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Long-term assets - E.2.2. Movements in tangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net $ 2,847 $ 3,107
Change in scope 387 115
Additions 654 579
Impairments/reversal of impairment, net 2  
Disposals, net (84) (16)
Depreciation charge (710) (710)
Asset retirement obligations 49 27
Transfers (3) (26)
Transfer to/from held for sale   (122)
Exchange rate movements 85 (107)
Other 0  
Closing balance, net 3,226 2,847
Cost or valuation    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 9,803  
Closing balance, net 11,411 9,803
Accumulated depreciation and impairment    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net (6,956)  
Closing balance, net (8,185) (6,956)
Network Equipment    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 2,271 2,507
Change in scope 293 114
Additions 133 118
Impairments/reversal of impairment, net 2  
Disposals, net (81) (11)
Depreciation charge (669) (671)
Asset retirement obligations 46 23
Transfers 523 404
Transfer to/from held for sale   (122)
Exchange rate movements 68 (90)
Other 4  
Closing balance, net 2,591 2,271
Network Equipment | Cost or valuation    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 8,767  
Closing balance, net 10,175 8,767
Network Equipment | Accumulated depreciation and impairment    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net (6,496)  
Closing balance, net (7,584) (6,496)
Land and Buildings    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 171 162
Change in scope 25 0
Additions 1 23
Impairments/reversal of impairment, net 0  
Disposals, net 0 0
Depreciation charge (17) (16)
Asset retirement obligations 3 4
Transfers 5 5
Transfer to/from held for sale   0
Exchange rate movements 9 (8)
Other (4)  
Closing balance, net 194 171
Land and Buildings | Cost or valuation    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 328  
Closing balance, net 444 328
Land and Buildings | Accumulated depreciation and impairment    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net (157)  
Closing balance, net (250) (157)
Construction in Progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 370 394
Change in scope 55 1
Additions 508 433
Impairments/reversal of impairment, net 0  
Disposals, net (3) (5)
Depreciation charge 0 0
Asset retirement obligations 0 0
Transfers (561) (445)
Transfer to/from held for sale   0
Exchange rate movements 8 (8)
Other 0  
Closing balance, net 376 370
Construction in Progress | Cost or valuation    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 370  
Closing balance, net 376 370
Construction in Progress | Accumulated depreciation and impairment    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 0  
Closing balance, net 0 0
Other    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 35 44
Change in scope 14 0
Additions 12 5
Impairments/reversal of impairment, net (1)  
Disposals, net 0 0
Depreciation charge (25) (23)
Asset retirement obligations 0 0
Transfers 29 9
Transfer to/from held for sale   0
Exchange rate movements 0 0
Other 0  
Closing balance, net 65 35
Other | Cost or valuation    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 338  
Closing balance, net 416 338
Other | Accumulated depreciation and impairment    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net (303)  
Closing balance, net $ (351) $ (303)