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INVESTMENTS - Equity securities without readily determinable fair values (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Equity securities without readily determinable fair values      
Carrying value of equity securities without readily determinable fair values ¥ 551 ¥ 604  
Total consideration 0 15 ¥ 30
Gain/(loss) on sale of equity securities without readily determinable fair values 0 (4) 1
Investment in equity securities without readily determinable fair value ¥ 10 ¥ 45 ¥ 94