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Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance $ 25,411 $ 27,834
Ending Balance 34,225 25,411
COST    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 37,046 36,356
Acquisitions (Note 5) 13,380  
Additions 2,515 811
Transfers to Liabilities Related to Assets Held for Sale (Note 16)   47
Change in Decommissioning Liabilities 2 (6)
Exchange Rate Movements and Other (136) (159)
Divestitures (630) (3)
Transfers to Assets Held for Sale (Note 16) (1,276)  
Ending Balance 50,901 37,046
ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance (11,635) (8,522)
Depreciation, Depletion and Amortization 3,999 2,223
Impairment Charges (Note 10) (3) 1,931 1,005
Impairment Reversals (Note 10) (378)  
Exchange Rate Movements and Other (20) (115)
Divestitures 377  
Transfers to Assets Held for Sale (Note 16) (114)  
Ending Balance (16,676) (11,635)
Oil and Gas Properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 21,506 23,357
Ending Balance 27,531 21,506
Oil and Gas Properties | COST    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 29,867 29,365
Acquisitions (Note 5) 8,633  
Additions 1,368 475
Transfers to Liabilities Related to Assets Held for Sale (Note 16)   47
Change in Decommissioning Liabilities (63) (11)
Exchange Rate Movements and Other 22 (6)
Divestitures (630) (3)
Transfers to Assets Held for Sale (Note 16) (754)  
Ending Balance 38,443 29,867
Oil and Gas Properties | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance (8,361) (6,008)
Depreciation, Depletion and Amortization 3,335 1,820
Impairment Charges (Note 10) (3) 0 555
Impairment Reversals (Note 10) (378)  
Exchange Rate Movements and Other 61 (22)
Divestitures 377  
Transfers to Assets Held for Sale (Note 16) (90)  
Ending Balance (10,912) (8,361)
Processing, Transportation and Storage Assets    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 176 150
Ending Balance 175 176
Processing, Transportation and Storage Assets | COST    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 218 183
Acquisitions (Note 5) 0  
Additions 9 33
Transfers to Liabilities Related to Assets Held for Sale (Note 16)   0
Change in Decommissioning Liabilities 1 2
Exchange Rate Movements and Other 0 0
Divestitures 0 0
Transfers to Assets Held for Sale (Note 16) 0  
Ending Balance 228 218
Processing, Transportation and Storage Assets | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance (42) (33)
Depreciation, Depletion and Amortization 10 9
Impairment Charges (Note 10) (3) 0 0
Impairment Reversals (Note 10) 0  
Exchange Rate Movements and Other 1 0
Divestitures 0  
Transfers to Assets Held for Sale (Note 16) 0  
Ending Balance (53) (42)
Manufacturing Assets    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 3,476 3,981
Ending Balance 5,923 3,476
Manufacturing Assets | COST    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 5,671 5,577
Acquisitions (Note 5) 3,901  
Additions 1,023 243
Transfers to Liabilities Related to Assets Held for Sale (Note 16)   0
Change in Decommissioning Liabilities 40 3
Exchange Rate Movements and Other (140) (152)
Divestitures 0 0
Transfers to Assets Held for Sale (Note 16) 0  
Ending Balance 10,495 5,671
Manufacturing Assets | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance (2,195) (1,596)
Depreciation, Depletion and Amortization 526 242
Impairment Charges (Note 10) (3) 1,931 450
Impairment Reversals (Note 10) 0  
Exchange Rate Movements and Other (80) (93)
Divestitures 0  
Transfers to Assets Held for Sale (Note 16) 0  
Ending Balance (4,572) (2,195)
Retail and other    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 253 346
Ending Balance 596 253
Retail and other | COST    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance 1,290 1,231
Acquisitions (Note 5) 846  
Additions 115 60
Transfers to Liabilities Related to Assets Held for Sale (Note 16)   0
Change in Decommissioning Liabilities 24 0
Exchange Rate Movements and Other (18) (1)
Divestitures 0 0
Transfers to Assets Held for Sale (Note 16) (522)  
Ending Balance 1,735 1,290
Retail and other | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning Balance (1,037) (885)
Depreciation, Depletion and Amortization 128 152
Impairment Charges (Note 10) (3) 0 0
Impairment Reversals (Note 10) 0  
Exchange Rate Movements and Other (2) 0
Divestitures 0  
Transfers to Assets Held for Sale (Note 16) (24)  
Ending Balance $ (1,139) $ (1,037)