v3.26.1
Expenses by nature - Summary of Expense By Nature (Parenthetical) (Details) - CNY (¥)
¥ in Millions
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Disclosure Expense By Nature [Abstract]    
Research and development expense ¥ 1,180 ¥ 1,140
Employee benefits expenses for research and development ¥ 1,094 ¥ 1,055