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Summary of significant accounting policies (Details 2) - CNY (¥) ¥ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | ---
Nonrecourse securitization debt |  |  |
Consumer credit receivables financial assets derecognized | ¥ 15,500,000 |  | ¥ 3,500,000
Proceeds from derecognition | 15,500,000 |  | 3,500,000
Accounts receivables |  |  |
Nonrecourse securitization debt |  |  |
Collateralized amount | 0 | ¥ 3,116,309 |
Consumer credit receivables financial assets derecognized | 10,787,315 |  | 2,521,643
Loan receivables |  |  |
Nonrecourse securitization debt |  |  |
Collateralized amount | 0 | ¥ 1,281,361 |
Consumer credit receivables financial assets derecognized | ¥ 4,712,685 |  | ¥ 978,357
Nonrecourse securitization debt |  |  |
Nonrecourse securitization debt |  |  |
Weighted average interest rate |  | 5.81% |

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