Share-based payments - Expenses (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Additional information related to stock options
Share-based compensation expenses related to share options granted	¥ 688,083	¥ 671,210	¥ 667,098
Fair value of shares vested	65,165	122,864	236
Employees
Additional information related to stock options
Share-based compensation expenses related to share options granted	65,165	65,884	¥ 54,505
Executives and employees
Additional information related to stock options
Unrecognized compensation cost related to unvested share options granted	¥ 67,474	¥ 131,395
Weighted-average period over which unrecognized compensation cost is to be recognized	1 year

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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