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Risk Management - Undiscounted Cash Outflows Relating to Financial Liabilities (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts payable and accrued liabilities [member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | $ 2,018 | $ 2,229
Accounts payable and accrued liabilities [member] | Less Than 1 Year [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 2,018 | 2,229
Short-term Borrowings [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 121 |
Short-term Borrowings [Member] | Less Than 1 Year [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 121 |
Long-term Borrowings [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 12,943 | 12,473
Long-term Borrowings [Member] | Less Than 1 Year [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 385 | 344
Long-term Borrowings [Member] | Years 2 and 3 [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 1,965 | 1,338
Long-term Borrowings [Member] | Years 4 and 5 [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 1,966 | 1,465
Long-term Borrowings [Member] | Thereafter [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 8,627 | 9,326
Contingent Payment ([Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 64 | 148
Contingent Payment ([Member] | Less Than 1 Year [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 36 | 79
Contingent Payment ([Member] | Years 2 and 3 [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 28 | 69
Lease liabilities [member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 2,476 | 2,697
Lease liabilities [member] | Less Than 1 Year [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 254 | 277
Lease liabilities [member] | Years 2 and 3 [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 445 | 466
Lease liabilities [member] | Years 4 and 5 [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | 365 | 410
Lease liabilities [member] | Thereafter [Member] |  |
Disclosure of Maturity Analysis for Financial Liabilities [Line Items] |  |
Financial instruments | $ 1,412 | $ 1,544

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- Definition The amount of contractual undiscounted cash flows in relation to non-derivative financial liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 39 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_39_a&doctype=Standard -URIDate 2020-01-01 + Details
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