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Derivative Financial Instruments and Risk Management Policies - Evolution of Hedges in Equity Narrative (Details) - EUR (€) € in Millions | 12 Months Ended
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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)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Hedges in Equity, Increase (Decrease) from Transfer to Income Statement, Affected Profit or Loss + References No definition available. + Details
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