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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Investments, Loan receivables and Inventories (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Investments      
Impairment loss ¥ 63 ¥ 92 ¥ 10
Inventories      
Estimated useful life of small appliances and bedding 1 year    
Minimum | Certain franchisees      
Loan receivables      
Term of loan agreement 2 years    
Interest rate (as a percent) 8.00%    
Minimum | Un-related third-parties      
Loan receivables      
Interest rate (as a percent) 4.80%    
Maximum | Certain franchisees      
Loan receivables      
Term of loan agreement 3 years    
Interest rate (as a percent) 8.50%    
Maximum | Un-related third-parties      
Loan receivables      
Interest rate (as a percent) 15.00%