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Investments in infrastructure projects of intangible asset model (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Jan. 01, 2024
Jan. 01, 2023
Intangible asset model [Line Items]          
Investments in infrastructure projects intangible asset model € 13,989 € 13,333 € 13,989 € 13,333 € 13,504
Increase decrease in investments in infrastructure projects intangible asset model additions (154) 460      
Increase decrease in investments in infrastructure projects intangible asset mode disposals   (1)      
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate 812 (376)      
Accumulated depreciation amortization [Member]          
Intangible asset model [Line Items]          
Investments in infrastructure projects intangible asset model   (834) (1,089) (834) (781)
Increase decrease in investments in infrastructure projects intangible asset model additions (209) (201)      
Increase decrease in investments in infrastructure projects intangible asset mode disposals   0      
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate (46) 16      
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers   132      
Net investment in toll roads [Member]          
Intangible asset model [Line Items]          
Investments in infrastructure projects intangible asset model   12,715 13,396 12,715 12,872
Increase decrease in investments in infrastructure projects intangible asset model additions (130) 476      
Increase decrease in investments in infrastructure projects intangible asset mode disposals   (1)      
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate 812 (377)      
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers   (255)      
Investment in other infrastructure projects [Member]          
Intangible asset model [Line Items]          
Investments in infrastructure projects intangible asset model   650 650 650 632
Increase decrease in investments in infrastructure projects intangible asset model additions 0 18      
Increase decrease in investments in infrastructure projects intangible asset mode disposals   0      
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate 0 0      
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers   0      
Depreciation amortization in other infrastructure projects [Member]          
Intangible asset model [Line Items]          
Investments in infrastructure projects intangible asset model   (34) (58) (34) 0
Increase decrease in investments in infrastructure projects intangible asset model additions (24) (34)      
Increase decrease in investments in infrastructure projects intangible asset mode disposals   0      
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate 0 0      
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers   0      
Total net investment in other infrastructure projects [Member]          
Intangible asset model [Line Items]          
Investments in infrastructure projects intangible asset model   616 592 616 632
Increase decrease in investments in infrastructure projects intangible asset model additions (24) (16)      
Increase decrease in investments in infrastructure projects intangible asset mode disposals   0      
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate 0 0      
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers   0      
Total investment [Member]          
Intangible asset model [Line Items]          
Investments in infrastructure projects intangible asset model   14,199 15,135 14,199 14,285
Increase decrease in investments in infrastructure projects intangible asset model additions 79 695      
Increase decrease in investments in infrastructure projects intangible asset mode disposals   (1)      
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate 858 (393)      
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers   (387)      
Total depreciation amortization and provision [Member]          
Intangible asset model [Line Items]          
Investments in infrastructure projects intangible asset model   (867) (1,146) (867) (781)
Increase decrease in investments in infrastructure projects intangible asset model additions (233) (235)      
Increase decrease in investments in infrastructure projects intangible asset mode disposals   0      
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate (46) 17      
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers   132      
Spanish toll roads [Member]          
Intangible asset model [Line Items]          
Investments in infrastructure projects intangible asset model   721 724 721 714
Increase decrease in investments in infrastructure projects intangible asset model additions 3 7      
Increase decrease in investments in infrastructure projects intangible asset mode disposals   0      
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate 0 0      
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers   0      
US toll roads [Member]          
Intangible asset model [Line Items]          
Investments in infrastructure projects intangible asset model   12,823 13,757 12,823 12,547
Increase decrease in investments in infrastructure projects intangible asset model additions 76 670      
Increase decrease in investments in infrastructure projects intangible asset mode disposals   (1)      
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate 858 (393)      
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers   0      
Other toll roads [Member]          
Intangible asset model [Line Items]          
Investments in infrastructure projects intangible asset model   4 4 4 391
Increase decrease in investments in infrastructure projects intangible asset model additions 0 0      
Increase decrease in investments in infrastructure projects intangible asset mode disposals   0      
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate 0 0      
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers   (387)      
Toll road investment [Member]          
Intangible asset model [Line Items]          
Investments in infrastructure projects intangible asset model   13,549 € 14,485 € 13,549 € 13,653
Increase decrease in investments in infrastructure projects intangible asset model additions 79 677      
Increase decrease in investments in infrastructure projects intangible asset mode disposals   (1)      
Increase decrease in investments in infrastructure projects intangible asset mode exchange rate € 858 (393)      
Increase decrease in investments in infrastructure projects intangible asset mode consolidation scope changes and transfers   € (387)