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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - CNY (¥)
¥ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts of accounts receivables and other receivables:      
Valuation And Qualifying Accounts      
Balance at Beginning of Year ¥ 22 ¥ 17 ¥ 11
Charge to Costs and Expenses 65 21 10
Charge to Other Accounts 7    
Addition Due to Acquisition     4
Write off (7) (16) (8)
Balance at End of Year 87 22 17
Valuation allowance for deferred tax assets      
Valuation And Qualifying Accounts      
Balance at Beginning of Year 152 107 123
Charge to Costs and Expenses 249 79 36
Charge Taken Against Allowance (32) (24) (43)
Write off   (10) (9)
Balance at End of Year ¥ 369 ¥ 152 ¥ 107