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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | $ 2,602 | $ 2,504
Disposals |  | (55)
Recognized in Income Statement | 280 | (454)
Recognized in Other Comprehensive Income | (87) | (366)
Recognized in Equity | 25 | 6
Translation and Other | (32) | 59
Ending balance | 2,228 | 2,602
Loss carryforwards [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 705 | 1,019
Disposals |  | (18)
Recognized in Income Statement | (210) | (278)
Recognized in Equity |  | (1)
Translation and Other | 2 | (17)
Ending balance | 497 | 705
Actuarial liabilities [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 8,443 | 5,466
Recognized in Income Statement | 1,063 | 3,093
Recognized in Equity |  | (1)
Translation and Other | (134) | (115)
Ending balance | 9,372 | 8,443
Pensions and post-employment benefits [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 226 | 242
Recognized in Income Statement |  | 4
Recognized in Other Comprehensive Income | (10) | (20)
Translation and Other | (1) |
Ending balance | 215 | 226
Tax credits [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 0 | 261
Recognized in Income Statement |  | (253)
Translation and Other |  | (8)
Ending balance |  | 0
Accrued interest [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 1 | 1
Recognized in Income Statement |  | 0
Ending balance | 1 | 1
Real estate [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (1,046) | (959)
Recognized in Income Statement | 5 | (110)
Recognized in Other Comprehensive Income | (2) |
Recognized in Equity | 1 |
Translation and Other | 9 | 23
Ending balance | (1,033) | (1,046)
Securities and other investments [member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (4,704) | (2,689)
Recognized in Income Statement | (1,254) | (1,863)
Recognized in Other Comprehensive Income | (59) | (347)
Recognized in Equity | 2 | 39
Translation and Other | 72 | 156
Ending balance | (5,943) | (4,704)
Sale of investments [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (69) | (87)
Recognized in Income Statement | 13 | 17
Translation and Other |  | 1
Ending balance | (56) | (69)
Goodwill and intangible assets [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (876) | (847)
Recognized in Income Statement | 24 | (49)
Translation and Other | 3 | 20
Ending balance | (849) | (876)
Other [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (78) | 97
Disposals |  | (37)
Recognized in Income Statement | 79 | (107)
Recognized in Other Comprehensive Income | (16) | 1
Recognized in Equity | 22 | (31)
Translation and Other | 17 | (1)
Ending balance | $ 24 | $ (78)

X
- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of deferred tax related to items credited (charged) directly to equity. [Refer: Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81&doctype=Standard -URIDate 2020-01-01 + Details
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