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Retirement Benefit Plans - Additional Information (Detail) yr in Millions, CAD in Millions	12 Months Ended
	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

X

- 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.

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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

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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

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- Definition

Defined contribution plan expense.

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- Definition

Effect from change in financial assumptions.

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- Definition

Effect Of Asset Ceiling

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