SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Intangible assets (Details) ¥ in Millions	12 Months Ended
Dec. 31, 2021 CNY (¥) item	Dec. 31, 2020 CNY (¥)
Finite-Lived Intangible Assets [Line Items]
Franchise fee reduction offered to franchisee to since the COVID-19 outbreak	¥ 105	¥ 132
Legacy Huazhu [Member]
Finite-Lived Intangible Assets [Line Items]
Percentage of fair value exceeded the carrying value	100.00%	100.00%
Legacy DH [member]
Finite-Lived Intangible Assets [Line Items]
Fair value exceeded carrying value	¥ 421	¥ 244
Percentage of fair value exceeded the carrying value	13.00%	6.00%
Hypothetical decline in projected cash flow (as a percent)	5.00%	5.00%
Short term work compensation	¥ 197	¥ 244
Other Operating Income \| Legacy DH [member]
Finite-Lived Intangible Assets [Line Items]
Other grants recognized	¥ 765	17
Master brand agreement
Finite-Lived Intangible Assets [Line Items]
Initial term	70 years
Deutsche Hospitality
Finite-Lived Intangible Assets [Line Items]
Percentage of fair value exceeded the carrying value	6.00%
Deutsche Hospitality \| Legacy DH [member]
Finite-Lived Intangible Assets [Line Items]
Hypothetical goodwill impairment in 5% decline in projected cash flow	¥ 313	42
Hypothetical goodwill impairment in 5% increase in discount rate	¥ 359	¥ 175
Deutsche Hospitality \| Brand names
Finite-Lived Intangible Assets [Line Items]
Number of brand names acquired \| item	2
Deutsche Hospitality \| Brand name, one
Finite-Lived Intangible Assets [Line Items]
Fair value exceeded carrying value	¥ 82
Percentage of fair value exceeded the carrying value	13.00%
Hypothetical indefinite life intangible asset impairment in 5% increase in discount rate	¥ 48
Hypothetical indefinite life intangible asset impairment in 5% decrease in royalty saving rate	36
Deutsche Hospitality \| Brand name, two
Finite-Lived Intangible Assets [Line Items]
Fair value exceeded carrying value	¥ 57
Percentage of fair value exceeded the carrying value	14.00%
Hypothetical increase in discount rate	5.00%
Hypothetical decrease in royalty saving rate	5.00%
Hypothetical indefinite life intangible asset impairment in 5% increase in discount rate	¥ 33
Hypothetical indefinite life intangible asset impairment in 5% decrease in royalty saving rate	¥ 23
Deutsche Hospitality \| Trademarks
Finite-Lived Intangible Assets [Line Items]
Hypothetical increase in discount rate	5.00%
Hypothetical decrease in royalty saving rate	5.00%
Hypothetical indefinite life intangible asset impairment in 5% increase in discount rate	¥ 160
Hypothetical indefinite life intangible asset impairment in 5% decrease in royalty saving rate	120
Impairment loss recognized	¥ 160
Minimum \| Franchise or manachise agreements
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	10 years
Minimum \| Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	2 years
Minimum \| Favorable lease agreements
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	1 year
Minimum \| Purchased software
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	3 years
Minimum \| Unfavorable lease agreements
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	3 years
Minimum \| Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	2 years
Maximum \| Franchise or manachise agreements
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	20 years
Maximum \| Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	10 years
Maximum \| Favorable lease agreements
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	20 years
Maximum \| Purchased software
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	10 years
Maximum \| Unfavorable lease agreements
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	13 years
Maximum \| Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Remaining contract terms	15 years

The percentage of fair value exceeded the carrying value.

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Amount of fair value exceeded carrying value.

+ References

No definition available.

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- Definition

The amount of franchise fee reduction extended to franchise since the outbreak of COVID-19 to help franchisees meet their short-term working capital needs

+ References

No definition available.

+ Details

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- Definition

Period of the initial term of a contract.

+ References

No definition available.

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- Definition

The number of brand names acquired.

+ References

No definition available.

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Represents the amount of other grants recognized.

+ References

No definition available.

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- Definition

The hypothetical decrease in projected cash flow on the impairment test of goodwill as of the balance reporting date.

+ References

No definition available.

+ Details

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- Definition

The hypothetical financial impact of a 5 percent decrease of the underlying projected cash flow on the impairment test of goodwill as of the balance reporting date.

+ References

No definition available.

+ Details

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- Definition

The hypothetical financial impact of a 5 percent increase of the discount rate on the impairment test of goodwill as of the balance reporting date.

+ References

No definition available.

+ Details

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- Definition

The hypothetical financial impact of a 5 percent decrease of the royalty saving rate on the impairment test of indefinite intangible assets as of the balance reporting date.

+ References

No definition available.

+ Details

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- Definition

The hypothetical financial impact of a 5 percent decrease of the royalty saving rate on the impairment test of indefinite intangible assets as of the balance reporting date.

+ References

No definition available.

+ Details

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- Definition

The hypothetical increase in discount rate on the impairment test of indefinite life intangible assets, other than goodwill, as of the balance reporting date.

+ References

No definition available.

+ Details

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- Definition

The hypothetical financial impact of a 5 percent increase of the discount rate on the impairment test of indefinite life intangible assets, other than goodwill, as of the balance reporting date.

+ References

No definition available.

+ Details

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- Definition

Represents the amount of short term work compensation recognized.

+ References

No definition available.

+ Details

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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

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.

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- Definition

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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