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Income Taxes - Reconciliation of Income Taxes Calculated at Statutory Rate (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation Of Average Effective Tax Rate And Applicable Tax Rate [Abstract] |  |  |
Earnings (Loss) From Continuing Operations Before Income Tax | $ (3,230) | $ 1,397 | $ (3,926)
Canadian Statutory Rate | 24.00% | 26.50% | 27.00%
Expected Income Tax Expense (Recovery) From Continuing Operations | $ (775) | $ 370 | $ (1,060)
Effect on Taxes Resulting From: |  |  |
Statutory and Other Rate Differences | 19 | (52) | (57)
Non-Taxable Capital (Gains) Losses | (42) | (38) | 89
Non-Recognition of Capital (Gains) Losses | (42) | (39) | 87
Adjustments Arising From Prior Year Tax Filings | (8) | 4 | 3
Recognition of U.S. Tax Basis |  | (387) | (78)
Alberta Corporate Rate Reduction | (7) | (671) |
Other | 4 | 16 | 6
Tax Expense (Recovery) From Continuing Operations | $ (851) | $ (797) | $ (1,010)
Effective Tax Rate | 26.30% | (57.10%) | 25.70%

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- Definition The amount of profit (loss) for a period before deducting tax expense. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2020-01-01 + Details
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