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Commitments and contingencies (Details) - Offices and fulfillment infrastructures - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating lease commitments      
Rental expenses ¥ 4,571,036 ¥ 3,086,709 ¥ 2,269,259
Future minimum lease payments under non-cancelable operating lease agreements with initial terms of one year or more      
2019 3,596,926    
2020 2,553,344    
2021 1,452,812    
2022 907,116    
2023 459,342    
2024 and Thereafter 1,044,818    
Total ¥ 10,014,358