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Long-term assets - E.3 Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Right-of-Use Assets [Roll Forward]      
Opening balance, net $ 895    
Change in scope (see note A.1.2.) 187 $ 0  
Additions 106 86  
Modifications 25 (8)  
Impairments (1) (1)  
Disposals (7) (12)  
Depreciation (145) (155)  
Asset retirement obligations 0 0  
Transfers (18) 4  
Transfers to/from assets held for sale   0  
Exchange rate movements (34) (32)  
Closing balance, net 1,008 [1] 895  
Gains or losses arising from sale and leaseback transactions 0 0 $ 5
Income from tower deal transactions 0 0 22
Colombia      
Right-of-Use Assets [Roll Forward]      
Decrease in lease liabilities 45    
Decrease in right-of-use assets 45    
Land and buildings      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 147    
Change in scope (see note A.1.2.) 16 0  
Additions 37 41  
Modifications 14 9  
Impairments (1) (1)  
Disposals (2) (10)  
Depreciation (36) (38)  
Asset retirement obligations 1 0  
Transfers 0 0  
Transfers to/from assets held for sale   0  
Exchange rate movements (9) (3)  
Closing balance, net 169 147  
Sites rental      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 93    
Change in scope (see note A.1.2.) 107 0  
Additions 14 2  
Modifications 8 10  
Impairments 0 0  
Disposals (2) (1)  
Depreciation (22) (17)  
Asset retirement obligations 0 1  
Transfers 4 0  
Transfers to/from assets held for sale   0  
Exchange rate movements (1) (2)  
Closing balance, net 201 93  
Tower rental      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 607    
Change in scope (see note A.1.2.) 48 0  
Additions 53 23  
Modifications 3 (27)  
Impairments 0 0  
Disposals (2) 0  
Depreciation (81) (88)  
Asset retirement obligations 0 0  
Transfers (17) (2)  
Transfers to/from assets held for sale   0  
Exchange rate movements (24) (27)  
Closing balance, net 587 607  
Other network equipment      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 14    
Change in scope (see note A.1.2.) 3 0  
Additions 0 1  
Modifications 1 0  
Impairments 0 0  
Disposals (1) 0  
Depreciation (4) (1)  
Asset retirement obligations 0 0  
Transfers (5) 0  
Transfers to/from assets held for sale   0  
Exchange rate movements 0 0  
Closing balance, net 25 14  
Capacity      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 31    
Change in scope (see note A.1.2.) 0 0  
Additions 0 18  
Modifications 0 (1)  
Impairments 0 0  
Disposals 0 (1)  
Depreciation (1) (8)  
Asset retirement obligations 0 0  
Transfers (1) 5  
Transfers to/from assets held for sale   0  
Exchange rate movements 0 0  
Closing balance, net 12 31  
Other      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 2    
Change in scope (see note A.1.2.) 13 0  
Additions 1 1  
Modifications (1) 0  
Impairments 0 0  
Disposals 0 0  
Depreciation (2) (2)  
Asset retirement obligations 0 (1)  
Transfers 0 1  
Transfers to/from assets held for sale   0  
Exchange rate movements 0 0  
Closing balance, net 13 2  
Cost or valuation      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 1,238    
Closing balance, net 1,557 1,238  
Cost or valuation | Land and buildings      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 206    
Closing balance, net 254 206  
Cost or valuation | Sites rental      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 127    
Closing balance, net 317 127  
Cost or valuation | Tower rental      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 839    
Closing balance, net 908 839  
Cost or valuation | Other network equipment      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 18    
Closing balance, net 40 18  
Cost or valuation | Capacity      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 42    
Closing balance, net 17 42  
Cost or valuation | Other      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 6    
Closing balance, net 21 6  
Accumulated depreciation and impairment      
Right-of-Use Assets [Roll Forward]      
Opening balance, net (343)    
Closing balance, net (549) (343)  
Accumulated depreciation and impairment | Land and buildings      
Right-of-Use Assets [Roll Forward]      
Opening balance, net (59)    
Closing balance, net (85) (59)  
Accumulated depreciation and impairment | Sites rental      
Right-of-Use Assets [Roll Forward]      
Opening balance, net (34)    
Closing balance, net (116) (34)  
Accumulated depreciation and impairment | Tower rental      
Right-of-Use Assets [Roll Forward]      
Opening balance, net (232)    
Closing balance, net (320) (232)  
Accumulated depreciation and impairment | Other network equipment      
Right-of-Use Assets [Roll Forward]      
Opening balance, net (4)    
Closing balance, net (14) (4)  
Accumulated depreciation and impairment | Capacity      
Right-of-Use Assets [Roll Forward]      
Opening balance, net (12)    
Closing balance, net (5) (12)  
Accumulated depreciation and impairment | Other      
Right-of-Use Assets [Roll Forward]      
Opening balance, net (3)    
Closing balance, net (8) (3)  
Increase (decrease) due to application of IFRS 16      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 895 1,012  
Closing balance, net   895 1,012
Increase (decrease) due to application of IFRS 16 | Land and buildings      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 147 148  
Closing balance, net   147 148
Increase (decrease) due to application of IFRS 16 | Sites rental      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 93 101  
Closing balance, net   93 101
Increase (decrease) due to application of IFRS 16 | Tower rental      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 607 729  
Closing balance, net   607 729
Increase (decrease) due to application of IFRS 16 | Other network equipment      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 31 15  
Closing balance, net   31 15
Increase (decrease) due to application of IFRS 16 | Capacity      
Right-of-Use Assets [Roll Forward]      
Opening balance, net 14 16  
Closing balance, net   14 16
Increase (decrease) due to application of IFRS 16 | Other      
Right-of-Use Assets [Roll Forward]      
Opening balance, net $ 2 3  
Closing balance, net   $ 2 $ 3
[1] The assets and liabilities of Tigo Guatemala are fully consolidated since the acquisition of the remaining 45% shareholding on November 12, 2021. See note A.1.2. for further details. As a result, numbers might not be directly comparable with previous years' figures.