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Long-term assets - E.2.2. Movements in tangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net $ 2,899 [1] $ 2,764
Change in scope   272
Additions 649 719
Impairments/reversal of impairment, net   1
Disposals, net (13) (19)
Depreciation charge (749) (711)
Asset retirement obligations 19 19
Transfers 24 (24)
Transfers from/(to) assets held for sale 3 (88)
Exchange rate movements (77) (34)
Closing balance, net 2,755 2,899 [1]
Cost or valuation    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 7,851  
Closing balance, net 7,466 7,851
Accumulated amortization and impairment    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net (4,952)  
Closing balance, net (4,711) (4,952)
Networks (including civil works)    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 2,212 2,149
Change in scope   201
Additions 31 87
Impairments/reversal of impairment, net   0
Disposals, net 31 (8)
Depreciation charge (644) (588)
Asset retirement obligations 17 14
Transfers 588 444
Transfers from/(to) assets held for sale 1 (61)
Exchange rate movements (62) (25)
Closing balance, net 2,175 2,212
Networks (including civil works) | Cost or valuation    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 6,655  
Closing balance, net 6,423 6,655
Networks (including civil works) | Accumulated amortization and impairment    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net (4,443)  
Closing balance, net (4,248) (4,443)
Land and Buildings    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 206 175
Change in scope   48
Additions 0 4
Impairments/reversal of impairment, net   0
Disposals, net (2) (1)
Depreciation charge (22) (13)
Asset retirement obligations 2 5
Transfers 5 4
Transfers from/(to) assets held for sale 1 (14)
Exchange rate movements (5) (2)
Closing balance, net 185 206
Land and Buildings | Cost or valuation    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 364  
Closing balance, net 329 364
Land and Buildings | Accumulated amortization and impairment    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net (158)  
Closing balance, net (144) (158)
Construction in Progress    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 355 284
Change in scope   14
Additions 606 612
Impairments/reversal of impairment, net   0
Disposals, net (2) (6)
Depreciation charge 0 0
Asset retirement obligations 0 0
Transfers (644) (537)
Transfers from/(to) assets held for sale 0 (7)
Exchange rate movements (7) (6)
Closing balance, net 308 355
Construction in Progress | Cost or valuation    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 355  
Closing balance, net 308 355
Construction in Progress | Accumulated amortization 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 127 156
Change in scope   9
Additions 11 16
Impairments/reversal of impairment, net   1
Disposals, net (41) (3)
Depreciation charge (83) (110)
Asset retirement obligations 0 0
Transfers 75 64
Transfers from/(to) assets held for sale 0 (5)
Exchange rate movements (2) (1)
Closing balance, net 87 127
Other | Cost or valuation    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net 477  
Closing balance, net 407 477
Other | Accumulated amortization and impairment    
Reconciliation of changes in property, plant and equipment [abstract]    
Opening balance, net (351)  
Closing balance, net $ (320) $ (351)
[1] The consolidated statement of financial position at December 31, 2019 has been restated after finalization of the purchase accounting of our acquisitions in Nicaragua and Panama (note A.1.2.).