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Supplementary Cash Flow Information - Summary of Reconciliation of Liabilities to Cash Flows from Financing Activities (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance, short-term borrowings |  |  | $ 173 |
Beginning balance, lease liabilities |  |  | 2,927 |
Acquisition | $ (7) | $ (4) | (236) | $ (19)
Changes From Financing Cash Flows: |  |  |  |
Principal Repayment of Leases | (89) | (74) | (266) | (219)
Repayment of Long-Term Debt | (183) | 0 | (195) | 0
Non-Cash Changes: |  |  |  |
Lease Additions |  |  | 162 |
Ending balance, short term borrowings | 0 |  | 0 |
Ending balance, lease liabilities | 2,872 |  | 2,872 |
Dividends Payable |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance. dividend payables |  |  | 0 | 9
Changes From Financing Cash Flows: |  |  |  |
Dividends Paid |  |  | (1,057) | (1,203)
Non-Cash Changes: |  |  |  |
Ending balance. dividend payables | 2 | 9 | 2 | 9
Dividends Payable | Common shares |  |  |  |
Non-Cash Changes: |  |  |  |
Dividends declared |  |  | 1,047 | 925
Variable Dividends Declared on Common Shares |  |  |  | 251
Dividends Payable | Preferred Shares |  |  |  |
Non-Cash Changes: |  |  |  |
Dividends declared |  |  | 12 | 27
Repurchase Agreements Payable |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance, Repurchase agreements payable |  |  | 0 | 0
Changes From Financing Cash Flows: |  |  |  |
Proceeds on Repurchase Agreements |  |  | 403 |
Repayment of Repurchase Agreements |  |  | (220) |
Non-Cash Changes: |  |  |  |
Exchange Rate Movements and Other |  |  | (7) |
Ending balance, Repurchase agreements payable | 176 | 0 | 176 | 0
Short-Term Borrowings |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance, short-term borrowings |  |  | 173 | 179
Changes From Financing Cash Flows: |  |  |  |
Net Issuance (Repayment) of Short-Term Borrowings |  |  | 152 | (74)
Non-Cash Changes: |  |  |  |
Divestiture of Short-Term Borrowings |  |  | 313 |
Exchange Rate Movements and Other |  |  | (12) | (4)
Ending balance, short term borrowings | 0 | 101 | 0 | 101
Long-Term Debt |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance, long-term debt |  |  | 7,534 | 7,108
Acquisition |  |  | 12 |
Changes From Financing Cash Flows: |  |  |  |
Repayment of Long-Term Debt |  |  | (195) |
Non-Cash Changes: |  |  |  |
Finance and Transaction Costs |  |  | (15) | (13)
Exchange Rate Movements and Other |  |  | (180) | 104
Ending balance, long-term debt | 7,156 | 7,199 | 7,156 | 7,199
Lease Liabilities |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance, lease liabilities |  |  | 2,927 | 2,658
Changes From Financing Cash Flows: |  |  |  |
Principal Repayment of Leases |  |  | (266) | (219)
Non-Cash Changes: |  |  |  |
Lease Additions |  |  | 162 | 104
Lease Divestitures |  |  | (39) |
Exchange Rate Movements and Other |  |  | 88 | 97
Ending balance, lease liabilities | $ 2,872 | $ 2,640 | $ 2,872 | $ 2,640

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