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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances (Details)
¥ in Millions, $ in Millions
Jun. 30, 2023
CNY (¥)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Contract with Customer, Liability      
Current contract liabilities ¥ 1,413 $ 195 ¥ 1,308
Long-term contract liabilities 936 $ 129 828
Total contract liabilities ¥ 2,349   ¥ 2,136