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ACQUISITIONS - Deutsche Hospitality, Unaudited proforma results of operations (Details) - Deutsche Hospitality - CNY (¥) ¥ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Pro forma results of operation |  |
Pro forma total revenue | ¥ 10,196 | ¥ 14,995
Pro forma net income (loss) | ¥ (2,204) | 1,780
Transaction cost |  | ¥ 70

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