v3.26.1
INTANGIBLE ASSETS - Summary of the movement in the net book value of intangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Goodwill [abstract]      
Goodwill at beginning of period $ 338 $ 349  
Acquisitions 116    
Divestment and reclassification as held for sale (58)    
Translation and other adjustment 3 (17)  
Goodwill at end of period 399 338 $ 349
Intangible assets and goodwill [abstract]      
Balance at beginning of the period 1,510 1,619  
Acquisitions 174    
Additions 149 170  
Disposals (1) (5)  
Amortization (224) (199) (208)
Divestment and reclassification as held for sale (58) (12)  
Transfer and reclassification 4 4  
Translation adjustment (5) (67)  
Balance at end of the period 1,549 1,510 1,619
Telecommunication licenses, frequencies & permissions      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at beginning of period 903 1,026  
Acquisitions 0    
Additions 1 35  
Disposals 0 0  
Amortization charge for the year (132) (125)  
Divestment and reclassification as held for sale 0 (4)  
Transfer and reclassification (2) 0  
Translation adjustment (9) (29)  
Intangible assets excl. goodwill at end of period 761 903 1,026
Software      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at beginning of period 210 193  
Acquisitions 8    
Additions 125 52  
Disposals (1) (4)  
Amortization charge for the year (79) (63)  
Divestment and reclassification as held for sale 0 (8)  
Transfer and reclassification 22 58  
Translation adjustment 1 (18)  
Intangible assets excl. goodwill at end of period 286 210 193
Brands and trademarks      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at beginning of period 1 4  
Acquisitions 18    
Additions 0 0  
Disposals 0 0  
Amortization charge for the year (2) (2)  
Divestment and reclassification as held for sale 0 0  
Transfer and reclassification 1 0  
Translation adjustment 0 (1)  
Intangible assets excl. goodwill at end of period 18 1 4
Customer relationships      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at beginning of period 36 42  
Acquisitions 32    
Additions 0 2  
Disposals 0 0  
Amortization charge for the year (6) (6)  
Divestment and reclassification as held for sale 0 0  
Transfer and reclassification 0 0  
Translation adjustment (1) (2)  
Intangible assets excl. goodwill at end of period 61 36 42
Other intangible assets      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at beginning of period 22 5  
Acquisitions 0    
Additions 23 81  
Disposals 0 (1)  
Amortization charge for the year (5) (3)  
Divestment and reclassification as held for sale 0 0  
Transfer and reclassification (17) (60)  
Translation adjustment 1 0  
Intangible assets excl. goodwill at end of period 24 22 5
Goodwill      
Goodwill [abstract]      
Goodwill at beginning of period 338 349  
Acquisitions 116    
Additions 0 0  
Disposals 0 0  
Amortization charge for the year 0 0  
Divestment and reclassification as held for sale (58) 0  
Transfer and reclassification 0 6  
Translation and other adjustment 3 (17)  
Goodwill at end of period 399 $ 338 $ 349
Cost      
Intangible assets and goodwill [abstract]      
Balance at end of the period 4,250    
Cost | Telecommunication licenses, frequencies & permissions      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period 1,851    
Cost | Software      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period 783    
Cost | Brands and trademarks      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period 174    
Cost | Customer relationships      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period 279    
Cost | Other intangible assets      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period 41    
Cost | Goodwill      
Goodwill [abstract]      
Goodwill at end of period 1,122    
Accumulated depreciation and impairment      
Intangible assets and goodwill [abstract]      
Balance at end of the period (2,701)    
Accumulated depreciation and impairment | Telecommunication licenses, frequencies & permissions      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period (1,090)    
Accumulated depreciation and impairment | Software      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period (497)    
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 (218)    
Accumulated depreciation and impairment | Other intangible assets      
Intangible assets other than goodwill [abstract]      
Intangible assets excl. goodwill at end of period (17)    
Accumulated depreciation and impairment | Goodwill      
Goodwill [abstract]      
Goodwill at end of period $ (723)