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ACQUISITIONS - Deutsche Hospitality (Details) - Deutsche Hospitality
€ in Millions
12 Months Ended
Jan. 02, 2020
CNY (¥)
Jan. 02, 2020
EUR (€)
Dec. 31, 2020
CNY (¥)
Business Acquisition [Line Items]      
Percentage of ownership interest acquired 100.00% 100.00%  
Number of brands in which entity is operating 5    
Aggregated consideration ¥ 5,624,000 € 720  
Net revenue of the acquiree included in the consolidated statements of comprehensive income     ¥ 1,532,000,000
Net loss of the acquiree included in the consolidated statements of comprehensive income     ¥ 1,345,000,000