Retained Earnings - Additional Information (Detail) - CNY (¥) ¥ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
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 PRC is required to annually appropriate 10% of after-tax income to statutory surplus reserve prior to payment of any dividends, unless such reserve funds have reached 50% of its respective registered capital.
Accumulated statutory surplus reserve	¥ 4,240	¥ 3,330

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 2021-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard
-URIDate 2021-03-24

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