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Supplementary Cash Flow Information - Summary of Reconciliation of Cash Flows from Financing Activities (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items] |  |  |
Lease Liabilities, Beginning of Year | $ 1,916 | $ 1,494 |
Changes From Financing Cash Flows: |  |  |
Repayment of Long-Term Debt | (112) | (2,279) | $ (1,144)
Principal Repayment of Leases | (197) | (150) |
Issuance of Long-Term Debt | 1,326 |  |
Non-Cash Changes: |  |  |
Additions | 49 | 590 |
Lease Terminations | 1 | 11 |
Lease Modifications | (2) |  |
Other |  |  | (1)
Lease Liabilities, End of Year | 1,757 | 1,916 | 1,494
Ending balance | 121 |  |
Dividends Payable [Member] |  |  |
Changes From Financing Cash Flows: |  |  |
Dividends Paid | (77) | (260) | (245)
Non-Cash Changes: |  |  |
Dividends Declared | 77 | 260 | 245
Short-Term Borrowings [Member] |  |  |
Changes From Financing Cash Flows: |  |  |
Issuance (Repayment) of Short-Term Borrowings | 117 |  |
Non-Cash Changes: |  |  |
Foreign Exchange (Gain) Loss | 4 |  |
Ending balance | 121 |  |
Long-term Borrowings [Member] |  |  |
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items] |  |  |
Beginning balance | 6,699 | 9,164 | 9,513
Changes From Financing Cash Flows: |  |  |
Repayment of Long-Term Debt | (112) | (2,279) | (1,144)
Net Issuance (Repayment) of Revolving Long-Term Debt | (220) | 276 | (20)
Issuance of Long-Term Debt | 1,326 |  |
Non-Cash Changes: |  |  |
Foreign Exchange (Gain) Loss | (231) | (399) | 817
Finance Costs |  |  | (2)
Gain on Repurchase of Debt and Amortization of Debt Issuance Costs | (20) | (63) |
Other | (1) |  |
Ending balance | 7,441 | 6,699 | $ 9,164
Lease liabilities [member] |  |  |
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items] |  |  |
Lease Liabilities, Beginning of Year | 1,916 |  |
Changes From Financing Cash Flows: |  |  |
Principal Repayment of Leases | (197) | (150) |
Non-Cash Changes: |  |  |
Foreign Exchange (Gain) Loss | (6) | (23) |
Additions | 49 | 590 |
Re-measurement of Lease Liabilities | (2) | 15 |
Lease Terminations | (1) | (11) |
Lease Modifications | (2) |  |
Other |  | 1 |
Lease Liabilities, End of Year | 1,757 | 1,916 |
Lease liabilities [member] | IFRS 16 [Member] | Adjustments [Member] |  |  |
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Line Items] |  |  |
Lease Liabilities, Beginning of Year | $ 1,494 |  |
Non-Cash Changes: |  |  |
Lease Liabilities, End of Year |  | $ 1,494 |

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