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Other assets and liabilities - Additional information (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items]    
Value added tax receivables € 755 € 569
Current value added tax receivables 637 432
Gas volume prepayments, current   41
Gas volume prepayments, non-current 307 357
Non-current receivables for investing activities 205 23
Current advances received 56 58
Non-current advances received 275 333
Advances received 469 430
Excise duties and consumer taxes 1,034 613
Current value added tax payables 326 332
Non-current cautionary deposits 286 305
Value of gas not withdrawn by customers due to triggering of take-or-pay clause 391 443
Payables related to investing activities 101 83
Current tax credits related to renovation of residential buildings and energy saving 812 366
Non-current tax credits related to renovation of residential buildings and energy saving 2,247 903
Advances received from customers for future gas supplies 10 538
Prepaid electronic fuel vouchers 292 338
Current liabilities for prepaid revenues and income 134 104
Non-current payables to factoring companies connected with the tax credit transfer 2,040 758
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Value of gas not withdrawn by customers due to triggering of take-or-pay clause 131 85
Gas and electricity    
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items]    
Non-current cautionary deposits 213 222
Exploration & Production    
Disclosure Of Detailed Information About Other Assets And Liabilities [Line Items]    
Underlifting positions 295 239
Current overlifting imbalances € 312 € 479