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Accounting Policies - Lack of Exchangeability (Details) - Increase (decrease) due to changes in accounting policy required by IFRSs, cumulative effect at date of initial application
€ in Millions
Jan. 01, 2024
EUR (€)
Disclosure of voluntary change in accounting policy [line items]  
Adjustment on initial application of new reporting (Note 17) € 142
Retained earnings  
Disclosure of voluntary change in accounting policy [line items]  
Adjustment on initial application of new reporting (Note 17) (224)
Translation differences  
Disclosure of voluntary change in accounting policy [line items]  
Adjustment on initial application of new reporting (Note 17) € 366