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Employee Future Benefits - Summary of Pension and Retiree Welfare Plans (Detail) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Pension defined benefit plans [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	$ 120
Actuarial losses (gains) due to:
Experience	11	$ 5
Demographic assumption changes	14
Economic assumption changes	119	(835)
Return on plan assets (excluding interest income)	(129)	869
Ending balance	124	120
Pension defined benefit plans [member] | Present value of defined benefit obligation [Member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	3,794	4,560
Current service cost	41	43
Past service cost - amendment	0	(6)
Interest cost	184	127
Plan participants' contributions	0
Actuarial losses (gains) due to:
Experience	11	5
Demographic assumption changes	14	0
Economic assumption changes	119	(835)
Benefits paid	(308)	(299)
Impact of changes in foreign exchange rates	(66)	199
Ending balance	3,789	3,794
Pension defined benefit plans [member] | Plan assets [Member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	3,722	4,510
Interest cost	181	127
Plan participants' contributions	0
Actuarial losses (gains) due to:
Benefits paid	(308)	(299)
Return on plan assets (excluding interest income)	129	(869)
Impact of changes in foreign exchange rates	(67)	205
Employer contributions	59	59
Administration costs	(10)	(11)
Ending balance	3,706	3,722
Retiree welfare plans [Member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	(57)
Actuarial losses (gains) due to:
Experience	(10)	(13)
Demographic assumption changes	1
Economic assumption changes	16	(112)
Return on plan assets (excluding interest income)	(17)	91
Ending balance	(76)	(57)
Retiree welfare plans [Member] | Present value of defined benefit obligation [Member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	466	584
Interest cost	22	16
Plan participants' contributions	3	3
Actuarial losses (gains) due to:
Experience	(10)	(13)
Demographic assumption changes	1	0
Economic assumption changes	16	(112)
Benefits paid	(38)	(40)
Impact of changes in foreign exchange rates	(10)	28
Ending balance	450	466
Retiree welfare plans [Member] | Plan assets [Member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	523	587
Interest cost	25	16
Plan participants' contributions	3	3
Actuarial losses (gains) due to:
Benefits paid	(38)	(40)
Return on plan assets (excluding interest income)	17	(91)
Impact of changes in foreign exchange rates	(15)	39
Employer contributions	12	11
Administration costs	(1)	(2)
Ending balance	$ 526	$ 523

X

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
-Subparagraph c
-Clause ii
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-URIDate 2023-03-23

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X

- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
-Subparagraph c
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- Definition

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
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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.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
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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 2023-01-01
-Paragraph 140
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X

- Definition

The amount of expense (income) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Post-employment benefit expense in profit or loss, defined benefit plans; Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from past service cost]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 135
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_135_b&doctype=Standard
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
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-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_141_g&doctype=Standard
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X

- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2023-01-01
-Paragraph 141
-Subparagraph c
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- Definition

Actuarial gains (losses) arising from experience, net defined benefit liability (asset).

+ References

No definition available.

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Administration costs, net defined benefit liability (asset).

+ References

No definition available.

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