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Amount of assets pledged to secure a debt instrument.

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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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No definition available.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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Amount of derecognized financial assets from transactions which comprise an initial transfer and an agreement entered into in contemplation of the initial transfer resulting in retention of substantially all of the exposure to the economic return throughout the term of the transaction, at the date of derecognition.

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Represents the initial fair value recorded for assets received on transfer of financial assets in a securitization, asset-backed financing arrangement, or a similar transfer which transaction is recognized as a sale of the transferred financial assets.

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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