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Trade and other payables (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Trade payables € 11,645   € 10,890
Down payments and advances from customers, joint venture partners in exploration and production   545
Trade and other payables € 16,747   16,748
Previously stated [member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Trade payables     10,890
Other payables     5,061
Trade and other payables   € 15,305 16,748
Previously stated [member] | From Customers [Member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Down payments and advances from customers, joint venture partners in exploration and production     545
Previously stated [member] | Partners in E&P activities [Member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Down payments and advances from customers, joint venture partners in exploration and production     252
Increase (decrease) due to application of IFRS 15 [member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Other payables     (113)
Trade and other payables     (113)
Reclassification to other current liabilities IFRS 15 [Member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Other payables     (785)
Trade and other payables     (1,330)
Reclassification to other current liabilities IFRS 15 [Member] | From Customers [Member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Down payments and advances from customers, joint venture partners in exploration and production     € (545)
Increase (decrease) due to changes in accounting policy [member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Trade payables   10,890  
Other payables   4,163  
Trade and other payables   (1,443)  
Increase (decrease) due to changes in accounting policy [member] | Partners in E&P activities [Member]      
Disclosure Of Trade And Other Payables Explanatory [Line Items]      
Down payments and advances from customers, joint venture partners in exploration and production   € 252