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Property, Plant and Equipment, Net - Summary of Property, Plant and Equipment (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Aug. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance $ 34,225 $ 25,411  
Ending Balance 36,499 34,225  
Property, Plant and Equipment, Net 36,499 34,225  
Offshore      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 2,822    
Ending Balance 2,549 2,822  
Property, Plant and Equipment, Net 2,549 2,822  
Write-downs (reversals of write-downs) of property, plant and equipment 26    
Canadian Manufacturing      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 2,558    
Ending Balance 2,466 2,558  
Property, Plant and Equipment, Net 2,466 2,558  
Write-downs (reversals of write-downs) of property, plant and equipment 25    
Sunrise Oil Sands Partnership      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, Plant and Equipment, Net     $ 454
COST      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 50,901 37,046  
Acquisitions (Note 5) 3,230 13,380  
Additions 3,671 2,515  
Change in Decommissioning Liabilities (253) 2  
Divestitures (Note 5) (2) (557) (630)  
Transfers to Assets Held for Sale (Note 18)   (1,276)  
Exchange Rate Movements and Other 747 (136)  
Ending Balance 57,739 50,901  
Property, Plant and Equipment, Net 57,739 50,901  
ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance (16,676) (11,635)  
Divestitures (Note 5) (2) 84 377  
Transfers to Assets Held for Sale (Note 18)   (114)  
Exchange Rate Movements and Other 315 (20)  
Depreciation, Depletion and Amortization (3) 4,067 3,999  
Impairment Charges (Note 11) 1,499 1,931  
Impairment Reversals (Note 11) (1,233) (378)  
Ending Balance (21,240) (16,676)  
Property, Plant and Equipment, Net (21,240) (16,676)  
Oil and Gas Properties      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 27,531 21,506  
Ending Balance 29,226 27,531  
Property, Plant and Equipment, Net 29,226 27,531  
Oil and Gas Properties | COST      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 38,443 29,867  
Acquisitions (Note 5) 3,230 8,633  
Additions 2,409 1,368  
Change in Decommissioning Liabilities (186) (63)  
Divestitures (Note 5) (2) (557) (630)  
Transfers to Assets Held for Sale (Note 18)   (754)  
Exchange Rate Movements and Other 189 22  
Ending Balance 43,528 38,443  
Property, Plant and Equipment, Net 43,528 38,443  
Oil and Gas Properties | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance (10,912) (8,361)  
Divestitures (Note 5) (2) 84 377  
Transfers to Assets Held for Sale (Note 18)   (90)  
Exchange Rate Movements and Other 13 61  
Depreciation, Depletion and Amortization (3) 3,461 3,335  
Impairment Charges (Note 11) 0 0  
Impairment Reversals (Note 11) 0 (378)  
Ending Balance (14,302) (10,912)  
Property, Plant and Equipment, Net (14,302) (10,912)  
Processing, Transportation and Storage Assets      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 175 176  
Ending Balance 148 175  
Property, Plant and Equipment, Net 148 175  
Processing, Transportation and Storage Assets | COST      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 228 218  
Acquisitions (Note 5) 0 0  
Additions 11 9  
Change in Decommissioning Liabilities (6) 1  
Divestitures (Note 5) (2) 0 0  
Transfers to Assets Held for Sale (Note 18)   0  
Exchange Rate Movements and Other 21 0  
Ending Balance 254 228  
Property, Plant and Equipment, Net 254 228  
Processing, Transportation and Storage Assets | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance (53) (42)  
Divestitures (Note 5) (2) 0 0  
Transfers to Assets Held for Sale (Note 18)   0  
Exchange Rate Movements and Other 16 1  
Depreciation, Depletion and Amortization (3) 37 10  
Impairment Charges (Note 11) 0 0  
Impairment Reversals (Note 11) 0 0  
Ending Balance (106) (53)  
Property, Plant and Equipment, Net (106) (53)  
Manufacturing Assets      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 5,923 3,476  
Ending Balance 6,585 5,923  
Property, Plant and Equipment, Net 6,585 5,923  
Manufacturing Assets | COST      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 10,495 5,671  
Acquisitions (Note 5) 0 3,901  
Additions 1,143 1,023  
Change in Decommissioning Liabilities (29) 40  
Divestitures (Note 5) (2) 0 0  
Transfers to Assets Held for Sale (Note 18)   0  
Exchange Rate Movements and Other 523 (140)  
Ending Balance 12,132 10,495  
Property, Plant and Equipment, Net 12,132 10,495  
Manufacturing Assets | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance (4,572) (2,195)  
Divestitures (Note 5) (2) 0 0  
Transfers to Assets Held for Sale (Note 18)   0  
Exchange Rate Movements and Other 243 (80)  
Depreciation, Depletion and Amortization (3) 466 526  
Impairment Charges (Note 11) 1,499 1,931  
Impairment Reversals (Note 11) (1,233) 0  
Ending Balance (5,547) (4,572)  
Property, Plant and Equipment, Net (5,547) (4,572)  
Retail and other      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 596 253  
Ending Balance 540 596  
Property, Plant and Equipment, Net 540 596  
Retail and other | COST      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance 1,735 1,290  
Acquisitions (Note 5) 0 846  
Additions 108 115  
Change in Decommissioning Liabilities (32) 24  
Divestitures (Note 5) (2) 0 0  
Transfers to Assets Held for Sale (Note 18)   (522)  
Exchange Rate Movements and Other 14 (18)  
Ending Balance 1,825 1,735  
Property, Plant and Equipment, Net 1,825 1,735  
Retail and other | ACCUMULATED DEPRECIATION, DEPLETION AND AMORTIZATION      
Disclosure of detailed information about property, plant and equipment [line items]      
Beginning Balance (1,139) (1,037)  
Divestitures (Note 5) (2) 0 0  
Transfers to Assets Held for Sale (Note 18)   (24)  
Exchange Rate Movements and Other 43 (2)  
Depreciation, Depletion and Amortization (3) 103 128  
Impairment Charges (Note 11) 0 0  
Impairment Reversals (Note 11) 0 0  
Ending Balance (1,285) (1,139)  
Property, Plant and Equipment, Net $ (1,285) $ (1,139)