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INCOME TAXES - Deferred income tax assets and liabilities (Details) - CNY (¥)
¥ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:      
Net loss carryforward ¥ 1,678 ¥ 1,271  
Deferred revenue 349 326  
Long-term assets 303 238  
Bad debt provision 59 40  
Accrued payroll 41 45  
Other accrued expenses   3  
Other accrued expenses (9)    
Share-based compensation 31 29  
Others 150 150  
Valuation allowance (731) (466) ¥ (369)
Total deferred tax assets 1,871 1,636  
Deferred tax liabilities:      
Fair value adjustment for Building, land use rights and identified intangible assets due to acquisition 1,596 1,596  
Others 40 31  
Total deferred tax liabilities 1,636 1,627  
Net deferred tax assets 235 9  
Analysis as:      
Deferred tax assets 1,093 862  
Deferred tax liabilities 858 853  
Net deferred tax assets 235 9  
Movement of the valuation allowance      
Balance at the beginning of the year (466) (369) (152)
Provided (338) (151) (249)
Reversed 41 37 32
Written off 32 17  
Balance at the end of the year ¥ (731) ¥ (466) ¥ (369)