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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 |

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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 + Details
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