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Property, plant and equipment - Stratification of suspended wells (Details) € in Millions | Dec. 31, 2019 EUR (€) item | Dec. 31, 2018 EUR (€) item | Dec. 31, 2017 EUR (€) item | Dec. 31, 2016 EUR (€)
--- | --- | --- | --- | ---
Property, plant and equipment |  |  |  |
Property, plant and equipment | € 62,192 | € 60,302 | € 63,158 |
Suspended exploration wells pending final determination |  |  |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | € 1,246 | € 1,101 | € 1,263 | € 1,684
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item | 40.5 | 34.1 | 33.3 |
Suspended exploration wells pending final determination | fields including wells drilled over the last 12 months |  |  |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | € 185 | € 111 | € 148 |
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item | 7.7 | 7.0 | 5.9 |
Suspended exploration wells pending final determination | fields for which the delineation campaign is in progress |  |  |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | € 556 | € 217 | € 261 |
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item | 11.3 | 4.7 | 4.7 |
Suspended exploration wells pending final determination | fields including commercial discoveries that proceeds to sanctioning |  |  |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | € 505 | € 773 | € 854 |
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item | 21.5 | 22.4 | 22.7 |
Suspended exploration wells pending final determination | within 1 year |  |  |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | € 185 | € 111 | € 222 |
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item | 7.7 | 7.0 | 8.0 |
Suspended exploration wells pending final determination | between 1 and 3 years |  |  |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | € 171 | € 87 | € 241 |
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item | 6.4 | 2.9 | 3.9 |
Suspended exploration wells pending final determination | beyond 3 years |  |  |  |
Property, plant and equipment |  |  |  |
Property, plant and equipment | € 890 | € 903 | € 800 |
Costs capitalized and suspended for exploratory well activity, number of wells in Eni's interest | item | 26.4 | 24.2 | 21.4 |

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_a&doctype=Standard -URIDate 2019-03-27 + Details
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