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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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- 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 2018-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_147_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_140_a&doctype=Standard -URIDate 2018-03-16 + Details
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