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Post-retirement benefits - Summary of main assumptions rate for valuations of plans (Parenthetical) (Detail)	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Net Defined Benefit Liability Asset [Abstract]
Assumption for the consumer price index	2.10%	2.20%

X

- References

No definition available.

+ Details

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- Definition

Any other material assumption used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Actuarial assumptions [member]; Defined benefit obligation, at present value]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2016-01-13
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2016-03-30&anchor=para_144&doctype=Standard
-URIDate 2016-03-31

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