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Financial structure and financial costs - Credit risk (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Credit risk      
Maximum credit risk exposure $ 70,664 $ 68,563 $ 66,347
Net margin call (paid) received 1,556 (2,486) (2,581)
Sale of receivables      
Credit risk      
Net value of receivables sold 6,446    
Financial asset remaining recognized after date of sale 0    
Financial liability remaining recognized after date of sale 0    
Reverse factoring      
Credit risk      
Net value of receivables sold 23    
Loans to equity affiliates      
Credit risk      
Maximum credit risk exposure 5,129 3,999 4,755
Loans and advances      
Credit risk      
Maximum credit risk exposure 2,458 1,982 1,877
Other non-current financial assets related to operational activities      
Credit risk      
Maximum credit risk exposure 287 332 471
Non-current financial assets      
Credit risk      
Maximum credit risk exposure 4,781 912 680
Accounts receivable      
Credit risk      
Maximum credit risk exposure 14,068 18,488 17,270
Other operating receivables      
Credit risk      
Maximum credit risk exposure 8,043 11,506 9,733
Current financial assets      
Credit risk      
Maximum credit risk exposure 4,630 3,992 3,654
Cash and cash equivalents      
Credit risk      
Maximum credit risk exposure $ 31,268 $ 27,352 $ 27,907