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ACQUISITIONS - Deutsche Hospitality (Details) - Deutsche Hospitality.
€ in Millions, ¥ in Millions
12 Months Ended
Jan. 02, 2020
EUR (€)
item
Jan. 02, 2020
CNY (¥)
item
Dec. 31, 2021
CNY (¥)
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 | item 5 5    
Aggregated consideration € 720 ¥ 5,624    
Net revenue of the acquiree included in the consolidated statements of comprehensive income     ¥ 184 ¥ 1,532
Net loss of the acquiree included in the consolidated statements of comprehensive income     ¥ 34 ¥ 1,345