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GOODWILL - KEY ASSUMPTIONS USED FOR VALUE-IN-USE CALCULATIONS (Details) - CNY (¥)
¥ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of goodwill key assumptions used for value-in-use calculation [line items]    
Period over which management has projected cash flows P5Y  
Amount by which unit's recoverable amount exceeds its carrying amount ¥ 3,495 ¥ 3,937
Maximum [member]    
Disclosure of goodwill key assumptions used for value-in-use calculation [line items]    
Period over which management expect Group's business recover from impact of COVID-19 epidemic 2 years  
Minimum [member]    
Disclosure of goodwill key assumptions used for value-in-use calculation [line items]    
Period over which management expect Group's business recover from impact of COVID-19 epidemic 1 year  
Railroad business [member]    
Disclosure of goodwill key assumptions used for value-in-use calculation [line items]    
Long-term growth rate (beyond the five-years period) 3.00% 3.00%
Pre-tax discount rate 12.00% 12.00%
Railroad business [member] | Maximum [member]    
Disclosure of goodwill key assumptions used for value-in-use calculation [line items]    
Revenue growth rate (within the five-year period) 10.00% 32.00%
Gross margin 7.00% 8.00%
Railroad business [member] | Minimum [member]    
Disclosure of goodwill key assumptions used for value-in-use calculation [line items]    
Revenue growth rate (within the five-year period) 6.00% 8.00%
Gross margin (1.00%) 3.00%