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CASH AND RESTRICTED CASH (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CASH AND RESTRICTED CASH        
Cash ¥ 16,259,457 ¥ 5,810,938    
Restricted cash - current assets 86,829 34,299    
Restricted cash - non-current assets 146,643 128,025    
Total cash and restricted cash shown in the consolidated statements of cash flows ¥ 16,492,929 ¥ 5,973,262 ¥ 2,284,748 ¥ 1,947,600