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GOODWILL - After acquisition of DH (Details) ¥ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 CNY (¥) item | Dec. 31, 2019 CNY (¥) item segment | Dec. 31, 2020 USD ($) | Dec. 31, 2018 CNY (¥)
Goodwill [Line Items] |  |  |  |
Goodwill | ¥ 4,988 | ¥ 2,657 | $ 764 | ¥ 2,630
Gross carrying values | 5,432 | 2,661 |  | 2,634
Accumulated impairment losses | ¥ 444 | ¥ 4 |  | ¥ 4
Number of reporting units | item | 2 | 1 |  |
legacy Huazhu |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | ¥ 2,660 | ¥ 2,657 |  |
Gross carrying values | 2,664 | 2,661 |  |
Accumulated impairment losses | 4 | ¥ 4 |  |
Number of reporting units | segment |  | 1 |  |
legacy DH |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 2,328 |  |  |
Accumulated impairment losses | ¥ 440 |  |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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