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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Intangible assets (Details) - CNY (¥) ¥ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Impairment loss on intangible assets			¥ 245
Legacy DH [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment loss on intangible assets	¥ 0	¥ 0
Minimum | Favorable lease agreements
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	1 year
Minimum | Unfavorable lease agreements
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	3 years
Maximum | Favorable lease agreements
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	20 years
Maximum | Unfavorable lease agreements
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	13 years

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

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