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PRINCIPAL ACCOUNTING POLICIES - Dividends (Details) - CNY (¥) ¥ in Billions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
PRINCIPAL ACCOUNTING POLICIES
Restricted net assets of company's PRC subsidiaries and VIEs not distributable in form of dividends to parent	¥ 6.2
Accumulated profit of subsidiaries in PRC distributable in form of dividends to parent	¥ 32.0	¥ 28.4	¥ 25.8
Withholding tax rate for dividends distributed by foreign invested enterprise to their immediate holding companies outside mainland china (as a percent)	10.00%
Dividends declared and paid	¥ 0.0	¥ 0.0	¥ 0.0

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Amount of restricted net assets that may be distributed to the parent.

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Amount of restricted net assets that may not be distributed to the parent.

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Withholding Tax Rate for Dividends Distributed by Foreign Invested Enterprise to Their Immediate Holding Companies Outside Mainland China

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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