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REVENUE FROM CONTRACT WITH CUSTOMERS - Contract Balances (Details)
¥ in Millions, $ in Millions
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Contract with Customer, Liability [Abstract]      
Current contract liabilities ¥ 1,272 $ 195 ¥ 1,179
Long-term contract liabilities 662 $ 101 559
Total contract liabilities ¥ 1,934   ¥ 1,738