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Loan facilities and lines of credit (Details 3) - Line of Credit [Member]
¥ in Millions
Dec. 31, 2022
CNY (¥)
Debt Instrument [Line Items]  
2023 ¥ 885
2024 1,367
2025 3,360
2026 2,109
2027 7,619
2028 and thereafter 5,554
Total ¥ 20,894