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TAXATION - Effect of tax holiday (Details) - CNY (¥)
¥ / shares in Units, ¥ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income tax holiday      
Tax holiday effect ¥ 183 ¥ 359 ¥ 370
ADS      
Income tax holiday      
Basic net income per ADS effect (in RMB per share) ¥ 0.28 ¥ 0.57 ¥ 0.62
Diluted net income per ADS effect (in RMB per share) ¥ 0.28 ¥ 0.57 ¥ 0.62