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Financial structure and financial costs - Credit risk (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Credit risk      
Maximum credit risk exposure $ 70,436 $ 61,319 $ 60,892
Net margin call (paid) received (870) 2,605 (124)
Sale of receivables      
Credit risk      
Net value of receivables sold 7,845    
Financial asset remaining recognized after date of sale 0    
Recognised liabilities representing continuing involvement in derecognised financial assets 0    
Reverse factoring      
Credit risk      
Net value of receivables sold 300    
Loans to equity affiliates      
Credit risk      
Maximum credit risk exposure 5,135 4,718 4,378
Loans and advances      
Credit risk      
Maximum credit risk exposure 2,878 3,048 3,407
Other non-current financial assets related to operational activities      
Credit risk      
Maximum credit risk exposure 937 1,069 891
Non-current financial assets      
Credit risk      
Maximum credit risk exposure 679 908 1,219
Accounts receivable, net      
Credit risk      
Maximum credit risk exposure 14,893 12,213 10,629
Other operating receivables      
Credit risk      
Maximum credit risk exposure 9,336 10,218 10,909
Current financial assets      
Credit risk      
Maximum credit risk exposure 3,393 4,548 6,190
Cash and cash equivalents      
Credit risk      
Maximum credit risk exposure $ 33,185 $ 24,597 $ 23,269