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Performance B.2. Expenses (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jan. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cost of sales:        
Direct costs of services sold   $ (938) $ (847) $ (878)
Cost of telephone, equipment and other accessories   (278) (216) (230)
Bad debt and obsolescence costs   (86) (108) (93)
Cost of sales   (1,302) [1] (1,171) (1,201)
Operating expenses, net        
Marketing expenses   (495) (396) (402)
Site and network maintenance costs   (254) (234) (245)
Employee related costs   (503) (477) (496)
External and other services   (177) (174) (204)
Rentals and (operating) leases   0 (1) (1)
Other operating expenses   (248) (225) (257)
Operating expenses, net   (1,677) [1] (1,505) (1,604)
Other operating income (expenses), net:        
Income from tower deal transactions   0 0 5
Impairment of intangible assets and property, plant and equipment   (5) 0 (8)
Gain (loss) on disposals of intangible assets and property, plant and equipment   6 0 0
Impairment of AirtelTigo's receivable     (45) 0
Reverse earn-out in respect of Zantel's acquisition   11 0 0
Gain (loss) on disposal of equity investments   (15) 25 (32)
Other income (expenses) (ii)   10 9 1
Other operating income (expenses), net   6 [1] $ (12) $ (34)
Paraguay        
Other operating income (expenses), net:        
Amount presented in other comprehensive income realised at derecognition of financial liability   4    
Ghana        
Other operating income (expenses), net:        
Other reversals of provisions   $ 4    
Zantel | Earn Out Income Settlement        
Other operating income (expenses), net:        
Proceeds from earn-out income settlement $ 11      
[1] (i)    Tigo Guatemala is 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.