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Risk management - Foreign currency exposures banking books (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | € 16,849 | € 17,892
Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 28,024 | 27,081
Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (11,175) | (9,189)
US Dollar |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 6,921 | 8,093
US Dollar | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 10,337 | 10,470
US Dollar | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (3,416) | (2,376)
Pound Sterling |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 1,503 | 1,306
Pound Sterling | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 1,659 | 1,364
Pound Sterling | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (156) | (58)
Polish Zloty |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 2,722 | 2,393
Polish Zloty | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 3,976 | 2,714
Polish Zloty | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (1,254) | (321)
Australian Dollar |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 1,346 | 1,108
Australian Dollar | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 3,620 | 3,781
Australian Dollar | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (2,273) | (2,673)
Turkish Lira |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 517 | 750
Turkish Lira | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 517 | 750
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 | 1,466 | 1,871
Chinese Yuan | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 1,815 | 1,871
Chinese Yuan | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (348) | 0
Russian Rouble |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 375 | 392
Russian Rouble | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 375 | 391
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 | 761 | 706
Romanian Leu | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 895 | 860
Romanian Leu | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (134) | (154)
Thai Baht |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 431 | 410
Thai Baht | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 1,128 | 1,109
Thai Baht | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | (697) | (699)
Other currency |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 806 | 863
Other currency | Foreign Investments |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | 3,704 | 3,771
Other currency | Hedges |  |
Trading income (expense) [line items] |  |
Net banking currency exposures banking books | € (2,897) | € (2,908)

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