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Associates and Joint Ventures - Disclosure of Statement of Financial Position and Income Statement of Associates and Joint Ventures (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Joint Ventures And Associates [Line Items]      
Receivables and other assets (Note 14) € 163 € 139  
Current lease liabilities 59 42  
Current payables to related parties 407 203  
Revenue from operations 41,315 40,652 € 39,993
Financial revenues 980 1,099 1,803
Financial expenses 2,998 3,014 3,030
Associates and Joint Ventures      
Disclosure Of Joint Ventures And Associates [Line Items]      
Credits and other financial assets 246 265  
Receivables and other assets (Note 14) 199 184  
Financial liabilities 10 0  
Non-current lease liabilities 69 37  
Non-current payables and other liabilities (Note 21) 434 240  
Long-term contractual liabilities 83 98  
Current payables to related parties 427 227  
Short-term contractual liabilities 20 21  
Revenue from operations 771 696 460
Expenses from operations 813 770 315
Financial revenues 28 30 28
Financial expenses 46 16 10
Associates      
Disclosure Of Joint Ventures And Associates [Line Items]      
Credits and other financial assets 244 263  
Receivables and other assets (Note 14) 87 91  
Financial liabilities 0 0  
Non-current lease liabilities 60 37  
Non-current payables and other liabilities (Note 21) 433 236  
Long-term contractual liabilities 31 44  
Current lease liabilities 55 42  
Current payables to related parties 377 183  
Short-term contractual liabilities 14 15  
Revenue from operations 520 473 209
Expenses from operations 677 634 199
Financial revenues 26 29 27
Financial expenses 45 9 1
Joint ventures      
Disclosure Of Joint Ventures And Associates [Line Items]      
Credits and other financial assets 2 2  
Receivables and other assets (Note 14) 112 93  
Financial liabilities 10 0  
Non-current lease liabilities 9 0  
Non-current payables and other liabilities (Note 21) 1 4  
Long-term contractual liabilities 52 54  
Current lease liabilities 4 0  
Current payables to related parties 50 44  
Short-term contractual liabilities 6 6  
Revenue from operations 251 223 251
Expenses from operations 136 136 116
Financial revenues 2 1 1
Financial expenses € 1 € 7 € 9