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Retirement Benefit Plans - Additional Information (Detail) yr in Millions, CAD in Millions | 12 Months Ended
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Dec. 31, 2017 CAD yr | Dec. 31, 2016 CAD
Disclosure of net defined benefit liability (asset) [line items] |  |
Surplus(deficit)of plan | CAD 44 | CAD 58
Expected contribution to defined benefit pension plans | 28 |
Defined contribution expense | CAD 44 | CAD 44
Defined Benefit Pension Plans [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Weighted average duration of the defined benefit obligation | yr | 14 |
Non-Pension Post-Retirement Benefit [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Weighted average duration of the defined benefit obligation | yr | 17 |
Non-Pension Post-Retirement Benefit [member] | British Columbia [Member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Effect from change in financial assumptions | CAD 104 |

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- Definition 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. + References No definition available. + Details
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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 2017-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_148_d_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_147_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Defined contribution plan expense. + References No definition available. + Details
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- Definition Effect from change in financial assumptions. + References No definition available. + Details
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- Details
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- Details
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