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Other assets and liabilities - Additional information (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items]    
Value added tax receivables € 569 € 498
Current value added tax receivables 432 340
Gas volume prepayments, current 41 41
Gas volume prepayments, non-current 357 94
Non-current receivables for investing activities   23
Excise duties and consumer taxes 613 700
Current value added tax payables 332 248
Non-current cautionary deposits 305 268
Value of gas not withdrawn by customers due to triggering of take-or-pay clause 443 112
Payables related to investing activities 83 103
Non-current payables related to investing activities 79  
Current payables related to investing activities 4  
Current tax credits related to renovation of residential buildings and energy saving 366 110
Non-current tax credits related to renovation of residential buildings and energy saving 903 324
Advances received from customers for future gas supplies 538 77
Prepaid electronic fuel vouchers 338 242
Current liabilities for prepaid revenues and income 104 90
Non-current prepaid revenues and deferred income 247 271
Miscellaneous other current assets 292  
Miscellaneous other non-current assets 667  
Miscellaneous current contract liabilities 212  
Non-current payables to factoring companies connected with the tax credit transfer 758 240
Miscellaneous other current liabilities 151  
Miscellaneous other non-current liabilities 461  
within 1 year    
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items]    
Value of gas not withdrawn by customers due to triggering of take-or-pay clause 85 73
Over 12 months    
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items]    
Value of gas not withdrawn by customers due to triggering of take-or-pay clause 358 39
Gas and electricity    
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items]    
Non-current cautionary deposits 222 223
Engie SA    
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items]    
Current advances received 58 60
Non-current advances received 275 333
Societa Oleodotti Meridionali SpA    
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items]    
Advances received 430 391
Exploration & Production    
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items]    
Underlifting positions 239 316
Current overlifting imbalances € 479 € 630