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Note 6 Wholesale financing operations carried out by group entities (Details) € in Millions	Jun. 30, 2023 EUR (€)
Jan-23 [Member] \| 4.625% [Member] \| Jan-30 [Member] \| Jan-31 [Member]
Type of issue [Line Items]
Senior non-preferred	€ 1,000
Jan-23 [Member] \| 3.125% [Member] \| Jul-27 [Member]
Type of issue [Line Items]
Covered bonds	1,500
May-23 [Member] \| 4.125% [Member] \| May-25 [Member] \| May-26 [Member]
Type of issue [Line Items]
Senior preferred	1,000
Jun-23 [Member] \| Midswap +280 basis points [Member] \| Jun-Sep 28 [Member] \| Sep-33 [Member]
Type of issue [Line Items]
Tier 2	750
Jun-23 [Member] \| 8.375% [Member] \| Dec-28 [Member] \| Perpetual [Member]
Type of issue [Line Items]
AT 1	€ 1,000