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Employee Future Benefits - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Dec. 31, 2018 CAD ($) Employees	Dec. 31, 2018 CAD ($) Employees	Dec. 31, 2017 CAD ($)
Disclosure of defined benefit plans [Line Items]
Percentage of final average pay pension plans to global pension obligations			50.00%
Curtailment gain (loss)	$ 22,000,000
Plan assets set aside for non-qualified cash balance plan			$ 0
Assets set aside for plan			$ 0
Canada [member]
Disclosure of defined benefit plans [Line Items]
Number of employees under voluntary exit program | Employees	1,270	1,270
U.S. [member]
Disclosure of defined benefit plans [Line Items]
Number of employees under voluntary exit program | Employees	229	229
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		$ 12,000,000
Return-seeking assets [Member]
Disclosure of defined benefit plans [Line Items]
Target asset allocation for plan	27.00%	27.00%
Return-seeking assets [Member] | Canada [member]
Disclosure of defined benefit plans [Line Items]
Target asset allocation for plan	0.20%	0.20%
Liability-hedging assets [Member]
Disclosure of defined benefit plans [Line Items]
Target asset allocation for plan	73.00%	73.00%
Liability-hedging assets [Member] | Canada [member]
Disclosure of defined benefit plans [Line Items]
Target asset allocation for plan	0.80%	0.80%
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		$ 88,000,000
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		78,000,000
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		$ 12,000,000

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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
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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
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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
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Maximum percentage of final average pay pension plans to global pension obligations.

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Number of employees under voluntary exit program.

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