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Long-term assets - E.1.3. Movement in intangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net $ 6,908 $ 7,785
Change in scope 546 114
Additions 572 221
Amortization charge (319) (319)
Impairment (4) (8)
Disposals, net (2) 1
Asset retirement obligation   1
Transfers 0 30
Transfer to/from held for sale (4) (870)
Exchange rate movements 102 (47)
Closing balance, net 7,798 6,908
Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 4,094 4,107
Change in scope 127 0
Additions 0 0
Amortization charge 0 0
Impairment 0 0
Disposals, net 0 0
Asset retirement obligation   0
Transfers 0 0
Transfer to/from held for sale 0 0
Exchange rate movements 44 (13)
Closing balance, net 4,265 4,094
Licenses and Spectrum    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 840 1,558
Change in scope 252 114
Additions 506 123
Amortization charge (91) (81)
Impairment 0 (3)
Disposals, net 0 2
Asset retirement obligation   1
Transfers 0 4
Transfer to/from held for sale (4) (861)
Exchange rate movements 46 (19)
Closing balance, net 1,548 840
Customer lists    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 679 769
Change in scope 163 0
Additions 0 0
Amortization charge (92) (92)
Impairment 0 0
Disposals, net 0 0
Asset retirement obligation   0
Transfers 0 0
Transfer to/from held for sale 0 0
Exchange rate movements 3 2
Closing balance, net 753 679
IRUs    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 25 33
Change in scope 0 0
Additions 0 1
Amortization charge (6) (9)
Impairment 0 0
Disposals, net 0 0
Asset retirement obligation   0
Transfers 1 3
Transfer to/from held for sale 0 0
Exchange rate movements 0 (2)
Closing balance, net 20 25
Trademarks    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 912 910
Change in scope 0 0
Additions 0 0
Amortization charge 0 0
Impairment 0 0
Disposals, net 0 0
Asset retirement obligation   0
Transfers 1 0
Transfer to/from held for sale 0 0
Exchange rate movements 3 2
Closing balance, net 915 912
Other    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 359 408
Change in scope 4 0
Additions 65 97
Amortization charge (129) (138)
Impairment (4) (5)
Disposals, net (2) (1)
Asset retirement obligation   0
Transfers (2) 24
Transfer to/from held for sale 0 (9)
Exchange rate movements 6 (16)
Closing balance, net 297 359
Computer software    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Impairment   (7)
Cost or valuation    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 9,611  
Closing balance, net 10,848 9,611
Cost or valuation | Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 4,094  
Closing balance, net 4,265 4,094
Cost or valuation | Licenses and Spectrum    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 1,594  
Closing balance, net 2,354 1,594
Cost or valuation | Customer lists    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 1,211  
Closing balance, net 1,381 1,211
Cost or valuation | IRUs    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 169  
Closing balance, net 178 169
Cost or valuation | Trademarks    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 1,240  
Closing balance, net 1,248 1,240
Cost or valuation | Other    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 1,302  
Closing balance, net 1,422 1,302
Accumulated amortization and impairment    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (2,703)  
Closing balance, net (3,050) (2,703)
Accumulated amortization and impairment | Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 0  
Closing balance, net 0 0
Accumulated amortization and impairment | Licenses and Spectrum    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (755)  
Closing balance, net (805) (755)
Accumulated amortization and impairment | Customer lists    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (533)  
Closing balance, net (628) (533)
Accumulated amortization and impairment | IRUs    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (144)  
Closing balance, net (158) (144)
Accumulated amortization and impairment | Trademarks    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (329)  
Closing balance, net (333) (329)
Accumulated amortization and impairment | Other    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (943)  
Closing balance, net $ (1,125) $ (943)