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Subsequent events - Adittional Information (Details) - EUR (€)
€ in Millions
Feb. 06, 2026
Dec. 31, 2025
Feb. 19, 2026
Dec. 31, 2024
Disclosure of non-adjusting events after reporting period [line items]        
Other intangible assets   € 15,709   € 22,379
Green House Gas (GHG)        
Disclosure of non-adjusting events after reporting period [line items]        
Other intangible assets   279    
Green House Gas (GHG)        
Disclosure of non-adjusting events after reporting period [line items]        
New provisions, other provisions   € 345    
Entering into significant commitments or contingent liabilities | Asset-Backed Terms Note        
Disclosure of non-adjusting events after reporting period [line items]        
Notional amount     € 1,500  
NextStar Energy Inc | Disposal of major subsidiary        
Disclosure of non-adjusting events after reporting period [line items]        
Proportion of ownership interest in joint venture, disposal 49.00%