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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Variable Interest Entities (Details) - item | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
VIEs |  |
Variable Interest Entities |  |
Number of entities consolidated | 7 | 8

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- Definition The number of entities included in consolidation. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Period Type: |