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Capital structure and financing - C.4. Cash and deposits (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1]
Dec. 31, 2015
 [1]
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 528,000,000 $ 619,000,000 [1] $ 646,000,000 $ 769,000,000
Restricted cash 158,000,000 145,000,000    
Non-current financial assets pledged as collateral for contingent liabilities 0 0    
Current financial assets pledged as collateral for contingent liabilities 2,000,000 1,000,000    
US Dollar        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 229,000,000 302,000,000    
Total debt denominated in other currencies        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 299,000,000 317,000,000    
Mobile Financial Services [Member]        
Cash and Cash Equivalents [Line Items]        
Restricted cash 155,000,000 143,000,000    
Other Banks [Member]        
Cash and Cash Equivalents [Line Items]        
Restricted cash $ 3,000,000 $ 2,000,000    
[1] Re-presented for discontinued operations (shown in note A.4. and E.3.2.). Not restated for the application of IFRS 15 and 9, as the Group elected the modified retrospective approach for both standards.