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Debt - Asset-backed financing (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]      
Borrowings € 45,947 € 37,227 € 29,463
Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings 14,759 9,866  
Warehouse Credit Facilities: | SFS Funding I | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings 4,442 4,034  
Warehouse Credit Facilities: | FIARC | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings 28 60  
Warehouse Credit Facilities: | SFMOT Floorplan Facility | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings 945 565  
Term Notes: | FIAOT 2021-1 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 0 27  
Term Notes: | FIAOT 2021-1 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 0.45%    
Term Notes: | FIAOT 2021-1 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 5.37%    
Term Notes: | FIAOT 2021-2 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 30 63  
Term Notes: | FIAOT 2021-2 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 0.48%    
Term Notes: | FIAOT 2021-2 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 3.14%    
Term Notes: | FIAOT 2022-1 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 41 83  
Term Notes: | FIAOT 2022-1 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 2.03%    
Term Notes: | FIAOT 2022-1 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 5.41%    
Term Notes: | FIAOT 2022-2 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 44 95  
Term Notes: | FIAOT 2022-2 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 6.26%    
Term Notes: | FIAOT 2022-2 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 8.71%    
Term Notes: | FIAOT 2023-1 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 72 131  
Term Notes: | FIAOT 2023-1 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 6.44%    
Term Notes: | FIAOT 2023-1 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 7.74%    
Term Notes: | FIAOT 2025-1 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 533 0  
Term Notes: | FIAOT 2025-1 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.21%    
Term Notes: | FIAOT 2025-1 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 5.22%    
Term Notes: | SFAST 2023-1 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 268 522  
Term Notes: | SFAST 2023-1 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 5.47%    
Term Notes: | SFAST 2023-1 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 5.97%    
Term Notes: | SFAST 2024-1 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 349 645  
Term Notes: | SFAST 2024-1 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.94%    
Term Notes: | SFAST 2024-1 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 5.59%    
Term Notes: | SFAST 2024-2 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 427 760  
Term Notes: | SFAST 2024-2 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 5.26%    
Term Notes: | SFAST 2024-2 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 5.71%    
Term Notes: | SFAST 2024-3 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 474 829  
Term Notes: | SFAST 2024-3 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.55%    
Term Notes: | SFAST 2024-3 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.98%    
Term Notes: | SFAST 2025-1 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 520 0  
Term Notes: | SFAST 2025-1 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.49%    
Term Notes: | SFAST 2025-1 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 5.20%    
Term Notes: | SFAST 2025-2 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 632 0  
Term Notes: | SFAST 2025-2 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.44%    
Term Notes: | SFAST 2025-2 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 5.05%    
Term Notes: | SFAST 2025-3 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 631 0  
Term Notes: | SFAST 2025-3 | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.09%    
Term Notes: | SFAST 2025-3 | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.64%    
Term Notes: | SFUEL 2025-A | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 1,086 0  
Term Notes: | SFUEL 2025-A | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.47%    
Term Notes: | SFUEL 2025-A | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 5.08%    
Term Notes: | SFUEL 2025-B | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 1,169 0  
Term Notes: | SFUEL 2025-B | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.27%    
Term Notes: | SFUEL 2025-B | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.71%    
Term Notes: | SFUEL 2025-C | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Borrowings € 1,283 0  
Term Notes: | SFUEL 2025-C | Minimum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 3.88%    
Term Notes: | SFUEL 2025-C | Maximum | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.44%    
Term Loans: | SFAF 2024-1 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.82%    
Borrowings € 839 555  
Term Loans: | SFAF 2024-2 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 5.45%    
Borrowings € 292 590  
Term Loans: | SFALV 2024-1 | Asset-backed financing      
Disclosure of detailed information about borrowings [line items]      
Interest rate % 4.80%    
Borrowings € 654 € 907