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PROPERTY AND EQUIPMENT, NET - Acquired under finance leases and other financing arrangement (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Carrying amounts    
Finance leases, net ¥ 8,207,825 ¥ 6,070,349
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Finance leases, net