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Credit risk (Details)
¥ in Millions
Mar. 31, 2026
USD ($)
Mar. 31, 2026
CNY (¥)
Dec. 31, 2025
USD ($)
Credit risk [Line Items]      
Deposit insurance regulation amount $ 72,485 ¥ 0.5  
CHINA      
Credit risk [Line Items]      
Cash 5,214,957   $ 24,691
American or Cananda [Member]      
Credit risk [Line Items]      
Cash $ 0   $ 0