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Commitments and Contingencies - Narrative (Details)
$ in Millions
 12 Months Ended
May 17, 2021
$ / bbl
Dec. 31, 2021
CAD ($)
$ / bbl
Jan. 01, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Contractual commitments   $ 34,846   $ 22,519  
Transportation and Storage   30,986   21,397  
Outstanding letters of credit   $ 565   441  
Average crude oil price | $ / bbl   45.00      
Contingent liabilities recognised in business combination   $ 236   63 $ 143
Keystone XL Pipeline          
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Transportation and Storage       $ 7,000  
Arrangement          
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Contractual commitments     $ 17,600    
Transportation and Storage     7,400    
Arrangement | Commitments approved and not yet in service          
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Transportation and Storage     $ 1,700    
HMLP          
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Contractual commitments   $ 2,600      
Conoco Phillips Company and certain of its subsidiaries          
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Average crude oil price | $ / bbl 52.00