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PROPERTY AND EQUIPMENT, NET - Additional information (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
PROPERTY AND EQUIPMENT, NET    
Property and equipment, net ¥ 29,596,061 ¥ 19,184,639
Payables for purchase of property and equipment due beyond one year 139,162 231,458
Asset Pledged as Collateral [Member]    
PROPERTY AND EQUIPMENT, NET    
Property and equipment, net ¥ 3,497,447 ¥ 2,493,872