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Financial structure and financial costs - Financing cash flows, Cash and cash equivalents (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in non-current financial debt        
Issuance of non-current debt $ 16,075 $ 8,668 $ 3,938  
Repayment of non-current debt (275) (538) (3,289)  
NET AMOUNT 15,800 8,131 649  
Cash and cash equivalents        
Cash 14,518 16,456 15,186  
Cash equivalents 16,750 10,896 12,721  
Total cash and cash equivalents 31,268 $ 27,352 $ 27,907 $ 33,185
Restricted cash and cash equivalents $ 2,140