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SIGNIFICANT ACCOUNTING POLICIES - Employee benefits & taxation (Details) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
SIGNIFICANT ACCOUNTING POLICIES
Employee social security and welfare benefits	¥ 251.0	¥ 159.1	¥ 59.3
Product | Maximum
SIGNIFICANT ACCOUNTING POLICIES
VAT rate	20.00%
Product | Minimum
SIGNIFICANT ACCOUNTING POLICIES
VAT rate	9.00%
Service | Maximum
SIGNIFICANT ACCOUNTING POLICIES
VAT rate	6.00%
Service | Minimum
SIGNIFICANT ACCOUNTING POLICIES
VAT rate	1.00%

X

- Definition

Amount of expense incurred in connection with the employee social security and welfare benefits.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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X

- Definition

Percentage of value added tax on revenues.

+ References

No definition available.

+ Details

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Namespace Prefix:	cha_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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X

- Details

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X

- Details

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X

- Details

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