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Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2021
CAD ($)
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance $ 25,411
Ending Balance 37,599
COST  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance 37,046
Acquisitions 13,745
Additions 1,698
Change in Decommissioning Liabilities 17
Exchange Rate Movements and Other (72)
Divestitures 265
Ending Balance 52,169
ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance (11,635)
Depreciation, Depletion and Amortization 2,993
Exchange Rate Movements and Other 22
Divestitures (36)
Ending Balance (14,570)
Processing, Transportation and Storage Assets  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance 176
Ending Balance 179
Processing, Transportation and Storage Assets | COST  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance 218
Acquisitions 0
Additions 10
Change in Decommissioning Liabilities 0
Exchange Rate Movements and Other 0
Divestitures 0
Ending Balance 228
Processing, Transportation and Storage Assets | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance (42)
Depreciation, Depletion and Amortization 7
Exchange Rate Movements and Other 0
Divestitures 0
Ending Balance (49)
Manufacturing Assets  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance 3,476
Ending Balance 8,239
Manufacturing Assets | COST  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance 5,671
Acquisitions 4,423
Additions 756
Change in Decommissioning Liabilities 11
Exchange Rate Movements and Other (58)
Divestitures 0
Ending Balance 10,803
Manufacturing Assets | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance (2,195)
Depreciation, Depletion and Amortization 389
Exchange Rate Movements and Other 20
Divestitures 0
Ending Balance (2,564)
Retail and other  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance 253
Ending Balance 806
Retail and other | COST  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance 1,290
Acquisitions 577
Additions 80
Change in Decommissioning Liabilities 1
Exchange Rate Movements and Other (17)
Divestitures 0
Ending Balance 1,931
Retail and other | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance (1,037)
Depreciation, Depletion and Amortization 89
Exchange Rate Movements and Other 1
Divestitures 0
Ending Balance (1,125)
Oil and Gas Properties  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance 21,506
Ending Balance 28,375
Oil and Gas Properties | COST  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance 29,867
Acquisitions 8,745
Additions 852
Change in Decommissioning Liabilities 5
Exchange Rate Movements and Other 3
Divestitures 265
Ending Balance 39,207
Oil and Gas Properties | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION  
Disclosure of detailed information about property, plant and equipment [line items]  
Beginning Balance (8,361)
Depreciation, Depletion and Amortization 2,508
Exchange Rate Movements and Other 1
Divestitures (36)
Ending Balance $ (10,832)