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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
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance, short-term borrowings |  |  | $ 121 |
Beginning balance, lease liabilities |  |  | 1,757 |
Changes From Financing Cash Flows: |  |  |  |
Issuance of Long-Term Debt | $ 1,557 | $ 1,326 | 1,557 | $ 1,326
(Repayment) of Long-Term Debt | (2,336) | 0 | (2,336) | (112)
(Repayment) of Revolving Long-Term Debt | 0 | (1,444) | (350) | (220)
Principal Repayment of Leases | (70) | (45) | (222) | (149)
Non-Cash Changes: |  |  |  |
Lease Additions |  |  | (101) |
Lease Modifications |  |  | (6) |
Other | (2) | 0 | (2) | 0
Ending Balance, lease liabilities | 3,075 |  | 3,075 |
Ending balance, short term borrowings | 48 |  | 48 |
Dividends Payable | Common shares |  |  |  |
Changes From Financing Cash Flows: |  |  |  |
Dividends Paid |  |  | (106) | (77)
Non-Cash Changes: |  |  |  |
Common Share Dividends Declared |  |  | 106 | 77
Dividends Payable | Preferred Shares |  |  |  |
Changes From Financing Cash Flows: |  |  |  |
Dividends Paid |  |  | (26) |
Non-Cash Changes: |  |  |  |
Common Share Dividends Declared |  |  | 26 |
Short-Term Borrowings |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance, short-term borrowings |  |  | 121 | 0
Changes From Financing Cash Flows: |  |  |  |
Net Issuance (Repayment) of Short-Term Borrowings |  |  | (108) | 133
Acquisition (see Note 4A) |  |  | 40 |
Non-Cash Changes: |  |  |  |
Foreign Exchange (Gain) Loss, Net |  |  | (5) | 4
Ending balance, short term borrowings | 48 | 137 | 48 | 137
Long-Term Debt |  |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |  |
Beginning balance, long-term debt |  |  | 7,441 | 6,699
Changes From Financing Cash Flows: |  |  |  |
Net Issuance (Repayment) of Short-Term Borrowings |  |  | (350) |
Issuance of Long-Term Debt |  |  | 1,557 | 1,326
(Repayment) of Long-Term Debt |  |  | (2,336) | (112)
(Repayment) of Revolving Long-Term Debt |  |  |  | (220)
Acquisition (see Note 4A) |  |  | 6,602 |
Non-Cash Changes: |  |  |  |
Foreign Exchange (Gain) Loss, Net |  |  | 6 | 127
Net Premium (Discount) on Redemption of Long- Term Debt |  |  | 115 |
Finance Costs |  |  | (49) |
Net Premium (Discount) on Redemption of Long- Term Debt |  |  |  | (25)
Other |  |  |  | (1)
Ending balance, long-term debt | 12,986 | 7,797 | 12,986 | 7,797
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 |  |  | (222) | (149)
Acquisition (see Note 4A) |  |  | 1,441 |
Non-Cash Changes: |  |  |  |
Foreign Exchange (Gain) Loss, Net |  |  | (3) | 17
Lease Additions |  |  | 101 | 48
Lease Terminations |  |  |  | (1)
Lease Modifications |  |  | 6 | (3)
Lease Re-Measurements |  |  | (5) | 5
Ending Balance, lease liabilities | $ 3,075 | $ 1,833 | $ 3,075 | $ 1,833

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