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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Impairment of long-lived assets (Details) - CNY (¥) ¥ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES |  |
Long-lived asset impairment loss | ¥ 38 | ¥ 36
Impairment Long Lived Asset Held For Use Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag | true |

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