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Net deferred tax position - Summary of Tax Losses Available for Carry-forward (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of tax losses available for carryforward [line items]      
Tax losses available for carry-forward [1] € 9,812 € 8,933 € 8,503
Tax loss carry-forwards on asset disposals 40 € 5 € 5
Year 1      
Disclosure of tax losses available for carryforward [line items]      
Tax losses available for carry-forward [1] 1    
Year 2      
Disclosure of tax losses available for carryforward [line items]      
Tax losses available for carry-forward [1] 17    
Year 3      
Disclosure of tax losses available for carryforward [line items]      
Tax losses available for carry-forward [1] 12    
Year 4      
Disclosure of tax losses available for carryforward [line items]      
Tax losses available for carry-forward [1] 30    
Year 5      
Disclosure of tax losses available for carryforward [line items]      
Tax losses available for carry-forward [1] 187    
Year 5 and later      
Disclosure of tax losses available for carryforward [line items]      
Tax losses available for carry-forward [1] € 9,565    
[1] (a)Excluding tax loss carry-forwards on asset disposals. Such carry-forwards amounted to €40 million as of December 31, 2024, €5 million as of December 31, 2023 and €5 million as of December 31, 2022