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Summary of significant accounting policies (Details 2) - CNY (¥)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Nonrecourse Securitization Debt
Collateralized accounts receivables and loans	¥ 4,320,000,000	¥ 0
Weighted average interest rate	5.30%
Minimum
Land use rights, net
Estimated useful lives	40 years
Maximum
Land use rights, net
Estimated useful lives	70 years
Domain name
Intangible assets, net
Estimated useful lives	10 years
Copyrights | Minimum
Intangible assets, net
Estimated useful lives	2 years
Copyrights | Maximum
Intangible assets, net
Estimated useful lives	5 years

X

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- Definition

Useful life of land use rights, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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- Definition

Weighted average interest rate of debt outstanding.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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