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Fair value measurement (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Assets
Investment securities	$ 2,312,788	¥ 15,901,573	¥ 10,027,813
Recurring basis
Assets
Restricted cash		3,239,613	4,110,210
Total assets		21,077,379	24,092,959
Recurring basis | Wealth management products
Assets
Short-term investments		1,934,820	8,582,754
Recurring basis | Listed equity securities
Assets
Investment securities		15,901,573	10,027,813
Recurring basis | Money market funds
Assets
Cash equivalents		1,373	1,372,182
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Total assets		15,902,946	11,399,995
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Listed equity securities
Assets
Investment securities		15,901,573	10,027,813
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Assets
Cash equivalents		1,373	1,372,182
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets
Restricted cash		3,239,613	4,110,210
Total assets		5,174,433	12,692,964
Recurring basis | Significant Other Observable Inputs (Level 2) | Wealth management products
Assets
Short-term investments		¥ 1,934,820	¥ 8,582,754

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Fair value portion of cash which is restricted as to withdrawal or usage.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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-Publisher FASB
-Name Accounting Standards Codification
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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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