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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances - Unsatisfied performance obligations (Details) - CNY (¥)
¥ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred revenues related to unsatisfied performance obligations of loyalty program ¥ 53 ¥ 51
Deferred revenue related to initial fees 1,074 924
Deferred revenue related to membership fees 519 430
Deferred revenues related to advances received from customers, expected to recognize revenue in future periods ¥ 505 ¥ 529
Minimum    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining contract period 1 year  
Remaining membership life 1 year  
Maximum    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining contract period 10 years  
Remaining membership life 5 years  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred revenues related to unsatisfied performance obligations of loyalty program ¥ 53  
Deferred revenue, recognized as revenue, estimated period 2 years