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Long-term investments (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Long-term investments.
Equity method investments	¥ 420,445	¥ 678,225
Equity securities	69,319	675,824
Total long-term investments	¥ 489,764	¥ 1,354,049

X

- Definition

The gross amount on entity's balance sheet of its investment in common stock of an equity method investee.

+ References

No definition available.

+ Details

Name:	exc_EquityMethodInvestmentsGross
Namespace Prefix:	exc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of equity security without a readily determinable fair value before impairment.

+ References

No definition available.

+ Details

Name:	exc_EquitySecuritiesWithoutReadilyDeterminableFairValueGross
Namespace Prefix:	exc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration