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Expenses by nature - Summary of Expense By Nature (Parenthetical) (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure Expense By Nature [Abstract]      
Research and development expense ¥ 2,317 ¥ 2,280 ¥ 2,525
Employee benefits expenses for research and development ¥ 2,144 ¥ 2,084 ¥ 2,303