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, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash Flows Explanatory Notes [Abstract]
Borrowings	€ 45,947	€ 37,227	€ 29,463
Derivative (assets)/liabilities and collateral	(288)	(409)	(109)
Total Liabilities from financing activities at January 1	45,659	36,818	€ 29,354
Changes in liabilities arising from financing activities [abstract]
Cash flows	9,489	6,219
Foreign exchange effects	(2,252)	12
Fair value changes	2	85
Changes in scope of consolidation	229	350
Transfer to (assets)/liabilities held for sale	(61)	(10)
Other changes	€ 1,434	€ 808

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 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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