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Shareholders' equity (Tables)

12 Months Ended

Dec. 31, 2017

Shareholders Equity Tables

Disclosure Of Non controlling Interests Explanatory [text block]

Non-controlling interest

		Net profit								Shareholders’ equity
(€ million)		2017				2016				December 31, 2017				December 31, 2016
EniPower Mantova SpA			4				5				23				21
Adriaplin Doo			2				2				14				13
Serfactoring SpA			(3	)							12				15
			3				7				49				49

Disclosure of Eni shareholders' equity [text block]

Eni shareholders’ equity

(€ million)		December 31, 2017				December 31, 2016
Share capital			4,005				4,005
Legal reserve			959				959
Reserve for treasury shares			581				581
Reserve related to the fair value of cash flow hedging derivatives net of the tax effect			183				189
Reserve related to the fair value of available-for-sale securities net of the tax effect							4
Reserve related to the defined benefit plans net of tax effect			(114	)			(112	)
Other reserves			280				211
Cumulative currency translation differences			4,818				10,319
Treasury shares			(581	)			(581	)
Retained earnings			35,966				40,367
Interim dividend			(1,441	)			(1,441	)
Net profit (loss) for the year			3,374				(1,464	)
			48,030				53,037

Disclosure of reserves within equity [text block]

The reserves related to the valuation at fair value of cash flow hedging derivatives, available-for-sale financial instruments and defined benefit plans, net of the related tax effect, consisted of the following:

		Cash flow hedge derivatives											Available-for-sale financial instruments												Defined benefit plans												Total
(€ million)		Gross reserve			Deferred tax liabilities				Net reserve				Gross reserve				Deferred tax liabilities				Net reserve				Gross reserve				Deferred tax liabilities				Net reserve				Gross reserve				Deferred tax liabilities				Net reserve
Reserve as of December 31, 2016			246				(57	)			189				5				(1	)			4				(99	)			(13	)			(112	)			152				(71	)			81
Changes of the year 2017			(59	)			14				(45	)			(5	)			1				(4	)			(33	)			29				(4	)			(97	)			44				(53	)
Foreign currency translation differences																											(1	)			3				2				(1	)			3				2
Reversal of the year 2017			53				(14	)			39																												53				(14	)			39
Reserve as of December 31, 2017			240				(57	)			183																(133	)			19				(114	)			107				(38	)			69
Reserve as of December 31, 2015			(637	)			163				(474	)			9				(1	)			8				(111	)			10				(101	)			(739	)			172				(567	)
Changes of the year 2016			360				(90	)			270				(3	)							(3	)			16				(35	)			(19	)			373				(125	)			248
Foreign currency translation differences																											(4	)			12				8				(4	)			12				8
Reversal of the year 2016			523				(130	)			393				(1	)							(1	)															522				(130	)			392
Reserve as of December 31, 2016			246				(57	)			189				5				(1	)			4				(99	)			(13	)			(112	)			152				(71	)			81

Disclosure of detailed information about reconciliation of net profit and shareholders' equity of parent company to consolidated net profit and shareholders' equity [text Block]

Reconciliation of net profit and shareholders’ equity of the parent company Eni SpA to consolidated net profit and shareholders’ equity

		Net profit								Shareholders’ equity
(€ million)		2017				2016				December 31, 2017				December 31, 2016
As recorded in Eni SpA’s Financial Statements			3,586				4,521				42,529				41,935
Excess of net equity stated in the separate accounts of consolidated subsidiaries over the corresponding carrying amounts of the parent company			(466	)			(5,480	)			6,110				12,384
Consolidation adjustments:
- difference between purchase cost and underlying carrying amounts of net equity			(1	)			(44	)			145				240
- adjustments to comply with Group account policies			202				(188	)			719				461
- elimination of unrealized intercompany profits			(88	)			(56	)			(807	)			(801	)
- deferred taxation			144				(210	)			(617	)			(1,133	)
			3,377				(1,457	)			48,079				53,086
Non-controlling interest			(3	)			(7	)			(49	)			(49	)
As recorded in Consolidated Financial Statements			3,374				(1,464	)			48,030				53,037

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