EARNING (LOSS) PER SHARE - Additional Information (Details)	12 Months Ended
Dec. 31, 2021 shares
EARNING (LOSS) PER SHARE
Shares issued to depositary bank (in shares)	7,800,000

Number of depositary shares issued, which will be used to settle stock option awards upon their exercise.

No definition available.

Name:	vnet_DepositarySharesIssued
Namespace Prefix:	vnet_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration