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BORROWINGS - Unused loan facilities (Parenthetical) (Details)
¥ in Thousands, $ in Thousands
Sep. 30, 2024
CNY (¥)
Sep. 30, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Debt Instrument      
Assets ¥ 29,925,430 $ 4,264,339 ¥ 30,385,903
Secured by property, equipment | Asset pledged as collateral      
Debt Instrument      
Assets 996,037    
Secured by land-use right | Asset pledged as collateral      
Debt Instrument      
Assets ¥ 217,975