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Long-term assets - E.3 Leases (Details) - USD ($)
$ in Millions
 4 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Right-of-Use Assets [Roll Forward]        
Opening balance, net [1]   $ 1,012    
Change in scope   0 $ 212  
Additions $ 30 86 102  
Modifications   (8) 11  
Impairments   (1) (1)  
Disposals   (12) (10)  
Depreciation   (155) (141)  
Asset retirement obligations   0 0  
Transfers   4 1  
Transfers to/from assets held for sale     (9)  
Exchange rate movements   (32) (10)  
Closing balance, net 1,012 [1] 895 1,012 [1]  
Gains or losses arising from sale and leaseback transactions   0 5 $ 61
Income from tower deal transactions   0 22 141
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   148    
Change in scope   0 3  
Additions   41 25  
Modifications   9 6  
Impairments   (1) (1)  
Disposals   (10) (4)  
Depreciation   (38) (35)  
Asset retirement obligations   0 0  
Transfers   0 0  
Transfers to/from assets held for sale     (1)  
Exchange rate movements   (3) 0  
Closing balance, net 148 147 148  
Sites rental        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   101    
Change in scope   0 58  
Additions   2 4  
Modifications   10 (2)  
Impairments   0 0  
Disposals   (1) (4)  
Depreciation   (17) (16)  
Asset retirement obligations   1 0  
Transfers   0 0  
Transfers to/from assets held for sale     (5)  
Exchange rate movements   (2) (2)  
Closing balance, net 101 93 101  
Tower rental        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   729    
Change in scope   0 130  
Additions   23 67  
Modifications   (27) 7  
Impairments   0 0  
Disposals   0 (1)  
Depreciation   (88) (86)  
Asset retirement obligations   0 0  
Transfers   (2) 1  
Transfers to/from assets held for sale     (3)  
Exchange rate movements   (27) (7)  
Closing balance, net 729 607 729  
Other network equipment        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   15    
Change in scope   0 13  
Additions   18 2  
Modifications   (1) 0  
Impairments   0 0  
Disposals   (1) 0  
Depreciation   (8) 0  
Asset retirement obligations   0 0  
Transfers   5 0  
Transfers to/from assets held for sale     0  
Exchange rate movements   0 0  
Closing balance, net 15 31 15  
Capacity        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   16    
Change in scope   0 8  
Additions   1 1  
Modifications   0 0  
Impairments   0 0  
Disposals   0 0  
Depreciation   (1) (2)  
Asset retirement obligations   0 0  
Transfers   0 0  
Transfers to/from assets held for sale     0  
Exchange rate movements   0 0  
Closing balance, net 16 14 16  
Other        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   3    
Change in scope   0 0  
Additions   1 1  
Modifications   0 0  
Impairments   0 0  
Disposals   0 0  
Depreciation   (2) (2)  
Asset retirement obligations   (1) 0  
Transfers   1 0  
Transfers to/from assets held for sale     0  
Exchange rate movements   0 0  
Closing balance, net 3 2 3  
Cost or valuation        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   1,250    
Closing balance, net 1,250 1,238 1,250  
Cost or valuation | Land and buildings        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   181    
Closing balance, net 181 206 181  
Cost or valuation | Sites rental        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   119    
Closing balance, net 119 127 119  
Cost or valuation | Tower rental        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   905    
Closing balance, net 905 839 905  
Cost or valuation | Other network equipment        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   18    
Closing balance, net 18 42 18  
Cost or valuation | Capacity        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   19    
Closing balance, net 19 18 19  
Cost or valuation | Other        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   8    
Closing balance, net 8 6 8  
Accumulated depreciation and impairment        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   (238)    
Closing balance, net (238) (343) (238)  
Accumulated depreciation and impairment | Land and buildings        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   (34)    
Closing balance, net (34) (59) (34)  
Accumulated depreciation and impairment | Sites rental        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   (18)    
Closing balance, net (18) (34) (18)  
Accumulated depreciation and impairment | Tower rental        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   (176)    
Closing balance, net (176) (232) (176)  
Accumulated depreciation and impairment | Other network equipment        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   (2)    
Closing balance, net (2) (12) (2)  
Accumulated depreciation and impairment | Capacity        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   (3)    
Closing balance, net (3) (4) (3)  
Accumulated depreciation and impairment | Other        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   (5)    
Closing balance, net (5) (3) (5)  
Increase (decrease) due to application of IFRS 16        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   1,012 856  
Closing balance, net 1,012   1,012 856
Increase (decrease) due to application of IFRS 16 | Land and buildings        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   148 154  
Closing balance, net 148   148 154
Increase (decrease) due to application of IFRS 16 | Sites rental        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   101 67  
Closing balance, net 101   101 67
Increase (decrease) due to application of IFRS 16 | Tower rental        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   729 623  
Closing balance, net 729   729 623
Increase (decrease) due to application of IFRS 16 | Other network equipment        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   16 0  
Closing balance, net 16   16 0
Increase (decrease) due to application of IFRS 16 | Capacity        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   15 9  
Closing balance, net 15   15 9
Increase (decrease) due to application of IFRS 16 | Other        
Right-of-Use Assets [Roll Forward]        
Opening balance, net   $ 3 4  
Closing balance, net $ 3   $ 3 $ 4
[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.).