreciation, Depletion and Amortization [Member]    
Disclosure Of Property Plant And Equipment [Line Items]    
Beginning Balance 918 833
Depreciation, Depletion and Amortization 109 75
Impairment Charges 52 10
Ending Balance $ 1,079 $ 918