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Income taxes (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current taxes: |  |  |
Current taxes: | € 4,021 | € 2,999 | € 4,388
Net deferred taxes: |  |  |
Net deferred taxes: | (554) | (1,063) | (1,266)
Tax Income (Expense) | 3,467 | 1,936 | 3,122
Italian subsidiaries [Member] | Italy [Member] |  |  |
Current taxes: |  |  |
Current taxes: | 712 | 195 | 155
Net deferred taxes: |  |  |
Net deferred taxes: | (464) | (243) | 881
Subsidiaries of the Exploration Production segment [Member] | Subsidiaries outside Italy [Member] |  |  |
Current taxes: |  |  |
Current taxes: | 3,167 | 2,671 | 4,015
Net deferred taxes: |  |  |
Net deferred taxes: | (162) | (813) | (2,156)
Other subsidiaries [Member] | Subsidiaries outside Italy [Member] |  |  |
Current taxes: |  |  |
Current taxes: | 142 | 133 | 218
Net deferred taxes: |  |  |
Net deferred taxes: | € 72 | € (7) | € 9

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