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Capital structure and financing - C.5. Cash and deposits (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
 [2]
Dec. 31, 2016
 [2]
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 1,164,000,000 $ 528,000,000 [1],[2],[3] $ 619,000,000 $ 646,000,000
Restricted cash 155,000,000 158,000,000 [1],[3]    
Non-current financial assets pledged as collateral for contingent liabilities 0 0    
Current financial assets pledged as collateral for contingent liabilities 1,000,000 2,000,000    
US Dollar        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 834,000,000 229,000,000    
Total debt denominated in other currencies        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 330,000,000 299,000,000    
Mobile Financial Services        
Cash and Cash Equivalents [Line Items]        
Restricted cash 150,000,000 155,000,000    
Other Banks        
Cash and Cash Equivalents [Line Items]        
Restricted cash $ 5,000,000 $ 3,000,000    
[1] Not restated for the application of IFRS 16 as the Group elected the modified retrospective approach.
[2] Re-presented for discontinued operations (shown in note A.4. and E.4.2.). 2018 and 2017 were not restated for the application of IFRS 16, and , additionally,2017 was not restated for the application of IFRS 15 and IFRS 9, as the Group elected the modified retrospective approach.
[3] The consolidated statement of financial position at December 31, 2018 has been restated after finalization of the Cable Onda purchase accounting (note A.1.2.).