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Capital structure and financing - C.5. Cash and deposits (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
 [1]
Dec. 31, 2019
 [1]
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 1,039 $ 895 [1],[2] $ 875 $ 1,164
Restricted cash 57 203 [2]    
Financial assets pledged as collateral for liabilities or contingent liabilities 0 35    
Debt denominated in US dollars        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 820 526    
Total debt denominated in other currencies        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 220 369    
Mobile Financial Services        
Cash and Cash Equivalents [Line Items]        
Restricted cash 50 197    
Other Banks        
Cash and Cash Equivalents [Line Items]        
Restricted cash $ 6 $ 7    
[1] Re-presented for discontinued operations (see note A.4.).
[2] Restated after the finalization of the Guatemala purchase accounting. See note A.1.2. for further details.