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Concentration and risks (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Concentration and risks    
Foreign currency exchange appreciation (depreciation) rate 2.00% 8.00%
Currency convertibility risk    
Concentration and risks    
Cash and cash equivalents, restricted cash and short-term investments ¥ 172,383 ¥ 146,152