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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances (Details)
¥ in Millions, $ in Millions
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Contract with Customer, Liability [Abstract]      
Current contract liabilities ¥ 1,366 $ 214 ¥ 1,272
Long-term contract liabilities 785 $ 123 662
Total contract liabilities ¥ 2,151   ¥ 1,934