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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | $ 2,485 | $ 2,228
Disposals |  | (9)
Recognized in Income Statement | (731) | 127
Recognized in Other Comprehensive Income | 863 | 61
Recognized in Equity | 8 | 15
Translation and Other | 24 | 63
Ending balance | 2,649 | 2,485
Loss carryforwards [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 517 | 497
Disposals |  | (10)
Recognized in Income Statement | 184 | 22
Translation and Other |  | 8
Ending balance | 701 | 517
Actuarial liabilities [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 8,703 | 9,372
Recognized in Income Statement | (5,537) | (666)
Recognized in Equity | 1 |
Translation and Other | 374 | (3)
Ending balance | 3,541 | 8,703
Pensions and post-employment benefits [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 161 | 215
Recognized in Income Statement | (1) | 7
Recognized in Other Comprehensive Income | (17) | (61)
Ending balance | 143 | 161
Tax credits [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 46 | 34
Recognized in Income Statement | 63 | 11
Recognized in Other Comprehensive Income |  | 1
Ending balance | 109 | 46
Accrued interest [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 1 | 1
Ending balance | 1 | 1
Real estate [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (1,171) | (1,033)
Recognized in Income Statement | (20) | (145)
Recognized in Other Comprehensive Income | (1) |
Translation and Other | (36) | 7
Ending balance | (1,228) | (1,171)
Securities and other investments [member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (5,139) | (5,950)
Recognized in Income Statement | 4,552 | 643
Recognized in Other Comprehensive Income | 879 | 119
Recognized in Equity | (1) |
Translation and Other | (250) | 49
Ending balance | 41 | (5,139)
Sale of investments [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (40) | (56)
Recognized in Income Statement | 10 | 16
Ending balance | (30) | (40)
Goodwill and intangible assets [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (804) | (849)
Recognized in Income Statement | (4) | 29
Translation and Other | (17) | 16
Ending balance | (825) | (804)
Other [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 211 | (3)
Disposals |  | 1
Recognized in Income Statement | 22 | 210
Recognized in Other Comprehensive Income | 2 | 2
Recognized in Equity | 8 | 15
Translation and Other | (47) | (14)
Ending balance | $ 196 | $ 211

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- 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 2022-03-24 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 81 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81&doctype=Standard -URIDate 2022-03-24 + Details
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