Employee Benefit and Related Expenses - Additional Information (Detail) ¥ in Millions	12 Months Ended
Dec. 31, 2020 CNY (¥)
2020 Defined Benefit Plans [member]
Disclosure of net defined benefit liability (asset) [line items]
Service costs recognized in respect of employee benefit plan	¥ 4,615

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2020-01-01
-Paragraph 141
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_a&doctype=Standard
-URIDate 2020-01-01

Name:	ifrs-full_CurrentServiceCostNetDefinedBenefitLiabilityAsset
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration