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SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) - CNY (¥)
¥ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts of accounts receivables and other receivables:      
Valuation And Qualifying Accounts      
Balance at Beginning of Year ¥ 87 ¥ 22 ¥ 17
Charge to Costs and Expenses 105 65 21
Charge to Other Accounts   7  
Write off (64) (7) (16)
Balance at End of Year 128 87 22
Valuation allowance for deferred tax assets      
Valuation And Qualifying Accounts      
Balance at Beginning of Year 369 152 107
Charge to Costs and Expenses 151 249 79
Charge Taken Against Allowance (37) (32) (24)
Write off (17)   (10)
Balance at End of Year ¥ 466 ¥ 369 ¥ 152