Accrued expenses and other current liabilities (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2018 CNY (¥)
Accrued expenses and other current liabilities
Accrued advertising expense		¥ 1,011,400	¥ 821,059
Accrued shipping and handling expenses		925,864	418,187
Accrued payroll and social benefits		896,365	1,027,288
Deposits from delivery service providers		475,497	379,403
Income tax payables		652,624	269,580
Other tax payables (Note a)		690,338	948,754
Accrued rental expenses		73,861	73,614
Accrued administrative expenses		384,427	440,784
Amounts received on behalf of third-party merchants (Note b)		946,100	741,109
Refund liability (Note c)		225,274	190,383
Others		252,825	202,444
Total	$ 938,633	¥ 6,534,575	¥ 5,512,605
Period of unconditional right of return	7 days

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for advertising of the entity's goods and services. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for contractual rent under lease arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer, classified as current.

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Represents the carrying value as of the balance sheet date of obligations incurred through that date and payable for accrued administrative expenses. It is used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying amount, as of the balance sheet date, of the amounts received on behalf of third-party merchants.

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Period of time for unconditional right of return, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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