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GOODWILL (Tables) | 12 Months Ended
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Dec. 31, 2020
GOODWILL. |
Schedule of changes in the carrying amount of goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Gross |  | Accumulated |  | Net
​ | ​ | Amount | ​ | Impairment Loss | ​ | Amount
Balance at January 1, 2019 |  | 2,634 |  | (4) |  | 2,630
Increase in goodwill related to acquisitions |  | 27 |  | — |  | 27
Balance at December 31, 2019 |  | 2,661 |  | (4) |  | 2,657
Increase in goodwill related to acquisitions |  | 2,697 |  | — |  | 2,697
Impairment losses recognized | ​ | — | ​ | (437) | ​ | (437)
Net foreign exchange | ​ | 74 | ​ | (3) | ​ | 71
Balance at December 31, 2020 |  | 5,432 |  | (444) |  | 4,988
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Legacy |  | Legacy |  | ​
​ | ​ | Huazhu(1) | ​ | DH(2) | ​ | Total
Goodwill as of December 31, 2019 |  | 2,657 |  | — |  | 2,657
Goodwill as of December 31, 2020 |  | 2,660 |  | 2,328 |  | 4,988

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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