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Supplementary Cash Flow Information - Summary of Reconciliation of Liabilities to Cash Flows from Financing Activities (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance, lease liabilities | $ 1,757 | $ 1,916 |
Changes From Financing Cash Flows: |  |  |
Issuance of Long-Term Debt | 1,557 | 1,326 | $ 0
(Repayment) of Long-Term Debt | (2,870) | (112) | (2,279)
Principal Repayment of Leases | (300) | (197) | (150)
Non-Cash Changes: |  |  |
Lease Additions | 110 | 49 |
Lease Terminations | (1) | (1) |
Lease Modifications | 22 | (2) |
Transfers to Liabilities Related to Assets Held for Sale | (58) |  |
Other | (8) | 0 | 0
Ending Balance, lease liabilities | 2,957 | 1,757 | 1,916
Dividends Payable | Common shares |  |  |
Changes From Financing Cash Flows: |  |  |
Dividends Paid | (176) | (77) | (260)
Non-Cash Changes: |  |  |
Common Share Dividends Declared | 176 | 77 | 260
Dividends Payable | Preferred Shares |  |  |
Changes From Financing Cash Flows: |  |  |
Dividends Paid | (34) |  |
Non-Cash Changes: |  |  |
Common Share Dividends Declared | 34 |  |
Short-Term Borrowings |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance, debt | 121 | 0 |
Changes From Financing Cash Flows: |  |  |
Net Issuance (Repayment) of Short-Term Borrowings | (77) | 117 |
Acquisition (see Note 5A) | 40 |  |
Non-Cash Changes: |  |  |
Foreign Exchange (Gain) Loss, Net | (5) | 4 |
Ending balance, debt | 79 | 121 | 0
Long-Term Debt |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance, debt | 7,441 | 6,699 | 9,164
Changes From Financing Cash Flows: |  |  |
Issuance of Long-Term Debt | 1,557 | 1,326 | 276
(Repayment) of Long-Term Debt | (2,870) | (112) | (2,279)
Net Issuance (Repayment) of Revolving Long-Term Debt | (350) | (220) |
Acquisition (see Note 5A) | 6,602 |  |
Non-Cash Changes: |  |  |
Foreign Exchange (Gain) Loss, Net | (57) | (231) | (399)
Net Premium (Discount) on Redemption of Long-Term Debt | 121 |  | (63)
Net Premium (Discount) on Redemption of Long-Term Debt |  | (25) |
Finance Costs | (59) | 5 |
Other |  | (1) |
Ending balance, debt | 12,385 | 7,441 | 6,699
Lease Liabilities |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance, lease liabilities | 1,757 | 1,916 |
Changes From Financing Cash Flows: |  |  |
Principal Repayment of Leases | (300) | (197) | (150)
Acquisition (see Note 5A) | 1,441 |  |
Non-Cash Changes: |  |  |
Foreign Exchange (Gain) Loss, Net | (10) | (6) | (23)
Lease Additions | 110 | 49 | 590
Lease Terminations | (1) | (1) | (11)
Lease Modifications | 22 | (2) |
Lease Re-measurements | (4) | (2) | 15
Other |  |  | 1
Ending Balance, lease liabilities | $ 2,957 | $ 1,757 | 1,916
Lease Liabilities | I F R S16 | Adjustments |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance, lease liabilities |  |  | $ 1,494

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