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Risk management - Foreign currency exposures banking books (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | € 15,834 | € 16,849
Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 29,509 | 28,024
Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (13,675) | (11,175)
US Dollar |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 6,429 | 6,921
US Dollar | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 11,251 | 10,337
US Dollar | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (4,823) | (3,416)
British Pound |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 1,190 | 1,503
British Pound | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 1,674 | 1,659
British Pound | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (484) | (156)
Polish Zloty |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 2,677 | 2,722
Polish Zloty | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 4,292 | 3,976
Polish Zloty | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (1,616) | (1,254)
Australian Dollar |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 1,212 | 1,346
Australian Dollar | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 3,373 | 3,620
Australian Dollar | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (2,161) | (2,273)
Turkish Lira |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 557 | 517
Turkish Lira | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 557 | 517
Turkish Lira | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 0 | 0
Chinese Yuan |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 1,609 | 1,466
Chinese Yuan | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 2,439 | 1,815
Chinese Yuan | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (830) | (348)
Russian Rouble |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 396 | 375
Russian Rouble | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 396 | 375
Russian Rouble | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 0 | 0
Romanian Leu |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 736 | 761
Romanian Leu | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 913 | 895
Romanian Leu | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (176) | (134)
Thai Baht |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 428 | 431
Thai Baht | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 1,266 | 1,128
Thai Baht | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (838) | (697)
Other currency |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 599 | 806
Other currency | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 3,346 | 3,704
Other currency | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | € (2,748) | € (2,897)

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