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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances (Details)
¥ in Millions, $ in Millions
Sep. 30, 2022
CNY (¥)
Sep. 30, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Contract with Customer, Liability      
Current contract liabilities ¥ 1,280 $ 180 ¥ 1,366
Long-term contract liabilities 822 $ 116 785
Total contract liabilities ¥ 2,102   ¥ 2,151