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Long-term assets - E.3 Leases (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Right-of-Use Assets [Roll Forward]  
Opening balance, net $ 0
Change in scope 177
Additions 102
Modifications 11
Impairments (1)
Disposals (10)
Depreciation (141)
Transfers 1
Transfers to/from assets held for sale (9)
Exchange rate movements (10)
Closing balance, net 977
Land and buildings  
Right-of-Use Assets [Roll Forward]  
Change in scope 0
Additions 25
Modifications 6
Impairments (1)
Disposals (4)
Depreciation (35)
Transfers 0
Transfers to/from assets held for sale (1)
Exchange rate movements 0
Closing balance, net 145
Sites rental  
Right-of-Use Assets [Roll Forward]  
Change in scope 43
Additions 4
Modifications (2)
Impairments 0
Disposals (4)
Depreciation (16)
Transfers 0
Transfers to/from assets held for sale (5)
Exchange rate movements (2)
Closing balance, net 87
Tower rental  
Right-of-Use Assets [Roll Forward]  
Change in scope 121
Additions 67
Modifications 7
Impairments 0
Disposals (1)
Depreciation (86)
Transfers 1
Transfers to/from assets held for sale (3)
Exchange rate movements (7)
Closing balance, net 720
Other network equipment  
Right-of-Use Assets [Roll Forward]  
Change in scope 1
Additions 1
Modifications 0
Impairments 0
Disposals 0
Depreciation (2)
Transfers 0
Transfers to/from assets held for sale 0
Exchange rate movements 0
Closing balance, net 8
Capacity  
Right-of-Use Assets [Roll Forward]  
Change in scope 12
Additions 2
Modifications 0
Impairments 0
Disposals 0
Depreciation 0
Transfers 0
Transfers to/from assets held for sale 0
Exchange rate movements 0
Closing balance, net 14
Other  
Right-of-Use Assets [Roll Forward]  
Change in scope 0
Additions 1
Modifications 0
Impairments 0
Disposals 0
Depreciation (2)
Transfers 0
Transfers to/from assets held for sale 0
Exchange rate movements 0
Closing balance, net 3
Cost or valuation  
Right-of-Use Assets [Roll Forward]  
Closing balance, net 1,216
Cost or valuation | Land and buildings  
Right-of-Use Assets [Roll Forward]  
Closing balance, net 177
Cost or valuation | Sites rental  
Right-of-Use Assets [Roll Forward]  
Closing balance, net 103
Cost or valuation | Tower rental  
Right-of-Use Assets [Roll Forward]  
Closing balance, net 900
Cost or valuation | Other network equipment  
Right-of-Use Assets [Roll Forward]  
Closing balance, net 11
Cost or valuation | Capacity  
Right-of-Use Assets [Roll Forward]  
Closing balance, net 16
Cost or valuation | Other  
Right-of-Use Assets [Roll Forward]  
Closing balance, net 8
Accumulated depreciation and impairment  
Right-of-Use Assets [Roll Forward]  
Closing balance, net (238)
Accumulated depreciation and impairment | Land and buildings  
Right-of-Use Assets [Roll Forward]  
Closing balance, net (32)
Accumulated depreciation and impairment | Sites rental  
Right-of-Use Assets [Roll Forward]  
Closing balance, net (16)
Accumulated depreciation and impairment | Tower rental  
Right-of-Use Assets [Roll Forward]  
Closing balance, net (180)
Accumulated depreciation and impairment | Other network equipment  
Right-of-Use Assets [Roll Forward]  
Closing balance, net (3)
Accumulated depreciation and impairment | Capacity  
Right-of-Use Assets [Roll Forward]  
Closing balance, net (2)
Accumulated depreciation and impairment | Other  
Right-of-Use Assets [Roll Forward]  
Closing balance, net (5)
Increase (decrease) due to application of IFRS 16  
Right-of-Use Assets [Roll Forward]  
Opening balance, net 856
Increase (decrease) due to application of IFRS 16 | Land and buildings  
Right-of-Use Assets [Roll Forward]  
Opening balance, net 154
Increase (decrease) due to application of IFRS 16 | Sites rental  
Right-of-Use Assets [Roll Forward]  
Opening balance, net 67
Increase (decrease) due to application of IFRS 16 | Tower rental  
Right-of-Use Assets [Roll Forward]  
Opening balance, net 623
Increase (decrease) due to application of IFRS 16 | Other network equipment  
Right-of-Use Assets [Roll Forward]  
Opening balance, net 9
Increase (decrease) due to application of IFRS 16 | Capacity  
Right-of-Use Assets [Roll Forward]  
Opening balance, net 0
Increase (decrease) due to application of IFRS 16 | Other  
Right-of-Use Assets [Roll Forward]  
Opening balance, net $ 4