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Summary of significant accounting policies (Details 2) - CNY (¥) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2015 | Dec. 31, 2016
Accounts receivable, net |  |  |
Allowance for doubtful accounts | ¥ 16,988,000 | ¥ 11,525,000 |
Nonrecourse securitization debt |  |  |
Consumer credit receivables financial assets derecognized | 8,000,000,000 |  |
Proceeds from financial assets sold and derecognized through sales type arrangements | 8,000,000,000 | ¥ 0 | ¥ 0
Accounts receivables |  |  |
Nonrecourse securitization debt |  |  |
Collateralized amount | 11,701,973,000 |  | 10,745,565,000
Consumer credit receivables financial assets derecognized | 5,693,223,000 |  |
Loans |  |  |
Nonrecourse securitization debt |  |  |
Collateralized amount | 4,512,764,000 |  | ¥ 2,756,762,000
Consumer credit receivables financial assets derecognized | ¥ 2,306,777,000 |  |
Nonrecourse securitization debt |  |  |
Nonrecourse securitization debt |  |  |
Weighted average interest rate | 5.33% |  | 4.49%
Minimum |  |  |
Land use rights, net |  |  |
Estimated useful lives (in years) | 34 years |  |
Maximum |  |  |
Land use rights, net |  |  |
Estimated useful lives (in years) | 70 years |  |
JD Baitiao | Accounts receivables |  |  |
Accounts receivable, net |  |  |
Allowance for doubtful accounts | ¥ 0 |  |
Strategic Cooperation Agreement |  |  |
Intangible assets, net |  |  |
Estimated useful lives (in years) | 5 years |  |
Non-compete Agreement | Minimum |  |  |
Intangible assets, net |  |  |
Estimated useful lives (in years) | 5 years |  |
Non-compete Agreement | Maximum |  |  |
Intangible assets, net |  |  |
Estimated useful lives (in years) | 8 years |  |
Technology | Minimum |  |  |
Intangible assets, net |  |  |
Estimated useful lives (in years) | 2 years |  |
Technology | Maximum |  |  |
Intangible assets, net |  |  |
Estimated useful lives (in years) | 7 years |  |
Domain names and trademark | Minimum |  |  |
Intangible assets, net |  |  |
Estimated useful lives (in years) | 5 years |  |
Domain names and trademark | Maximum |  |  |
Intangible assets, net |  |  |
Estimated useful lives (in years) | 20 years |  |
Others | Minimum |  |  |
Intangible assets, net |  |  |
Estimated useful lives (in years) | 2 years |  |
Others | Maximum |  |  |
Intangible assets, net |  |  |
Estimated useful lives (in years) | 10 years |  |

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