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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

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