Related Party Transactions - Amounts due from/to CMCC Group (Detail) - CNY (¥) ¥ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of transactions between related parties [line items]
Prepayments and other current assets	¥ 25,713	¥ 26,708
Amounts due from ultimate holding company	1,396	1,350
Right-of-use assets	65,091	74,308
Amounts due to ultimate holding company	26,714	21,677
China Mobile Communications Corporation [member]
Disclosure of transactions between related parties [line items]
Accounts receivable	995	630
Other receivables	372	277
Prepayments and other current assets	6	2
Right-of-use assets	679	399
Lease liabilities	770	468
Accounts payable	4,770	6,741
Accrued expenses and other payables	1,696	90
Ultimate Holding Company [Member]
Disclosure of transactions between related parties [line items]
Amounts due from ultimate holding company	1,396	1,350
Amounts due to ultimate holding company	¥ 26,714	¥ 21,677

Accrued expenses and other payables related party transactions.

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- Definition

Other receivables from related parties.

+ References

No definition available.

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- Definition

The amounts payable resulting from related party transactions. [Refer: Related parties [member]]

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The amounts receivable resulting from related party transactions. [Refer: Related parties [member]]

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- Definition

The amount of current prepayments and other current assets. [Refer: Other current assets; Current prepayments]

+ References

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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.

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- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

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The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

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

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The amount of receivables due from related parties. [Refer: Related parties [member]]

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