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Share-based compensation (Details) - CNY (¥)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based compensation
Share-based compensation expenses	¥ 4,155,933,000	¥ 3,694,955,000	¥ 3,659,989,000
Cost of revenues
Share-based compensation
Share-based compensation expenses	98,168,000	82,243,000	71,983,000
Fulfillment
Share-based compensation
Share-based compensation expenses	646,331,000	440,167,000	418,895,000
Marketing
Share-based compensation
Share-based compensation expenses	346,952,000	258,860,000	190,499,000
Research and development
Share-based compensation
Share-based compensation expenses	1,400,067,000	1,340,317,000	1,162,579,000
General and administrative
Share-based compensation
Share-based compensation expenses	¥ 1,664,415,000	¥ 1,573,368,000	¥ 1,816,033,000

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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+ References

No definition available.

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