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Other assets and liabilities F.1. Trade receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables, net $ 343 $ 339 $ 386
Neither past due nor impaired      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables, net 210   259
Gross      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables, net 592   597
Provisions      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables, net (249)   (211)
30–90 days | Past due (net of impairments)      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables, net 95   83
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 37   43
Telecom operators      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables, net 39   49
Telecom operators | Neither past due nor impaired      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables, net 17   29
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 9   16
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 14   4
Own customers      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables, net 246   273
Own customers | Neither past due nor impaired      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables, net 158   186
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 69   52
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 19   34
Others      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables, net 58   64
Others | Neither past due nor impaired      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables, net 36   43
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 17   16
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 $ 5   $ 5