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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

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