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Supplementary Cash Flow Information - Summary of Reconciliation of Liabilities to Cash Flows from Financing Activities (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | 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 |  |
Changes From Financing Cash Flows: |  |  |  |  |
Repayment of Long-Term Debt | $ 0 | $ (1,346) | 0 | $ (1,346) |
Principal Repayment of Leases | (74) | (70) | (219) | (216) |
Variable Dividends Paid on Common Shares |  |  | (251) |  |
Payment for Purchase of Warrants | 0 | (600) | 0 | (600) |
Non-Cash Changes: |  |  |  |  |
Net Premium (Discount) on Redemption of Long-Term Debt | 0 | (84) | 0 | (84) |
Lease Additions |  |  | 104 |  |
Variable Dividends Declared on Common Shares |  |  | 251 |  |
Ending balance, short term borrowings | 101 |  | 101 |  | $ 179
Ending Balance, lease liabilities | 2,640 |  | 2,640 |  | 2,658
Dividends Payable |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Beginning balance. dividend payables |  |  | 9 | 9 | 9
Non-Cash Changes: |  |  |  |  |
Ending balance. dividend payables | 9 | 9 | 9 | 9 | 9
Dividends Payable | Common shares |  |  |  |  |
Changes From Financing Cash Flows: |  |  |  |  |
Dividends Paid |  |  | (925) | (729) |
Non-Cash Changes: |  |  |  |  |
Dividends declared |  |  | 925 | 729 |
Dividends Payable | Preferred Shares |  |  |  |  |
Changes From Financing Cash Flows: |  |  |  |  |
Dividends Paid |  |  | (27) | (27) |
Non-Cash Changes: |  |  |  |  |
Dividends declared |  |  | 27 | 27 |
Warrant Purchase Payable |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Beginning balance, warrant payable |  |  | 0 | 0 | 0
Changes From Financing Cash Flows: |  |  |  |  |
Payment for Purchase of Warrants |  |  |  | (600) |
Finance and Transaction Costs |  |  |  | (2) |
Non-Cash Changes: |  |  |  |  |
Finance and Transaction Costs |  |  | 0 | 2 |
Purchased and Cancelled |  |  |  | 711 |
Ending balance, warrant payable | 0 | 111 | 0 | 111 | 0
Short-Term Borrowings |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Beginning balance, short-term borrowings |  |  | 179 | 115 | 115
Changes From Financing Cash Flows: |  |  |  |  |
Net Issuance (Repayment) of Short-Term Borrowings |  |  | (74) | (101) |
Non-Cash Changes: |  |  |  |  |
Exchange Rate Movements and Other |  |  | (4) | 0 |
Ending balance, short term borrowings | 101 | 14 | 101 | 14 | 179
Long-Term Debt |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Beginning balance, long-term debt |  |  | 7,108 | 8,691 | 8,691
Changes From Financing Cash Flows: |  |  |  |  |
Repayment of Long-Term Debt |  |  |  | (1,346) |
Non-Cash Changes: |  |  |  |  |
Net Premium (Discount) on Redemption of Long-Term Debt |  |  |  | (84) |
Finance and Transaction Costs |  |  | (13) | (15) |
Exchange Rate Movements and Other |  |  | 104 | (22) |
Ending balance, long-term debt | 7,199 | 7,224 | 7,199 | 7,224 | 7,108
Lease Liabilities |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Beginning balance, lease liabilities |  |  | 2,658 | 2,836 | 2,836
Changes From Financing Cash Flows: |  |  |  |  |
Principal Repayment of Leases |  |  | (219) | (216) |
Non-Cash Changes: |  |  |  |  |
Lease Acquisitions |  |  |  | 33 |
Lease Additions |  |  | 104 | 45 |
Exchange Rate Movements and Other |  |  | 97 | 35 |
Ending Balance, lease liabilities | $ 2,640 | $ 2,733 | $ 2,640 | $ 2,733 | $ 2,658

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