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Fair value measurement (Details) ¥ in Millions, $ in Millions | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥)
--- | --- | --- | ---
Assets |  |  |
Investment securities | ¥ 19,088 | $ 2,995 | ¥ 39,085
Recurring basis |  |  |
Assets |  |  |
Restricted cash | 5,926 |  | 4,434
Total assets | 102,024 |  | 67,813
Recurring basis | Wealth management products |  |  |
Assets |  |  |
Short-term investments | 77,010 |  | 24,294
Recurring basis | Listed equity securities |  |  |
Assets |  |  |
Investment securities | 19,088 |  | 39,085
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets |  |  |
Total assets | 19,088 |  | 39,085
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Listed equity securities |  |  |
Assets |  |  |
Investment securities | 19,088 |  | 39,085
Recurring basis | Significant Other Observable Inputs (Level 2) |  |  |
Assets |  |  |
Restricted cash | 5,926 |  | 4,434
Total assets | 82,936 |  | 28,728
Recurring basis | Significant Other Observable Inputs (Level 2) | Wealth management products |  |  |
Assets |  |  |
Short-term investments | ¥ 77,010 |  | ¥ 24,294

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