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Capital structure and financing - C.6. Net financial obligations, table 1 (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
 [2]
Share Capital, Reserves And Other Equity Interest And Financial Instruments [Abstract]        
Total debt and financing $ 5,691 $ 5,972    
Lease liabilities 1,021 1,096    
Gross financial obligations 6,711 7,068    
Cash and cash equivalents (875) (1,164) [1] $ (528) [2] $ (619)
Pledged deposits 0 (1)    
Time deposits related to bank borrowings 0 (1)    
Net financial obligations at the end of the year 5,837 5,902 $ 4,596  
Add (less) derivatives related to debt (note D.1.2.) 12 (17)    
Net financial obligations including derivatives related to debt 5,849 5,885    
Restricted cash $ 199 $ 155 [1]    
[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.