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Long-term assets - E.1.3. Movement in intangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net $ 7,558 $ 3,403
Change in scope   4,384
Additions 345 164
Amortization charge (345) (320)
Impairment (6) (1)
Disposals, net (9) (1)
Transfers to/from assets held for sale (57)  
Transfers 24 49
Exchange rate movements (147) (121)
Closing balance, net 7,361 7,558
Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 4,098 1,659
Change in scope   2,472
Additions 0 0
Impairment 0 0
Disposals, net 0 0
Transfers to/from assets held for sale (12)  
Transfers 0 0
Exchange rate movements (26) (33)
Closing balance, net 4,059 4,098
Licenses    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 1,120 870
Change in scope   370
Additions 195 29
Amortization charge (96) (82)
Impairment 0 0
Disposals, net (9) 0
Transfers to/from assets held for sale (18)  
Transfers (7) 0
Exchange rate movements (91) (67)
Closing balance, net 1,094 1,120
Customer Lists    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 970 423
Change in scope   605
Additions 0 0
Amortization charge (106) (56)
Impairment 0 0
Disposals, net 0 0
Transfers to/from assets held for sale 0  
Transfers 0 0
Exchange rate movements 0 (1)
Closing balance, net 864 970
IRUs    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 71 86
Change in scope   2
Additions 1 0
Amortization charge (14) (14)
Impairment 0 0
Disposals, net 0 0
Transfers to/from assets held for sale (17)  
Transfers 3 2
Exchange rate movements (4) (5)
Closing balance, net 40 71
Trademark    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 920 77
Change in scope   910
Additions 0 0
Amortization charge (1) (67)
Impairment 0 0
Disposals, net 0 0
Transfers to/from assets held for sale (10)  
Transfers 0 1
Exchange rate movements 0 0
Closing balance, net 910 920
Other    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 379 289
Change in scope   25
Additions 150 135
Amortization charge (130) (100)
Impairment (6) (1)
Disposals, net 0 (1)
Transfers to/from assets held for sale (2)  
Transfers 28 46
Exchange rate movements (25) (15)
Closing balance, net 394 379
Settlement provision 7  
Impairment charges 12  
Cost or valuation    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 9,602  
Closing balance, net 9,573 9,602
Cost or valuation | Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 4,098  
Closing balance, net 4,059 4,098
Cost or valuation | Licenses    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 1,778  
Closing balance, net 1,786 1,778
Cost or valuation | Customer Lists    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 1,209  
Closing balance, net 1,199 1,209
Cost or valuation | IRUs    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 206  
Closing balance, net 158 206
Cost or valuation | Trademark    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 1,251  
Closing balance, net 1,237 1,251
Cost or valuation | Other    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 1,059  
Closing balance, net 1,133 1,059
Accumulated amortization and impairment    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (2,044)  
Closing balance, net (2,212) (2,044)
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    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (658)  
Closing balance, net (692) (658)
Accumulated amortization and impairment | Customer Lists    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (239)  
Closing balance, net (335) (239)
Accumulated amortization and impairment | IRUs    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (135)  
Closing balance, net (118) (135)
Accumulated amortization and impairment | Trademark    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (331)  
Closing balance, net (327) (331)
Accumulated amortization and impairment | Other    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (681)  
Closing balance, net $ (740) $ (681)