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Summary of significant accounting policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Foreign currency translation
Total exchange gains/(losses)	$ 17,822	¥ 124,070,000	¥ (192,491,000)	¥ 213,482,000
Total foreign currency translation adjustments gains/(losses)	$ 114,004	¥ 793,671,000	2,696,784,000	(822,052,000)
Convenience translation
Convenience translation rate (RMB to USD)		6.9618
Loan receivables, net
Provision for the doubtful loan receivables		¥ 0	0
Construction in progress
Amount of construction in progress		5,806,308,000	6,553,712,000	3,196,516,000
Others, net
Foreign currency translation
Total exchange gains/(losses)		¥ 124,070,000	(192,491,000)	213,482,000
Minimum
Loan receivables, net
Loan periods extended range	1 month	1 month
Maximum
Loan receivables, net
Loan periods extended range	24 months	24 months
Electronic equipment | Minimum
Property, equipment and software, net
Estimated useful Lives (in Years)	3 years	3 years
Electronic equipment | Maximum
Property, equipment and software, net
Estimated useful Lives (in Years)	5 years	5 years
Office equipment
Property, equipment and software, net
Estimated useful Lives (in Years)	5 years	5 years
Vehicles | Minimum
Property, equipment and software, net
Estimated useful Lives (in Years)	3 years	3 years
Vehicles | Maximum
Property, equipment and software, net
Estimated useful Lives (in Years)	5 years	5 years
Logistic,warehouse and other heavy equipment | Minimum
Property, equipment and software, net
Estimated useful Lives (in Years)	5 years	5 years
Logistic,warehouse and other heavy equipment | Maximum
Property, equipment and software, net
Estimated useful Lives (in Years)	10 years	10 years
Software | Minimum
Property, equipment and software, net
Estimated useful Lives (in Years)	3 years	3 years
Software | Maximum
Property, equipment and software, net
Estimated useful Lives (in Years)	5 years	5 years
Building
Property, equipment and software, net
Estimated useful Lives (in Years)	40 years	40 years
Building improvement | Minimum
Property, equipment and software, net
Estimated useful Lives (in Years)	5 years	5 years
Building improvement | Maximum
Property, equipment and software, net
Estimated useful Lives (in Years)	10 years	10 years
Other non-current assets
Loan receivables, net
Loan receivables		¥ 179,886,000	¥ 105,455,000	¥ 243,624,000

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