Amount Due From/To Ultimate Holding Company - Additional Information (Detail) - CNY (¥) ¥ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of transactions between related parties [line items]
Amount due to ultimate holding company	¥ 26,714	¥ 21,677
China Mobile Finance [member]
Disclosure of transactions between related parties [line items]
Amount due to ultimate holding company	¥ 26,706	¥ 21,637

The amount of current payables due to related parties. [Refer: Related parties [member]; Payables to related parties]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 78
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78&doctype=Standard
-URIDate 2020-01-01

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