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Income taxes - Withholding tax on undistributed dividends (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Withholding tax rate (in percent) | 10.00% |  |
Deferred tax liability accrued for dividend withholding taxes | ¥ 0 | ¥ 0 | ¥ 0

X
- Definition Represents the deferred tax liability accrued for dividend withholding taxes. + References No definition available. + Details
Name: | exc_DeferredTaxLiabilityAccruedForDividendWithholdingTaxes
Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the withholding tax rate. + References No definition available. + Details
Name: | exc_WithholdingTaxRate
Namespace Prefix: | exc_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration