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Employee Future Benefits - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 CAD ($)
Disclosure of defined benefit plans [Line Items] |
Plan assets set aside for non-qualified cash balance plan | $ 0
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, 2018 | $ 2
Return-seeking assets [Member] |
Disclosure of defined benefit plans [Line Items] |
Target asset allocation for plan | 27.00%
Return-seeking assets [Member] | Canada [member] |
Disclosure of defined benefit plans [Line Items] |
Target asset allocation for plan | 20.00%
Liability-hedging assets [Member] |
Disclosure of defined benefit plans [Line Items] |
Target asset allocation for plan | 73.00%
Liability-hedging assets [Member] | Canada [member] |
Disclosure of defined benefit plans [Line Items] |
Target asset allocation for plan | 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, 2018 | $ 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, 2018 | 85
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, 2018 | $ 13

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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 2020-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_147_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of deficit or 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/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_140_a&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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