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Credit Facilities, Long-Term Debt and Lease Liabilities - Principal Repayments (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]    
Principal repayments $ 3,653 $ 3,267
2023    
Disclosure of detailed information about borrowings [line items]    
Lease incentive 12  
Cost    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 3,563  
Lease liabilities 135  
Cost | 2023    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 170  
Lease liabilities (7)  
Cost | 2024    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 527  
Lease liabilities 4  
Cost | 2025    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 142  
Lease liabilities 4  
Cost | 2026    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 177  
Lease liabilities 3  
Cost | 2027    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 154  
Lease liabilities 4  
Cost | 2028    
Disclosure of detailed information about borrowings [line items]    
Principal repayments 2,393  
Lease liabilities $ 127