Explanatory notes to the Consolidated Statements of Cash Flows - Disclosure of reconciliation of liabilities arising from financing activities (Details) - EUR (€) € in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flows Explanatory Notes [Abstract]
Borrowings	€ 37,227	€ 29,463	€ 27,153
Derivative (assets)/liabilities and collateral	(409)	(109)	(67)
Securities and financial receivables	(6,046)	(9,357)	(4,176)
Total Liabilities from financing activities at January 1	30,772	19,997	€ 22,910
Changes in liabilities arising from financing activities [abstract]
Cash flows	9,623	(2,640)
Foreign exchange effects	12	(250)
Fair value changes	85	468
Changes in scope of consolidation	350	955
Transfer to (assets)/liabilities held for sale	(10)	(122)
Other changes	€ 715	€ (1,324)

The amount of outstanding funds that the entity is obligated to repay.

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The increase (decrease) in liabilities arising from financing activities resulting from changes in fair values. [Refer: Liabilities arising from financing activities]

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The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities]

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The increase (decrease) in liabilities arising from financing activities resulting from financing cash flows. [Refer: Cash flows from (used in) financing activities; Liabilities arising from financing activities]

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The increase (decrease) in liabilities arising from financing activities resulting from obtaining or losing control of subsidiaries or other businesses. [Refer: Liabilities arising from financing activities; Total for all subsidiaries [member]]

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The increase (decrease) in liabilities arising from financing activities resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Liabilities arising from financing activities]

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The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities]

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Cash Flows Explanatory Notes

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Debt Securities Arising From Financial Activites

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Derivative Financial Assets (Liabilities) And Collateral Arising From Financial Activites

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Increase (Decrease) Through Transfer To (Assets) Liabilities Held For Sale, Liabilities Arising From Financing Activities

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