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Capital structure and financing - C.5. Cash and deposits (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
 [2]
Dec. 31, 2017
 [2]
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 875,000,000 $ 1,164,000,000 [1] $ 528,000,000 $ 619,000,000
Restricted cash 199,000,000 155,000,000 [1]    
Non-current financial assets pledged as collateral for contingent liabilities 0 0    
Current financial assets pledged as collateral for contingent liabilities 0 1,000,000    
Debt denominated in US dollars        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 619,000,000 834,000,000    
Total debt denominated in other currencies        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 256,000,000 330,000,000    
Mobile Financial Services        
Cash and Cash Equivalents [Line Items]        
Restricted cash 192,000,000 150,000,000    
Other Banks        
Cash and Cash Equivalents [Line Items]        
Restricted cash $ 7,000,000 $ 5,000,000    
[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.).
[2] 2018 was not restated for the application of IFRS 16, as the Group elected the modified retrospective approach.