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Commitments and Contingencies - Narrative (Details)
$ in Millions
May 17, 2021
$ / bbl
May 17, 2017
$ / bbl
Sep. 30, 2021
CAD ($)
Jan. 01, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Total Payments     $ 33,343    
Transportation and Storage     29,386    
Outstanding letters of credit     507   $ 441
Contingent liabilities recognised in business combination     392   63
Commitments approved and not yet in service          
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Transportation and Storage     8,100   14,000
Arrangement          
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Total Payments       $ 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  
Keystone XL Pipeline          
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Transportation and Storage         7,000
HMLP          
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Total Payments         $ 2,700
Conoco Phillips Company and certain of its subsidiaries          
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Average crude oil price | $ / bbl 52.00        
Contingent liabilities recognised in business combination     $ 392    
Conoco Phillips Company and certain of its subsidiaries | Top of range          
Disclosure Of Commitments And Contingent Liabilities [Line Items]          
Average crude oil price | $ / bbl   52.00