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Derivative Financial Instruments and Risk Management Policies - Evolution of Hedges in Equity Narrative (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about hedging instruments [line items]    
Transfer to the income statement of the period - the hedged item has affected profit or loss € (649) € 53
Derivative instruments | Cash flow hedges | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Transfer to the income statement of the period - the hedged item has affected profit or loss 7 32
Derivative instruments | Cash flow hedges | Foreign currency exchange risk    
Disclosure of detailed information about hedging instruments [line items]    
Transfer to the income statement of the period - the hedged item has affected profit or loss (710) 19
Interest expenses | Derivative instruments | Cash flow hedges | Interest rate risk    
Disclosure of detailed information about hedging instruments [line items]    
Transfer to the income statement of the period - the hedged item has affected profit or loss 229 240
Interest expenses | Derivative instruments | Cash flow hedges | Foreign currency exchange risk    
Disclosure of detailed information about hedging instruments [line items]    
Transfer to the income statement of the period - the hedged item has affected profit or loss € 633 € (324)