Financial liabilities - Disclosure of reconciliation of debt instruments (Details) - EUR (€) € in Millions	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Changes in financial instruments, Liabilities
Perimeter	€ (285)
Bonds and debentures outstanding
Changes in financial instruments, Liabilities
Balance at beginning of period	252,765	€ 231,880
Perimeter	0	(1,224)
Issuances or placements	37,180	41,185
Repurchases or redemptions	(32,874)	(32,172)
Exchange rate and other adjustments	(12,180)	27
Balance at end of period	244,891	239,696
Subordinated
Changes in financial instruments, Liabilities
Balance at beginning of period	35,461	30,529
Perimeter	0	0
Issuances or placements	278	3,908
Repurchases or redemptions	(3,147)	(2,422)
Exchange rate and other adjustments	(1,641)	96
Balance at end of period	30,951	32,111
Bonds and debentures and subordinated liabilities
Changes in financial instruments, Liabilities
Balance at beginning of period	288,226	262,409
Perimeter	0	(1,224)
Issuances or placements	37,458	45,093
Repurchases or redemptions	(36,021)	(34,594)
Exchange rate and other adjustments	(13,821)	123
Balance at end of period	€ 275,842	€ 271,807

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]]

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