v3.26.1
Hedging derivatives - Schedule of effectiveness of hedging, impacts on profit or loss and other comprehensive income (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
C) Designated elements      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result € 1,199 € 978 € 704
Ineffective recognised in the income statement 11 16 63
Reclassified amount of reserves to the income statement (706) (1,256) (2,622)
Fair value hedges      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 0 0 0
Ineffective recognised in the income statement 7 22 59
Fair value hedges | Interest rate risk      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 0 0 0
Ineffective recognised in the income statement (33) 30 72
Fair value hedges | Currency risk      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 0 0 0
Ineffective recognised in the income statement 3 (17) (38)
Fair value hedges | Interest rate and exchange rate risk      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 0 0 0
Ineffective recognised in the income statement (9) 9 25
Fair value hedges | Inflation risk      
Disclosure of detailed information about hedged items [line items]      
Ineffective recognised in the income statement 46    
Cash flow hedges      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 1,049 558 2,592
Cash flow hedges | C) Designated elements      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 1,063 558 2,592
Ineffective recognised in the income statement 4 (6) 4
Reclassified amount of reserves to the income statement (706) (1,256) (2,622)
Cash flow hedges | Interest rate risk      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 1,155 163 2,179
Cash flow hedges | Interest rate risk | C) Designated elements      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 1,174 163 2,179
Ineffective recognised in the income statement (3) (12) 2
Reclassified amount of reserves to the income statement (638) (1,166) (1,647)
Cash flow hedges | Currency risk      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result (229) 312 7
Cash flow hedges | Currency risk | C) Designated elements      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result (240) 312 7
Ineffective recognised in the income statement 7 20 (1)
Reclassified amount of reserves to the income statement 85 319 (416)
Cash flow hedges | Interest rate and exchange rate risk      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 8 155 164
Cash flow hedges | Interest rate and exchange rate risk | C) Designated elements      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 8 155 164
Ineffective recognised in the income statement (10) (14) 2
Reclassified amount of reserves to the income statement (233) (340) (431)
Cash flow hedges | Inflation risk      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 131 (70) 233
Reclassified amount of reserves to the income statement 80 (69) (128)
Cash flow hedges | Inflation risk | C) Designated elements      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 131 (70) 233
Ineffective recognised in the income statement 0 1
Reclassified amount of reserves to the income statement 80 (69) (128)
Cash flow hedges | Equity risk      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result (16) (2) 9
Cash flow hedges | Equity risk | C) Designated elements      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result (10) (2) 9
Ineffective recognised in the income statement 10 0 0
Reclassified amount of reserves to the income statement 0 0 0
Net foreign investments hedges      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 136 420 (1,888)
Net foreign investments hedges | C) Designated elements      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 136 420 (1,888)
Ineffective recognised in the income statement 0 0 0
Reclassified amount of reserves to the income statement 0 0 0
Net foreign investments hedges | Currency risk      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 136 420 (1,888)
Net foreign investments hedges | Currency risk | C) Designated elements      
Disclosure of detailed information about hedged items [line items]      
Earnings/(losses) recognised in another cumulative overall result 136 420 (1,888)
Ineffective recognised in the income statement 0 0 0
Reclassified amount of reserves to the income statement € 0 € 0 € 0