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Short-term borrowings - Additional Information (Details) - Unsecured bank loans - CNY (¥) ¥ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Short-term borrowings |  |
Interest rate |  | 4.00%
Total line of credit | ¥ 1,110,000 | ¥ 1,000,000
Unused portion of line of credit | 140,000 | 172,696
Short-term borrowings guaranteed | ¥ 870,000 | ¥ 0
Minimum |  |
Short-term borrowings |  |
Interest rate | 4.30% |
Average |  |
Short-term borrowings |  |
Interest rate | 4.35% |
Maximum |  |
Short-term borrowings |  |
Interest rate | 4.38% |

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- Definition The amount of short-term debt guaranteed by other parties. + References No definition available. + Details
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Namespace Prefix: | exc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- 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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- Definition The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date which accrues interest at a set, unchanging rate. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Details
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- Details
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