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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Profit or loss [abstract]      
Net profit (loss) € 3,377 € (1,457) € (9,373)
Items that are not reclassified to profit or loss in later periods      
Remeasurements of defined benefit plans (33) 16 36
Tax effect related to other comprehensive income not to be reclassified to profit or loss in subsequent periods 29 (35) (21)
Other comprehensive income that will not be reclassified to profit or loss, net of tax (4) (19) 15
Items that may be reclassified to profit or loss in later periods      
Currency translation differences (5,573) 1,198 4,837
Change in the fair value of available-for-sale financial instruments (5) (4) (4)
Change in the fair value of cash flow hedging derivatives (6) 883 (256)
Share of other comprehensive income on equity-accounted entities 69 32 (9)
Tax effect related to other comprehensive income to be reclassified to profit or loss in subsequent periods 1 (220) 66
Other comprehensive income that will be reclassified to profit or loss, net of tax (5,514) 1,889 4,634
Total other items of comprehensive income (loss) (5,518) 1,870 4,649
Total comprehensive income (loss) (2,141) 413 (4,724)
Attributable to Eni      
- continuing operations (2,144) 819 (3,416)
- discontinued operations   (413) (779)
Comprehensive income, attributable to owners of parent (2,144) 406 (4,195)
Attributable to non-controlling interest      
- continuing operations 3 7 554
- discontinued operations     (1,083)
Comprehensive income, attributable to non-controlling interests € 3 € 7 € (529)