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Corporate income tax and deferred taxes assets and liabilities (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred taxes [Line Items]      
Deferred tax assets € 1,159 € 1,006  
Deferred tax liabilities 1,239 1,086  
Deferred taxes assets [Member]      
Deferred taxes [Line Items]      
Deferred tax assets 1,159 1,006 € 784
Prior years transfers and others deferred taxes (131) 80  
Deferred tax expense (income) recognised in profit or loss 105 186  
Deferred tax relating to items credited (charged) directly to equity 145 (42)  
Increase (decrease) through net exchange differences, deferred tax liability (asset) 34 (2)  
Deferred taxes assets [Member] | Tax credits [Member]      
Deferred taxes [Line Items]      
Deferred tax assets 537 503 370
Prior years transfers and others deferred taxes (40) 26  
Deferred tax expense (income) recognised in profit or loss 48 119  
Deferred tax relating to items credited (charged) directly to equity 0 0  
Increase (decrease) through net exchange differences, deferred tax liability (asset) 26 (13)  
Deferred taxes assets [Member] | Differences between tax and accounting [Member]      
Deferred taxes [Line Items]      
Deferred tax assets 377 422 274
Prior years transfers and others deferred taxes (93) 46  
Deferred tax expense (income) recognised in profit or loss 38 87  
Deferred tax relating to items credited (charged) directly to equity 3 4  
Increase (decrease) through net exchange differences, deferred tax liability (asset) 7 11  
Deferred taxes assets [Member] | Equity measurement adjustment [Member]      
Deferred taxes [Line Items]      
Deferred tax assets 197 48 86
Prior years transfers and others deferred taxes 2 (1)  
Deferred tax expense (income) recognised in profit or loss 4 11  
Deferred tax relating to items credited (charged) directly to equity 143 (47)  
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0 0  
Deferred taxes assets [Member] | Other items [Member]      
Deferred taxes [Line Items]      
Deferred tax assets 48 33 55
Prior years transfers and others deferred taxes 0 9  
Deferred tax expense (income) recognised in profit or loss 15 (31)  
Deferred tax relating to items credited (charged) directly to equity 0 1  
Increase (decrease) through net exchange differences, deferred tax liability (asset) 1 0  
Deferred taxes liabilities [Member]      
Deferred taxes [Line Items]      
Deferred tax liabilities 1,239 1,086 924
Prior years transfers and others deferred taxes (194)   58
Deferred tax expense (income) recognised in profit or loss 133   121
Deferred tax relating to items credited (charged) directly to equity 158   3
Increase (decrease) through net exchange differences, deferred tax liability (asset) 57   (20)
Deferred taxes liabilities [Member] | Differences between tax and accounting [Member]      
Deferred taxes [Line Items]      
Deferred tax assets 322 242  
Deferred tax liabilities 548 561 378
Prior years transfers and others deferred taxes (169)   65
Deferred tax expense (income) recognised in profit or loss 119   131
Deferred tax relating to items credited (charged) directly to equity 2   0
Increase (decrease) through net exchange differences, deferred tax liability (asset) 35   (13)
Deferred taxes liabilities [Member] | Equity measurement adjustment [Member]      
Deferred taxes [Line Items]      
Deferred tax liabilities 234 69 64
Prior years transfers and others deferred taxes 1   2
Deferred tax expense (income) recognised in profit or loss 5   1
Deferred tax relating to items credited (charged) directly to equity 156   3
Increase (decrease) through net exchange differences, deferred tax liability (asset) 2   (1)
Deferred taxes liabilities [Member] | Other items [Member]      
Deferred taxes [Line Items]      
Deferred tax liabilities 134 126 145
Prior years transfers and others deferred taxes (9)   (22)
Deferred tax expense (income) recognised in profit or loss 15   0
Deferred tax relating to items credited (charged) directly to equity 0   0
Increase (decrease) through net exchange differences, deferred tax liability (asset) 2   2
Deferred taxes liabilities [Member] | Deferred taxes on goodwill [Member]      
Deferred taxes [Line Items]      
Deferred tax assets 18 21  
Deferred tax liabilities 22 22 21
Prior years transfers and others deferred taxes (1)   0
Deferred tax expense (income) recognised in profit or loss 1   1
Deferred tax relating to items credited (charged) directly to equity 0   0
Increase (decrease) through net exchange differences, deferred tax liability (asset) 0   0
Deferred taxes liabilities [Member] | Deferred fair value adjustment [Member]      
Deferred taxes [Line Items]      
Deferred tax liabilities 301 € 308 315
Prior years transfers and others deferred taxes (17)   13
Deferred tax expense (income) recognised in profit or loss (7)   (12)
Deferred tax relating to items credited (charged) directly to equity 0   0
Increase (decrease) through net exchange differences, deferred tax liability (asset) € 17   € (8)