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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | 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 |  |
Changes From Financing Cash Flows: |  |  |  |  |
(Repayment) of Long-Term Debt | $ (1,346) | $ (2,889) | (1,346) | $ (4,149) |
Principal Repayment of Leases | (70) | (78) | (216) | (228) |
Payment for Purchase of Warrants | (600) | 0 | (600) | 0 |
Non-Cash Changes: |  |  |  |  |
Net Premium (Discount) on Redemption of Long-Term Debt | (84) | (4) | (84) | (29) |
Lease Additions |  |  | 45 |  |
Lease Modifications |  |  | 34 |  |
Lease Re-measurements |  |  | 8 |  |
Ending balance, short term borrowings | 14 |  | 14 |  | $ 115
Ending Balance, lease liabilities | 2,733 |  | 2,733 |  | 2,836
Dividends Payable |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Beginning balance. dividend payables |  |  | 9 | 0 | 0
Non-Cash Changes: |  |  |  |  |
Beginning balance. dividend payables | 9 | 0 | 9 | 0 | 9
Dividends Payable | Common shares |  |  |  |  |
Changes From Financing Cash Flows: |  |  |  |  |
Dividends Paid |  |  | (729) | (481) |
Non-Cash Changes: |  |  |  |  |
Dividends declared |  |  | 729 | 481 |
Dividends Payable | Preference shares |  |  |  |  |
Changes From Financing Cash Flows: |  |  |  |  |
Dividends Paid |  |  | (27) | (26) |
Non-Cash Changes: |  |  |  |  |
Dividends declared |  |  | 27 | 26 |
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 Costs |  |  | 2 |  |
Purchased and Cancelled |  |  | 711 |  |
Ending balance, warrant payable | 111 | 0 | 111 | 0 | 0
Short-Term Borrowings |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Beginning balance, short-term borrowings |  |  | 115 | 79 | 79
Changes From Financing Cash Flows: |  |  |  |  |
Net Issuance Repayment Of Short Term Borrowings |  |  | (101) | (81) |
Non-Cash Changes: |  |  |  |  |
Lease Acquisitions |  |  | 0 |  |
Exchange Rate Movements and Other |  |  | 0 | 2 |
Ending balance, short term borrowings | 14 | 0 | 14 | 0 | 115
Long-Term Debt |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Beginning balance, long-term debt |  |  | 8,691 | 12,385 | 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 Costs |  |  | (15) | (24) |
Lease Acquisitions |  |  | 0 |  |
Exchange Rate Movements and Other |  |  | (22) | 591 |
Ending balance, long-term debt | 7,224 | 8,774 | 7,224 | 8,774 | 8,691
Lease Liabilities |  |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |  |
Beginning balance, lease liabilities |  |  | 2,836 | 2,957 | 2,957
Changes From Financing Cash Flows: |  |  |  |  |
Principal Repayment of Leases |  |  | (216) | (228) |
Non-Cash Changes: |  |  |  |  |
Lease Acquisitions |  |  | 33 |  |
Lease Additions |  |  | 45 | 19 |
Lease Modifications |  |  | 34 | 46 |
Lease Re-measurements |  |  | (6) | 3 |
Lease Divestitures |  |  | (11) |  |
Lease Re-measurements |  |  | (8) | (2) |
Exchange Rate Movements and Other |  |  | 26 | 74 |
Ending Balance, lease liabilities | $ 2,733 | $ 2,869 | $ 2,733 | $ 2,869 | $ 2,836

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