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INTANGIBLE ASSETS - Summary of the movement in the net book value of intangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill [abstract]      
Goodwill at beginning of period $ 349 $ 394  
Translation adjustment (17) (45)  
Goodwill at end of period 338 349 $ 394
Intangible assets and goodwill [abstract]      
Balance at beginning of the period 1,619 1,960  
Additions 170 101  
Disposals (5)    
Amortization (199) (208) (221)
Divestment and reclassification as held for sale (12)    
Transfer and reclassification 4 5  
Translation adjustment (67) (239)  
Balance at end of the period 1,510 1,619 1,960
Telecommunication licenses, frequencies & permissions      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at beginning of period 1,026 1,334  
Additions 35 4  
Disposals, intangible assets other than goodwill 0    
Amortization charge for the year (125) (131)  
Divestment and reclassification as held for sale (4)    
Transfer and reclassification 0 (1)  
Translation adjustment (29) (180)  
Intangible assets excl. goodwill at end of period 903 1,026 1,334
Software      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at beginning of period 193 169  
Additions 52 92  
Disposals, intangible assets other than goodwill (4)    
Amortization charge for the year (63) (67)  
Divestment and reclassification as held for sale (8)    
Transfer and reclassification 58 7  
Translation adjustment (18) (8)  
Intangible assets excl. goodwill at end of period 210 193 169
Brands and trademarks      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at beginning of period 4 7  
Additions 0 0  
Disposals, intangible assets other than goodwill 0    
Amortization charge for the year (2) (3)  
Divestment and reclassification as held for sale 0    
Transfer and reclassification 0 0  
Translation adjustment (1) 0  
Intangible assets excl. goodwill at end of period 1 4 7
Customer relationships      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at beginning of period 42 54  
Additions 2 0  
Disposals, intangible assets other than goodwill 0    
Amortization charge for the year (6) (6)  
Divestment and reclassification as held for sale 0    
Transfer and reclassification 0 0  
Translation adjustment (2) (6)  
Intangible assets excl. goodwill at end of period 36 42 54
Other intangible assets      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at beginning of period 5 2  
Additions 81 5  
Disposals, intangible assets other than goodwill (1)    
Amortization charge for the year (3) (1)  
Divestment and reclassification as held for sale 0    
Transfer and reclassification (60) (1)  
Translation adjustment 0 0  
Intangible assets excl. goodwill at end of period 22 5 2
Goodwill [member]      
Goodwill [abstract]      
Goodwill at beginning of period 349 394  
Additional recognition, goodwill 0 0  
Divestment and reclassification as held for sale 0    
Amortization charge for the year 0 0  
Divestment and reclassification as held for sale 0    
Transfer and reclassification 6 0  
Translation adjustment (17) (45)  
Goodwill at end of period 338 $ 349 $ 394
Cost      
Intangible assets and goodwill [abstract]      
Balance at end of the period 4,057    
Cost | Telecommunication licenses, frequencies & permissions      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period 1,865    
Cost | Software      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period 658    
Cost | Brands and trademarks      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period 157    
Cost | Customer relationships      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period 277    
Cost | Other intangible assets      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period 33    
Cost | Goodwill [member]      
Goodwill [abstract]      
Goodwill at end of period 1,067    
Accumulated depreciation and impairment      
Intangible assets and goodwill [abstract]      
Balance at end of the period (2,547)    
Accumulated depreciation and impairment | Telecommunication licenses, frequencies & permissions      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period (962)    
Accumulated depreciation and impairment | Software      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period (448)    
Accumulated depreciation and impairment | Brands and trademarks      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period (156)    
Accumulated depreciation and impairment | Customer relationships      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period (241)    
Accumulated depreciation and impairment | Other intangible assets      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period (11)    
Accumulated depreciation and impairment | Goodwill [member]      
Goodwill [abstract]      
Goodwill at end of period $ (729)