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Other assets and liabilities F.1. Trade receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net $ 351 $ 371 [1]
Neither past due nor impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 216 241
Gross    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 649 636
Provisions    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net (298) (265)
30–90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 90 88
Greater than 90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 45 43
Telecom operators    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 25 40
Telecom operators | Neither past due nor impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 15 23
Telecom operators | 30–90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 7 9
Telecom operators | Greater than 90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 3 8
Own customers    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 266 270
Own customers | Neither past due nor impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 167 177
Own customers | 30–90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 65 63
Own customers | Greater than 90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 34 29
Others    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 60 60
Others | Neither past due nor impaired    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 34 40
Others | 30–90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net 19 15
Others | Greater than 90 days | Past due (net of impairments)    
Disclosure of financial assets that are either past due or impaired [line items]    
Trade receivables, net $ 8 $ 5
[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.).