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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance, short-term borrowings |  |  | $ 79 |
Beginning balance, lease liabilities |  |  | 2,957 |
Changes From Financing Cash Flows: |  |  |  |
(Repayment) of Long-Term Debt | $ (750) | $ 0 | (1,260) | $ 0
Payments of lease liabilities | (75) | (77) | (150) | (152)
Non-Cash Changes: |  |  |  |
Net premium (discount) on redemption of long-term debt |  | 0 | (25) | 0
Lease Additions |  |  | (3) |
Lease Modifications |  |  | (42) |
Lease Terminations |  |  | (1) |
Ending balance, short term borrowings | 0 |  | 0 |
Ending Balance, lease liabilities | 2,866 |  | 2,866 |
Dividends Payable | Common shares |  |  |  |
Changes From Financing Cash Flows: |  |  |  |
Dividends Paid |  |  | (276) | (71)
Non-Cash Changes: |  |  |  |
Increase (Decrease) Through Dividends Declared Liabilities Arising From Financing Activities |  |  | 276 | 71
Dividends Payable | Preference shares |  |  |  |
Changes From Financing Cash Flows: |  |  |  |
Dividends Paid |  |  | (17) | (17)
Non-Cash Changes: |  |  |  |
Increase (Decrease) Through Dividends Declared Liabilities Arising From Financing Activities |  |  | 17 | 17
Short-Term Borrowings |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance, short-term borrowings |  |  | 79 | 121
Acquisition |  |  |  | (40)
Changes From Financing Cash Flows: |  |  |  |
Net Issuance Repayment Of Short Term Borrowings |  |  | (79) | (89)
Non-Cash Changes: |  |  |  |
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities |  |  |  | (7)
Ending balance, short term borrowings | 0 | 65 | 0 | 65
Long-Term Debt |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance, long-term debt |  |  | 12,385 | 7,441
Acquisition |  |  |  | (6,602)
Changes From Financing Cash Flows: |  |  |  |
(Repayment) of Long-Term Debt |  |  | (1,260) | (350)
Non-Cash Changes: |  |  |  |
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities |  |  | 146 | (280)
Net premium (discount) on redemption of long-term debt |  |  | (25) |
Finance Costs |  |  | (18) | (33)
Ending balance, long-term debt | 11,228 | 13,380 | 11,228 | 13,380
Lease Liabilities |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance, lease liabilities |  |  | 2,957 | 1,757
Acquisition |  |  |  | (1,441)
Changes From Financing Cash Flows: |  |  |  |
Payments of lease liabilities |  |  | (150) | (152)
Non-Cash Changes: |  |  |  |
Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities |  |  | 12 | (20)
Lease Additions |  |  | 3 | 58
Lease Modifications |  |  | 42 | 6
Re Measurement Of Lease Liabilities |  |  | 3 | (3)
Lease Terminations |  |  | 1 |
Ending Balance, lease liabilities | $ 2,866 | $ 3,087 | $ 2,866 | $ 3,087

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