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LEASES - Lease arrangements (Details)
¥ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
lease
Dec. 31, 2020
CNY (¥)
Lease arrangements    
Finance lease liabilities ¥ 4,663,508 ¥ 6,580,102
Operating lease liabilities ¥ 765,137 1,629,153
Data center buildings and land leases    
Lease arrangements    
Finance lease liabilities   1,634,419
Operating lease liabilities   ¥ 768,613
Hebei equipment lease    
Lease arrangements    
Number of leases agreements with third-party lessor | lease 2