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REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Balances - Contract liabilities (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Contract with Customer, Liability    
Total contract liabilities ¥ 2,136 ¥ 2,151
Revenue recognized ¥ 655 ¥ 613