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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | $ 5,172 | $ 6,054
Recognized in Income Statement | (470) | 1,994
Recognized in Other Comprehensive Income | 326 | (3,034)
Recognized in Equity | 4 | 8
Translation and Other | 10 | 150
Ending balance | 5,042 | 5,172
Loss carryforwards [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 701 | 517
Recognized in Income Statement | (18) | 184
Recognized in Equity | (8) |
Translation and Other | (5) |
Ending balance | 670 | 701
Actuarial liabilities [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 4,507 | 13,731
Recognized in Income Statement | 188 | 2,334
Recognized in Other Comprehensive Income | 1,198 | (12,005)
Recognized in Equity |  | 11
Translation and Other | (80) | 436
Ending balance | 5,813 | 4,507
Pensions and post-employment benefits [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 142 | 161
Recognized in Income Statement | 4 | (2)
Recognized in Other Comprehensive Income | 26 | (17)
Translation and Other | (1) |
Ending balance | 171 | 142
Tax credits [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 109 | 46
Recognized in Income Statement | 15 | 63
Translation and Other | (2) |
Ending balance | 122 | 109
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 | (1,317) | (1,287)
Recognized in Income Statement | 168 | 10
Recognized in Other Comprehensive Income |  | (1)
Translation and Other | 14 | (39)
Ending balance | (1,135) | (1,317)
Lease liability [member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 47 | 26
Recognized in Income Statement | (7) | 17
Recognized in Equity |  | 3
Translation and Other | (2) | 1
Ending balance | 38 | 47
Right of use asset and sublease receivable [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (41) | (22)
Recognized in Income Statement | 7 | (18)
Recognized in Equity |  | (2)
Translation and Other |  | 1
Ending balance | (34) | (41)
Securities and other investments [member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 1,560 | (6,484)
Recognized in Income Statement | (293) | (702)
Recognized in Other Comprehensive Income | (1,245) | 8,984
Recognized in Equity | 2 | (10)
Translation and Other | 62 | (228)
Ending balance | 86 | 1,560
Sale of investments [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (30) | (40)
Recognized in Income Statement | 12 | 10
Ending balance | (18) | (30)
Goodwill and intangible assets [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (828) | (804)
Recognized in Income Statement | (12) | (6)
Translation and Other | 18 | (18)
Ending balance | (822) | (828)
Other [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 321 | 209
Recognized in Income Statement | (534) | 104
Recognized in Other Comprehensive Income | 347 | 5
Recognized in Equity | 10 | 6
Translation and Other | 6 | (3)
Ending balance | $ 150 | $ 321

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 2023-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 81 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81&doctype=Standard -URIDate 2023-03-23 + Details
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