Fair Value of ETC - Additional Information (Detail)	Jun. 30, 2023 ETC $ / shares	Dec. 31, 2022 ETC $ / shares
Fair Value Disclosures [Abstract]
Investment owned balance shares held by custodian \| ETC	11,695,248.44602377	11,841,144.97143656
Ethereum classic Fair Value Per Share \| $ / shares	$ 19.71	$ 15.82

Investment owned, balance, shares held by custodian.

No definition available.

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