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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, 2024
Dec. 31, 2023
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance, short-term borrowings $ 179  
Beginning balance, lease liabilities 2,658 $ 2,836
Disclosure of reconciliation of liabilities arising from financing activities [abstract]    
Repayment of Long-Term Debt 0 (1,346)
Principal Repayment of Leases (299) (288)
Variable Dividends Declared on Common Shares 251 0
Payment for Purchase of Warrants 0 (711)
Non-Cash Changes:    
Lease Additions 363 57
Warrants Purchased and Cancelled 87  
Ending balance, short term borrowings 173 179
Ending balance, lease liabilities 2,927 2,658
Common Shares    
Disclosure of reconciliation of liabilities arising from financing activities [abstract]    
Variable Dividends Declared on Common Shares 251  
Preferred Shares    
Non-Cash Changes:    
Warrants Purchased and Cancelled 163 0
Dividends Payable    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance, dividend payable 9 9
Disclosure of reconciliation of liabilities arising from financing activities [abstract]    
Dividends Paid (1,551) (1,026)
Non-Cash Changes:    
Ending balance, dividend payable 0 9
Dividends Payable | Common Shares    
Non-Cash Changes:    
Dividends declared 1,255 990
Variable Dividends Declared on Common Shares 251  
Dividends Payable | Preferred Shares    
Non-Cash Changes:    
Dividends declared 36 36
Warrants    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance, warrant payable 0 0
Disclosure of reconciliation of liabilities arising from financing activities [abstract]    
Payment for Purchase of Warrants   (711)
Finance and Transaction Costs   (2)
Non-Cash Changes:    
Finance and Transaction Costs 0 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 179 115
Disclosure of reconciliation of liabilities arising from financing activities [abstract]    
Net Issuance (Repayment) of Short-Term Borrowings 5 58
Non-Cash Changes:    
Exchange Rate Movements and Other (11) 6
Ending balance, short term borrowings 173 179
Long-Term Debt    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance, long term debt 7,108 8,691
Disclosure of reconciliation of liabilities arising from financing activities [abstract]    
Repayment of Long-Term Debt   (1,346)
Non-Cash Changes:    
Net Premium (Discount) on Redemption of Long-Term Debt   (84)
Finance and Transaction Costs (16) (19)
Exchange Rate Movements and Other 442 (134)
Ending balance, long term debt 7,534 7,108
Lease Liabilities    
Disclosure of reconciliation of liabilities arising from financing activities [line items]    
Beginning balance, lease liabilities 2,658 2,836
Disclosure of reconciliation of liabilities arising from financing activities [abstract]    
Principal Repayment of Leases (299) (288)
Non-Cash Changes:    
Lease Acquisitions   33
Lease Additions 363 57
Exchange Rate Movements and Other 205 20
Ending balance, lease liabilities $ 2,927 $ 2,658