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Performance B.2. Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cost of sales:      
Direct costs of services sold $ (847) $ (878) $ (799)
Cost of telephone, equipment and other accessories (216) (230) (229)
Bad debt and obsolescence costs (108) (93) (90)
Cost of sales (1,171) (1,201) (1,117) [1]
Operating expenses, net      
Marketing expenses (396) (402) (391)
Site and network maintenance costs (234) (245) (192)
Employee related costs (477) (496) (500)
External and other services (174) (204) (181)
Rentals and (operating) leases (1) (1) (152)
Other operating expenses (225) (257) (201)
Operating expenses, net (1,505) (1,604) (1,616) [1]
Other operating income (expenses), net:      
Income from tower deal transactions 0 5 61
Impairment of intangible assets and property, plant and equipment 0 (8) (6)
Gain (loss) on disposals of intangible assets and property, plant and equipment 0 0 7
Impairment of AirtelTigo's receivable (45) 0 0
Gain (loss) on disposal of equity investments 25 (32) 0
Other income (expenses) 9 1 13
Other operating income (expenses), net $ (12) $ (34) $ 75 [1]
[1] 2018 was not restated for the application of IFRS 16, as the Group elected the modified retrospective approach.