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Commitments and Contingencies - Narrative (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Aug. 31, 2022
Jun. 13, 2022
Dec. 31, 2021
Disclosure Of Commitments And Contingent Liabilities [Line Items]        
Contractual commitments $ 32,998     $ 34,846
Outstanding letters of credit 490     565
HMLP        
Disclosure Of Commitments And Contingent Liabilities [Line Items]        
Contractual commitments 2,200     2,600
Sunrise Oil Sands Partnership        
Disclosure Of Commitments And Contingent Liabilities [Line Items]        
Contingent liabilities recognised in business combination $ 419     $ 0
Initial Recognition   $ 600 $ 600