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Taxation - Additional information (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax asset for right of use assets € 195 € 205 € 220
Deferred taxes for lease liabilities 217 231 252
Deferred tax expense (income) recognised in profit or loss 1,059 (3,122) (399)
Changes in cash flow hedge reserve (251) 875 233
Deferred tax liability (asset) (362) (1,227) € 991
Deferred tax asset 209 365  
Deferred tax asset recognised € 1,055 € 1,731  
Weighted average statutory tax rate 22.70% 27.50% 24.70%
Effective tax rate 27.50% 29.60% 27.50%
Poland      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liability (asset) € 124 € 167  
Deferred tax asset recognised 120 224  
Unused tax losses carried forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax expense (income) recognised in profit or loss (128) 137  
Deferred tax liability (asset) 209 327 € 199
Net deferred tax      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liability (asset)   (1,227) 991
Net deferred tax | Unused tax losses carried forward      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax liability due to recapture of previously deducted tax losses 0 (37)  
Cash flow hedges      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax expense (income) recognised in profit or loss  
Changes in cash flow hedge reserve (251)    
Deferred tax liability (asset) 502 752 (126)
Financial assets and liabilities at FVPL      
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]      
Deferred tax expense (income) recognised in profit or loss 1,264 (3,493)  
Deferred tax liability (asset) € (1,461) € (2,739) € 746