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Long-term investments (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2024
USD ($)
Long-term investments          
Long-term investments ¥ 79   ¥ 211   $ 11
Impairment loss ¥ 132 $ 18 ¥ 8 ¥ 27