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Restricted Net Assets (Details) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Restricted Net Assets
Percentage of funds kept aside for payment of dividends	10.00%
Net assets transfer restricted portion	¥ 212.5	¥ 183.0

X

- Definition

Represent the net assets transfer restricted portion in the form of dividends, loans or advances.

+ References

No definition available.

+ Details

Name:	tc_NetAssetsTransferRestrictedPortion
Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage of general reserve fund and the statutory surplus fund kept aside for payment of dividends.

+ References

No definition available.

+ Details

Name:	tc_PercentageOfFundsKeptAsideForPaymentOfDividends
Namespace Prefix:	tc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	tc_RestrictedAssetsNetAbstract
Namespace Prefix:	tc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration