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Long-term assets - E.1.3. Movement in intangible assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net $ 1,265 $ 1,359
Change in scope 1,185 20
Additions 158 130
Amortization charge (144) (153)
Impairment (6) (15)
Disposals, net 0 (1)
Transfers (16) (19)
Transfers to/from assets held for sale (12) (64)
Exchange rate movements (55) 9
Closing balance, net 2,374 1,265
Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 599 615
Change in scope 512 3
Additions 0 0
Amortization charge   0
Impairment (6) (7)
Disposals, net 0 0
Transfers 0 (2)
Transfers to/from assets held for sale 0 (8)
Exchange rate movements (28) (1)
Closing balance, net 1,077 599
Licenses    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 324 380
Change in scope 0 0
Additions 66 40
Amortization charge (48) (49)
Impairment 0 (8)
Disposals, net 0 0
Transfers 0 3
Transfers to/from assets held for sale (12) (50)
Exchange rate movements (12) 7
Closing balance, net 318 324
Customer lists    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 33 32
Change in scope 370 15
Additions 0 0
Amortization charge (11) (15)
Impairment 0 0
Disposals, net 0 0
Transfers 0 0
Transfers to/from assets held for sale 0 (1)
Exchange rate movements (1) 1
Closing balance, net 391 33
IRUs    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 105 114
Change in scope 0 0
Additions 2 (2)
Amortization charge (14) (14)
Impairment 0 0
Disposals, net 0 0
Transfers 0 8
Transfers to/from assets held for sale 0 0
Exchange rate movements (5) 0
Closing balance, net 89 105
Trademarks    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 10 18
Change in scope 280 0
Additions 0 0
Amortization charge (8) (8)
Impairment 0 0
Disposals, net 0 0
Transfers 0 0
Transfers to/from assets held for sale 0 0
Exchange rate movements 0 0
Closing balance, net 282 10
Other    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 194 200
Change in scope 23 1
Additions 91 92
Amortization charge (65) (67)
Impairment 0 0
Disposals, net 0 (1)
Transfers (16) (28)
Transfers to/from assets held for sale 0 (5)
Exchange rate movements (9) 2
Closing balance, net 218 194
Cost or valuation    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 2,288  
Closing balance, net 3,451 2,288
Cost or valuation | Goodwill    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 599  
Closing balance, net 1,077 599
Cost or valuation | Licenses    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 650  
Closing balance, net 646 650
Cost or valuation | Customer lists    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 225  
Closing balance, net 581 225
Cost or valuation | IRUs    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 181  
Closing balance, net 176 181
Cost or valuation | Trademarks    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 49  
Closing balance, net 325 49
Cost or valuation | Other    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net 584  
Closing balance, net 646 584
Accumulated amortization and impairment    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (1,022)  
Closing balance, net (1,077) (1,022)
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 (327)  
Closing balance, net (328) (327)
Accumulated amortization and impairment | Customer lists    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (192)  
Closing balance, net (190) (192)
Accumulated amortization and impairment | IRUs    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (76)  
Closing balance, net (87) (76)
Accumulated amortization and impairment | Trademarks    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (39)  
Closing balance, net (43) (39)
Accumulated amortization and impairment | Other    
Reconciliation of changes in intangible assets and goodwill [abstract]    
Opening balance, net (389)  
Closing balance, net $ (428) $ (389)