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Commitments and contingencies (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating lease commitments      
Rental and bandwidth leasing expenses ¥ 3,892,365 ¥ 2,827,353 ¥ 1,827,441
Future minimum lease payments under non-cancelable operating lease agreements with initial terms of one year or more      
2018 3,283,662    
2019 2,122,122    
2020 1,359,985    
2021 742,045    
2022 415,180    
2023 and thereafter 694,684    
Total 8,617,678    
Office and fulfillment centers      
Future minimum lease payments under non-cancelable operating lease agreements with initial terms of one year or more      
2018 2,845,163    
2019 1,977,245    
2020 1,313,517    
2021 737,960    
2022 411,823    
2023 and thereafter 689,488    
Total 7,975,196    
Bandwidth      
Future minimum lease payments under non-cancelable operating lease agreements with initial terms of one year or more      
2018 438,499    
2019 144,877    
2020 46,468    
2021 4,085    
2022 3,357    
2023 and thereafter 5,196    
Total ¥ 642,482