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Employee Future Benefits - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Disclosure of defined benefit plans [Line Items] |  |
Assets set aside for plan | $ 0 |
Canadian plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2023 | $ 3 |
Return-seeking assets [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Target asset allocation for plan | 30.00% | 30.00%
Return-seeking assets [Member] | Canada [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Target asset allocation for plan | 20.00% | 20.00%
Liability-hedging assets [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Target asset allocation for plan | 70.00% | 70.00%
Liability-hedging assets [Member] | Canada [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Target asset allocation for plan | 80.00% | 80.00%
Pension defined benefit plans [member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2023 | $ 65 |
Defined contribution pension plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2023 | 89 |
Retiree welfare plans [Member] |  |
Disclosure of defined benefit plans [Line Items] |  |
Estimate of expected cash payments for employee future benefits for the year ending December 31, 2023 | $ 13 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 147 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_147_b&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 148 -Subparagraph d -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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