Retained Earnings - Additional Information (Detail) - CNY (¥) ¥ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Text block [abstract]
Description of statutory surplus reserve	each of the Company’s subsidiaries, the Consolidated Affiliated Entities and Subsidiaries of Consolidated Affiliated Entities incorporated in the PRC is required to annually appropriate 10% of its after-tax income to its statutory surplus reserve prior to payment of any dividends, unless such reserve funds have reached 50% of such entity’s registered capital.
Accumulated statutory surplus reserve	¥ 4,432	¥ 4,240

A component of equity representing reserves created based on legal requirements.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard
-URIDate 2022-03-24

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