FAIR VALUE MEASUREMENT (Details) - CNY (¥) ¥ in Thousands	Dec. 31, 2021	Dec. 31, 2020
FAIR VALUE MEASUREMENT
Convertible bonds payable fair value	¥ 2,246,231	¥ 3,683,816

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

No definition available.

Name:	us-gaap_ConvertibleDebtFairValueDisclosures
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant