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Post-retirement benefits - Summary of main assumptions rate for valuations of plans (Parenthetical) (Detail)	Dec. 31, 2018	Dec. 31, 2017
Disclosure Of Net Defined Benefit Liability Asset [Abstract]
Assumption for the consumer price index	2.20%	2.10%

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 2017-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard
-URIDate 2017-03-09

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