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Employee Future Benefits - Summary of Pension and Retiree Welfare Plans (Detail) - CAD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	$ 0
Actuarial losses (gains) due to:
Ending balance		$ 0
Pension defined benefit plans [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	378,000,000
Actuarial losses (gains) due to:
Experience		15,000,000
Demographic assumption changes	35,000,000
Economic assumption changes	(250,000,000)	214,000,000
Ending balance	494,000,000	378,000,000
Return on plan assets (excluding interest income)	315,000,000	(312,000,000)
Pension defined benefit plans [member] | Present value of defined benefit obligation [Member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	4,706,000,000	4,767,000,000
Current service cost	42,000,000	48,000,000
Past service cost - amendments	8,000,000
Past service cost - curtailments	10,000,000
Interest cost	165,000,000	182,000,000
Plan participants' contributions	1,000,000	1,000,000
Actuarial losses (gains) due to:
Experience		15,000,000
Demographic assumption changes	35,000,000
Economic assumption changes	(250,000,000)	214,000,000
Benefits paid	(304,000,000)	(315,000,000)
Impact of changes in foreign exchange rates	262,000,000	(206,000,000)
Ending balance	4,675,000,000	4,706,000,000
Pension defined benefit plans [member] | Plan assets [Member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	4,328,000,000	4,277,000,000
Interest cost	153,000,000	164,000,000
Plan participants' contributions	1,000,000	1,000,000
Actuarial losses (gains) due to:
Benefits paid	(304,000,000)	(315,000,000)
Impact of changes in foreign exchange rates	254,000,000	(191,000,000)
Ending balance	4,190,000,000	4,328,000,000
Return on plan assets (excluding interest income)	(315,000,000)	312,000,000
Employer contributions	79,000,000	85,000,000
Administration costs	(6,000,000)	(5,000,000)
Retiree welfare plans [Member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	78,000,000
Actuarial losses (gains) due to:
Experience	(7,000,000)	(9,000,000)
Demographic assumption changes	(1,000,000)
Economic assumption changes	(56,000,000)	41,000,000
Ending balance	30,000,000	78,000,000
Return on plan assets (excluding interest income)	16,000,000	(30,000,000)
Retiree welfare plans [Member] | Present value of defined benefit obligation [Member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	665,000,000	682,000,000
Current service cost		1,000,000
Past service cost - curtailments	12,000,000
Interest cost	24,000,000	26,000,000
Plan participants' contributions	4,000,000	4,000,000
Actuarial losses (gains) due to:
Experience	(7,000,000)	(9,000,000)
Demographic assumption changes	(1,000,000)
Economic assumption changes	(56,000,000)	41,000,000
Benefits paid	(45,000,000)	(45,000,000)
Impact of changes in foreign exchange rates	44,000,000	(35,000,000)
Ending balance	640,000,000	665,000,000
Retiree welfare plans [Member] | Plan assets [Member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	587,000,000	603,000,000
Interest cost	21,000,000	23,000,000
Plan participants' contributions	4,000,000	4,000,000
Actuarial losses (gains) due to:
Benefits paid	(45,000,000)	(45,000,000)
Impact of changes in foreign exchange rates	51,000,000	(38,000,000)
Ending balance	610,000,000	587,000,000
Return on plan assets (excluding interest income)	(16,000,000)	30,000,000
Employer contributions	10,000,000	12,000,000
Administration costs	$ (2,000,000)	$ (2,000,000)

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 2018-01-01
-Paragraph 141
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- 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
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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
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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
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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
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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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
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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
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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 2018-01-01
-Paragraph 140
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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
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-Paragraph 141
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- 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 plans 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]; Interest expense (income), net defined benefit liability (asset)]

+ References

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

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Administration costs, net defined benefit liability (asset).

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Past service cost curtailments, net defined benefit liability (asset).

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No definition available.

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Past service cost plan amendments net defined benefit liability asset.

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