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Income taxes (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Income Tax Explanatory [Abstract]

Disclosure of detailed information about income taxes [text block]

(€ million)		2017				2016				2015
Current taxes:
- Italian subsidiaries			712				195				155
- subsidiaries of the Exploration & Production segment - outside Italy			3,167				2,671				4,015
- other subsidiaries - outside Italy			142				133				218
			4,021				2,999				4,388
Net deferred taxes:
- Italian subsidiaries			(464	)			(243	)			881
- subsidiaries of the Exploration & Production segment - outside Italy			(162	)			(813	)			(2,156	)
- other subsidiaries - outside Italy			72				(7	)			9
			(554	)			(1,063	)			(1,266	)
			3,467				1,936				3,122

Disclosure of detailed information about The reconciliation between the statutory tax charge and the effective tax charge [Text Block]

The reconciliation between the statutory tax charge calculated by applying the Italian statutory tax rate of 24% (27.5% in 2016 and in 2015) and the effective tax charge is the following:

(€ million)		2017				2016				2015
Profit (loss) before taxation			6,844				892				(4,277	)
Tax rate (IRES) (%)			24.0				27.5				27.5
Statutory corporation tax charge (credit) on profit or loss			1,643				245				(1,176	)
Increase (decrease) resulting from:
- higher tax charges related to subsidiaries outside Italy			1,882				1,152				2,576
- impact pursuant to the write-off of deferred tax assets and recalculation of tax rates			(96	)			397				1,514
- effect due to the tax regime provided for intercompany dividends			1				87				114
- Italian regional income tax (IRAP)			77				42				100
- effect due to non-taxable gains/losses on sales of investments			(177	)			8				(39	)
- impact pursuant to redetermination of the Italian Windfall Corporate tax as per Law 7/2009			61
- effect due to discontinued operations											(288	)
- other adjustments			76				5				321
			1,824				1,691				4,298
Effective tax charge			3,467				1,936				3,122