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Revenue from Contracts with Customers - Summary of Contract Balances (Parenthetical) (Detail) ¥ in Millions	12 Months Ended
	Dec. 31, 2018 CNY (¥)
Disclosure of contract assets liabilities [abstract]
Transaction prices allocated to the remaining performance obligation	¥ 149.0
Transaction prices expected to be realised	Three years
Contract performance obligations description	According to the business customary practice, the remaining performance obligations (unfulfilled maintenance service) at the year end is expected to be satisfied within 1-3years.

X

- Definition

Disclosure of contract assets liabilities.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The description of when the entity typically satisfies its performance obligations. [Refer: Performance obligations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 119
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_119_a&doctype=Standard
-URIDate 2018-03-16

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Namespace Prefix:	ifrs-full_
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Balance Type:	na
Period Type:	duration

X

- Definition

The explanation of when the entity expects to recognise the transaction price allocated to the remaining performance obligations as revenue. [Refer: Revenue; Transaction price allocated to remaining performance obligations]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 120
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_120_b_ii&doctype=Standard
-URIDate 2018-03-16

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X

- Definition

The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 120
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_120_a&doctype=Standard
-URIDate 2018-03-16

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant