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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Impairment of long-lived assets (Details) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES
Long-lived asset impairment loss	¥ 89	¥ 286	¥ 297
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Impairment Long Lived Asset Held For Use Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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