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Right of Use Assets, Net - Summary of Right of Use Assets, Net (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance $ 1,325 $ 893
Depreciation 215  
Ending balance 1,139 1,325
Cost [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 1,492 894
Additions 53 624
Terminations (1) (11)
Modifications (2)  
Reclassifications (14) (8)
Re-measurement (2) 14
Exchange Rate Movements and Other (24) (21)
Ending balance 1,502 1,492
Accumulated Depreciation [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 167 1
Depreciation   165
Impairment Losses 3 3
Terminations (1) (1)
Exchange Rate Movements and Other (21) (1)
Ending balance 363 167
Real estate [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 477 517
Depreciation 27  
Ending balance 437 477
Real estate [Member] | Cost [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 509 517
Additions 1 10
Reclassifications (14) (8)
Exchange Rate Movements and Other (1) (10)
Ending balance 495 509
Real estate [Member] | Accumulated Depreciation [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 32  
Depreciation   29
Impairment Losses   3
Exchange Rate Movements and Other (1)  
Ending balance 58 32
Railcars & Barges [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 440 63
Depreciation 86  
Ending balance 349 440
Railcars & Barges [Member] | Cost [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 495 63
Additions 18 436
Re-measurement (20) (2)
Exchange Rate Movements and Other (13) (2)
Ending balance 480 495
Railcars & Barges [Member] | Accumulated Depreciation [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 55  
Depreciation   55
Impairment Losses 3  
Exchange Rate Movements and Other (13)  
Ending balance 131 55
Storage Assets [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 391 292
Depreciation 95  
Ending balance 335 391
Storage Assets [Member] | Cost [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 464 292
Additions 22 172
Terminations (1) (11)
Modifications 1  
Re-measurement 19 18
Exchange Rate Movements and Other (8) (7)
Ending balance 497 464
Storage Assets [Member] | Accumulated Depreciation [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 73  
Depreciation   75
Terminations (1) (1)
Exchange Rate Movements and Other (5) (1)
Ending balance 162 73
Refining Equipment [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 7 12
Depreciation 2  
Ending balance 10 7
Refining Equipment [Member] | Cost [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 10 13
Additions 5  
Re-measurement   (2)
Exchange Rate Movements and Other   (1)
Ending balance 15 10
Refining Equipment [Member] | Accumulated Depreciation [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 3 1
Depreciation   2
Ending balance 5 3
Other assets [member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 10 9
Depreciation 5  
Ending balance 8 10
Other assets [member] | Cost [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 14 9
Additions 7 6
Modifications (3)  
Re-measurement (1)  
Exchange Rate Movements and Other (2) (1)
Ending balance 15 14
Other assets [member] | Accumulated Depreciation [Member]    
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items]    
Beginning balance 4  
Depreciation   4
Exchange Rate Movements and Other (2)  
Ending balance $ 7 $ 4