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Share-based compensation (Details 3)	1 Months Ended		12 Months Ended
	May 31, 2015 $ / shares	May 31, 2015 CNY (¥) shares	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2015 USD ($)
Share-based compensation
Share-based compensation expenses			¥ 2,780,062,000	¥ 2,061,432,000	¥ 1,076,286,000
Founder | Options | Share Incentive Plan
Share-based compensation
Term of compensation plan		10 years
Cash salary to be received per year		¥ 1
Cash bonus to be received		¥ 0
Vesting schedule		10 years
Share-based compensation expenses			227,326,000	¥ 318,156,000	¥ 240,024,000
Assumptions used to calculate estimated fair value of each option grant
Exercise multiples					2.0
Expected dividend yield (as a percent)					0.00%
Expected term (in years)					10 years
Unrecognized share-based compensation expense related to the founder share options granted			¥ 574,653,000
Weighted-average period over which share-based compensation expense is expected to be recognized			7 years 4 months 24 days
Founder | Options | Share Incentive Plan | Minimum
Assumptions used to calculate estimated fair value of each option grant
Expected volatility (as a percent)					36.00%
Risk-free interest rate (per annum) (as a percent)					2.74%
Fair value of the underlying shares on the date of option grants (in dollars) | $						$ 16.70
Founder | Options | Share Incentive Plan | Maximum
Assumptions used to calculate estimated fair value of each option grant
Expected volatility (as a percent)					38.00%
Risk-free interest rate (per annum) (as a percent)					2.79%
Fair value of the underlying shares on the date of option grants (in dollars) | $						$ 16.93
Each anniversary | Founder | Options | Share Incentive Plan
Share-based compensation
Vesting percentage (as a percent)		10.00%
Class A ordinary shares | Founder | Options | Share Incentive Plan
Share-based compensation
Granted (in shares) | shares		26,000,000
Exercise price | $ / shares	$ 16.70
ADS | Founder | Options | Share Incentive Plan
Share-based compensation
Exercise price | $ / shares	$ 33.40

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Amount of cash bonus received within the compensation plan period.

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Amount of cash salary received per year within the compensation plan period.

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Represents the exercise multiple which is estimated as the ratio of fair value of underlying shares over the exercise price as at the time the option is exercise.

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The fair value of the underlying shares on the date of option grants that is used in valuing an option on its own shares.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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