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ACQUISITIONS - Crystal Orange & Blossom Hotel management (Details) ¥ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 CNY (¥) | Aug. 31, 2018 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Business acquisition, pro forma information |  |  |  |  |  |
Cash consideration to noncontrolling interests |  |  | ¥ 98 | $ 16 | ¥ 39 | ¥ 84
Blossom Hotel Management |  |  |  |  |  |
Acquisitions |  |  |  |  |  |
Percentage of ownership interest acquired |  | 83.00% |  |  |  |
Aggregated consideration |  | ¥ 536 |  |  |  |
Cash consideration |  | 463 |  |  |  |
Implied fair value of equity interests |  | ¥ 73 |  |  |  |
Percentage of equity interests transferred |  | 11.00% |  |  |  |
Gain on remeasurement |  | ¥ 13 |  |  |  |
Business acquisition, pro forma information |  |  |  |  |  |
Percentage of noncontrolling interest acquired | 5.00% | 11.00% |  |  |  |
Cash consideration to noncontrolling interests | ¥ 34 | ¥ 73 |  |  |  |
Percent of equity interest owned in total |  |  | 99.00% | 99.00% |  |

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