The amount of net income allocated to other reserve funds for entities incorporated in China.

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The amount of net income allocated to statutory reserves for entities incorporated in China.

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n/a.

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Fulfillment costs represent packaging material costs and those costs incurred in outbound shipping, operating and staffing the Group's fulfillment and customer service centers, including costs attributable to buying, receiving, inspecting and warehousing inventories; picking, packaging and preparing customer orders for shipment; processing payment and related transaction costs and responding to inquiries from customers. Fulfillment costs also contain third party transaction fees, such as credit card processing and debit card processing fees.

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For entities incorporated in PRC, the minimum percentage of the after-tax net income allocated to a general reserve until the reserve balance is a specified percentage of the registered capital.

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For entities incorporated in PRC, the minimum percentage of the after-tax net income allocated to a statutory surplus until the reserve balance is a specified percentage of the registered capital.

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Represents number of capital leases.

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For entities incorporated in PRC, the ratio of the statutory reserve to the registered capital which triggers the elimination of the requirement to contribute to the statutory reserve.

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For entities incorporated in PRC, the ratio of the statutory surplus to the registered capital which triggers the elimination of the requirement to contribute to the statutory reserve.

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Represents the number of types of discounted coupons.

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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No definition available.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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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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Amount of right to recover product from customer on settling refund liability, classified as current.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Indicates (true false) whether practical expedient was elected to recognize incremental cost of obtaining contract as expense when incurred if amortization period would have been one year or less.

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Summary of significant accounting policies (Details 3) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) lease segment item	Dec. 31, 2019 CNY (¥) lease segment item	Dec. 31, 2018 CNY (¥) lease	Dec. 31, 2017 CNY (¥) lease	Dec. 31, 2019 CNY (¥)	Jan. 01, 2019 CNY (¥)	Jan. 01, 2018 CNY (¥)
Revenue
Liabilities for return allowances			¥ 363,191,000		¥ 425,135,000
Net revenues	$ 82,864,846	¥ 576,888,484,000	462,019,759,000	¥ 362,331,754,000
Accounts receivable, net of allowance for doubtful accounts	$ 889,222		11,109,988,000	16,359,147,000	6,190,588,000
Unearned revenue			15,461,245,000		21,347,848,000
Unearned revenue recognized		¥ 12,997,919,000
Revenue, Practical Expedient	true	true
Customer incentives and loyalty programs
Types of discounted coupons \| item	2	2
Fulfillment
Fulfillment	$ 5,310,127	¥ 36,968,041,000	32,009,658,000	25,865,128,000
Marketing
Advertising costs		¥ 19,285,939,000	¥ 15,970,433,000	¥ 12,375,922,000
Leases
Number of capital leases \| lease	0	0	0	0
Segment reporting
Number of major business segments \| segment	2	2
Statutory reserves
Appropriations of statutory reserves		¥ 58,753,000	¥ 764,446,000	¥ 503,028,000
Appropriations to other reserve funds		¥ 0	0	0
Recent accounting pronouncements
Accumulated deficit	$ (1,711,149)		(24,038,081,000)	(22,234,609,000)	(11,912,679,000)
ROU assets	$ 1,241,575				8,643,597,000
Lease liabilities					8,716,644,000	¥ 7,000,000,000
ASU 2014-09 \| Adjustment
Recent accounting pronouncements
Accumulated deficit							¥ 256,994,000
ASU 2016-18 \| Adjustments
Recent accounting pronouncements
ROU assets						¥ 7,000,000,000
PRC \| General reserve fund \| Foreign invested enterprise
Statutory reserves
Minimum portion of after tax profit to be allocated to general reserve under PRC law (as a percentage)	10.00%	10.00%
Maximum percentage of statutory general reserve related to entity's registered capital	50.00%	50.00%
PRC \| Statutory surplus reserve \| Domestic enterprise
Statutory reserves
Minimum portion of after tax profit to be allocated to statutory surplus under PRC law (as a percentage)	10.00%	10.00%
Maximum percentage of statutory surplus reserve related to entity's registered capital	50.00%	50.00%
Electronics and home appliance products
Revenue
Net revenues		¥ 328,703,453,000	280,059,089,000	236,268,621,000
General merchandise products
Revenue
Net revenues		182,030,514,000	136,049,657,000	95,555,789,000
Shipping
Fulfillment
Fulfillment		17,858,972,000	15,216,351,000	12,691,013,000
Online marketplace and marketing services
Revenue
Net revenues		42,680,212,000	33,531,862,000	25,390,981,000
Logistics and other services
Revenue
Net revenues		¥ 23,474,305,000	12,379,151,000	¥ 5,116,363,000
Accrued expenses and other current liabilities
Revenue
Liabilities for return allowances			363,191,000		425,135,000
Prepayments and other current assets
Revenue
Rights to recover products from customers			¥ 381,165,000		¥ 454,298,000