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PRINCIPAL ACCOUNTING POLICIES - Summary Of Expected Allowance For Credit Losses (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for Credit Loss [Abstract]
Balance at beginning of year	¥ 13,089
Allowance for credit losses	24,045	13,089
Write-offs	(24,630)
Balance at end of year	¥ 12,504	¥ 13,089

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Allowance for credit losses.

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