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Creations and Redemptions of Shares - Additional Information (Detail) - shares	Jun. 30, 2024	Dec. 31, 2023
Equity [Abstract]
Share represented as ETC	0.8151	0.8253

X

- Definition

Common share equivalent of ETC.

+ References

No definition available.

+ Details

Name:	etcg_CommonShareEquivalentOfETC
Namespace Prefix:	etcg_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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