Other information - Additional Information (Details 1)	12 Months Ended
Dec. 31, 2022 NUMBER
Azule Energy Holdings Ltd
Other information
Proportion of ownership interest in joint venture (as a percent)	50.00%
Proportion of ownership interest acquired (as a percent)	50.00%
Azule Energy Holdings Ltd \| Angola
Other information
Number of partners in oil and gas operation	2
Azule Energy Holdings Ltd \| Be Power SpA
Other information
Proportion of ownership interest in joint venture (as a percent)	50.00%
Vårgrønn AS
Other information
Proportion of ownership interest in joint venture (as a percent)	65.00%
Vårgrønn AS \| Eni North Sea Wind Ltd
Other information
Equity interest disposed (as a percent)	100.00%
Vårgrønn AS \| Eni North Sea Wind Ltd \| UK Dogger Bank A, B and C projects
Other information
Proportion of ownership interest acquired (as a percent)	20.00%

The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2023-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2023-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2023-03-23

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2023-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2023-03-23

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Namespace Prefix:	ifrs-full_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration