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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 |  |

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- 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. + References No definition available. + Details
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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 + Details
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