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Corporate income tax and deferred taxes credits (Details) - Continuining operations of the company [Member] - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets item [Line Items]    
Tax-loss carryforwards € 3,691 € 3,549
Maximum tax credit 887 853
Tax credit recognise 517 473
US tax consolidated group [Member]    
Deferred tax assets item [Line Items]    
Tax-loss carryforwards 2,138 1,790
Maximum tax credit 493 409
Tax credit recognise 443 376
Spanish tax consolidated group [Member]    
Deferred tax assets item [Line Items]    
Tax-loss carryforwards 303 585
Maximum tax credit 76 146
Tax credit recognise 23 36
TURKIYE    
Deferred tax assets item [Line Items]    
Tax-loss carryforwards 107 81
Maximum tax credit 27 20
Tax credit recognise 0 0
CANADA    
Deferred tax assets item [Line Items]    
Tax-loss carryforwards 28 106
Maximum tax credit 7 28
Tax credit recognise 0 20
UNITED KINGDOM    
Deferred tax assets item [Line Items]    
Tax-loss carryforwards 218 201
Maximum tax credit 55 50
Tax credit recognise 0 5
Other countries [Member]    
Deferred tax assets item [Line Items]    
Tax-loss carryforwards 579 559
Maximum tax credit 146 141
Tax credit recognise 41 36
Netherlands tax consolidated group [Member]    
Deferred tax assets item [Line Items]    
Tax-loss carryforwards 288 227
Maximum tax credit 74 59
Tax credit recognise 10 € 0
AUSTRALIA    
Deferred tax assets item [Line Items]    
Tax-loss carryforwards 30  
Maximum tax credit 9  
Tax credit recognise € 0