Income tax receivables and payables - Additional information (Details) - EUR (€) € in Millions	Dec. 31, 2021	Dec. 31, 2020
Income tax receivables and payables
Pending litigation with tax authorities	€ 230	€ 254

The non-current amount of tax liabilities relating to pending litigation with tax authorities.

No definition available.

Name:	e_PendingLitigationWithTaxAuthoritiesTaxLiabilitiesNonCurrent
Namespace Prefix:	e_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant