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Leases (Details 2) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Leases      
Operating lease cost ¥ 3,377,389    
Short-term lease cost 1,212,899    
Total 4,590,288    
Cash paid for operating leases ¥ 3,460,898    
Lease expense   ¥ 4,571,036 ¥ 3,086,709