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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances (Details)
¥ in Millions, $ in Millions
Jun. 30, 2024
CNY (¥)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Contract with Customer, Liability      
Current contract liabilities ¥ 1,760 $ 242 ¥ 1,637
Long-term contract liabilities 1,182 $ 163 1,072
Total contract liabilities ¥ 2,942   ¥ 2,709