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Supplementary Cash Flow Information - Summary of Reconciliation of Liabilities to Cash Flows from Financing Activities (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance, short-term borrowings $ 115  
Beginning balance, lease liabilities 2,836 $ 2,957
Changes From Financing Cash Flows:    
Repayment of Long-Term Debt (1,346) (4,149)
Principal Repayment of Leases (288) (302)
Payment for Purchase of Warrants (711) 0
Non-Cash Changes:    
Lease Additions 57 25
Ending balance, short term borrowings 179 115
Ending balance, lease liabilities 2,658 2,836
Dividends Payable    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance, dividend payable 9 0
Non-Cash Changes:    
Ending balance, dividend payable 9 9
Dividends Payable | Common Shares    
Changes From Financing Cash Flows:    
Dividends paid (990) (682)
Variable Dividends Paid on Common Shares   (219)
Non-Cash Changes:    
Dividends declared 990 682
Variable Dividends Declared on Common Shares   219
Dividends Payable | Preference shares    
Changes From Financing Cash Flows:    
Dividends paid (36) (26)
Non-Cash Changes:    
Dividends declared 36 35
Warrant Purchase Payable    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance, warrant payable 0 0
Changes From Financing Cash Flows:    
Payment for Purchase of Warrants (711)  
Finance and Transaction Costs (2)  
Non-Cash Changes:    
Finance and Transaction Costs 2  
Warrants Purchased and Cancelled 711  
Ending balance, warrant payable 0 0
Short-Term Borrowings    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance, short-term borrowings 115 79
Changes From Financing Cash Flows:    
Net Issuance (Repayment) of Short-Term Borrowings 58 34
Non-Cash Changes:    
Exchange Rate Movements and Other 6 2
Ending balance, short term borrowings 179 115
Long-Term Debt    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance, long term debt 8,691 12,385
Changes From Financing Cash Flows:    
Repayment of Long-Term Debt (1,346) (4,149)
Non-Cash Changes:    
Net Premium (Discount) on Redemption of Long-Term Debt (84) (29)
Finance and Transaction Costs (19) (28)
Exchange Rate Movements and Other (134) 512
Ending balance, long term debt 7,108 8,691
Lease Liabilities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance, lease liabilities 2,836 2,957
Changes From Financing Cash Flows:    
Principal Repayment of Leases (288) (302)
Non-Cash Changes:    
Lease Acquisitions 33  
Lease Additions 57 25
Lease Divestitures (11)  
Exchange Rate Movements and Other 31 156
Ending balance, lease liabilities $ 2,658 $ 2,836