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PROPERTY AND EQUIPMENT - Movement in right-of-use assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets at beginning of period $ 821 $ 706
Additions 200 318
Disposals (12) (28)
Depreciation charge for the year (155) (146)
Divestment and reclassification as held for sale (7)  
Impairment (1)  
Impairment reversal 1 2
Transfers (10) 0
Modifications and reassessments 84 29
Translation adjustment (60) (60)
Right-of-use assets at end of period 861 821
Cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets at end of period 1,370  
Accumulated depreciation and impairment    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets at end of period (509)  
Telecommunication equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets at beginning of period 747 661
Additions 167 271
Disposals (8) (25)
Depreciation charge for the year (133) (131)
Divestment and reclassification as held for sale (4)  
Impairment (1)  
Impairment reversal 1 2
Transfers (9) 1
Modifications and reassessments 69 25
Translation adjustment (53) (57)
Right-of-use assets at end of period 776 747
Telecommunication equipment | Cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets at end of period 1,234  
Telecommunication equipment | Accumulated depreciation and impairment    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets at end of period (458)  
Land, buildings and constructions    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets at beginning of period 61 44
Additions 23 32
Disposals (4) (3)
Depreciation charge for the year (17) (13)
Divestment and reclassification as held for sale (3)  
Impairment 0  
Impairment reversal 0 0
Transfers (1) (1)
Modifications and reassessments 15 5
Translation adjustment (6) (3)
Right-of-use assets at end of period 68 61
Land, buildings and constructions | Cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets at end of period 111  
Land, buildings and constructions | Accumulated depreciation and impairment    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets at end of period (43)  
Office and other equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets at beginning of period 13 1
Additions 10 15
Disposals 0 0
Depreciation charge for the year (5) (2)
Divestment and reclassification as held for sale 0  
Impairment 0  
Impairment reversal 0 0
Transfers 0 0
Modifications and reassessments 0 (1)
Translation adjustment (1) 0
Right-of-use assets at end of period 17 $ 13
Office and other equipment | Cost    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets at end of period 25  
Office and other equipment | Accumulated depreciation and impairment    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets at end of period $ (8)