Related Party Transactions - Transactions with CMCC Group (Detail) - CNY (¥) ¥ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of transactions between related parties [line items]
Interest expenses	¥ 170	¥ 187	¥ 142
Short-term bank deposits received	26,706	21,637	10,873
Short-term bank deposits repaid	21,637	10,873	8,611
China Mobile Communications Corporation [member]
Disclosure of transactions between related parties [line items]
Consideration of assets transferred		873
China Mobile Communications Corporation [member] \| Telecommunications [member]
Disclosure of transactions between related parties [line items]
Services revenue	979	495	71
Services charges	188	103
China Mobile Communications Corporation [member] \| Property leasing and management [member]
Disclosure of transactions between related parties [line items]
Services revenue	280	197	226
Services charges	1,365	1,129	1,009
China Mobile Communications Corporation [member] \| Network assets [member]
Disclosure of transactions between related parties [line items]
Charges for use of network assets	1,891	1,448	2,308
China Mobile Communications Corporation [member] \| Network capacity [member]
Disclosure of transactions between related parties [line items]
Charges for use of network capacity	¥ 4	¥ 30	¥ 402

Charges for use of network assets.

No definition available.

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- Definition

Charges for use of network capacity.

+ References

No definition available.

+ Details

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- Definition

Short-term bank deposits received related party transactions.

+ References

No definition available.

+ Details

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- Definition

Short-term bank deposits repaid related party transactions.

+ References

No definition available.

+ Details

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- Definition

The fair value, at acquisition date, of the consideration transferred in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2020-01-01
-Paragraph B64
-Subparagraph f
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-URIDate 2020-01-01

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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- Definition

The amount of interest expense on other financial liabilities. [Refer: Interest expense; Other financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
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- Definition

The amount of revenue arising from the rendering of services in related party transactions. [Refer: Revenue; Related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 24
-IssueDate 2020-01-01
-Paragraph 21
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- Definition

The amount of services received in related party transactions. [Refer: Related parties [member]]

+ References

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