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Long-Term Debt - Schedule of Debt Repayments (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings $ 11,445 $ 14,694
Gross carrying amount    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings 11,514 $ 14,781
Gross carrying amount | 2023    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings 404  
Gross carrying amount | 2024    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings 1,009  
Gross carrying amount | 2025    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings 1,624  
Gross carrying amount | 2026    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings 441  
Gross carrying amount | 2027    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings 1,692  
Gross carrying amount | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Borrowings $ 6,344