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Provisions - Movement in Dismantling of asset and Other Provisions (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of other provisions [line items]    
Other provisions at beginning of period € 2,574  
Other provisions at end of period 2,189 € 2,574
Other provisions    
Disclosure of other provisions [line items]    
Other provisions at beginning of period 2,574 2,630
Additions 611 809
Retirements/amount applied (702) (805)
Transfers (60) (16)
Translation differences and other (234) (44)
Other provisions at end of period 2,189 2,574
Dismantling of assets    
Disclosure of other provisions [line items]    
Other provisions at beginning of period 522 528
Additions 38 54
Accretion 43 23
Retirements/amount applied (48) (67)
Transfers 4 14
Business combinations 1  
Translation differences and other (25) (30)
Other provisions at end of period € 535 € 522