v3.26.1
Note 7 Fair value of financial instruments at amortized cost by levels (Details) - EUR (€)
€ in Millions
Dec. 31, 2026
Jun. 30, 2026
Dec. 31, 2025
Fair value of financial instruments at amortized cost by levels [Line Items]      
Financial assets at amortised cost   € 627,627 € 568,893
Debt instruments held at amortised cost   73,703 73,379
Loans and advances at amortised cost € 495,513 553,924  
Financial liabilities at amortised cost   725,029 658,599
Deposits at amortised cost   596,535 556,498
Debt Securities at amortized cost   106,155 81,842
Other financial liabilities   22,339 20,258
Cash, cash balances at central banks and other demand deposits   64,016 58,837
Carrying amount presented as fair value [Member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Financial assets at amortised cost   46,147 [1] 40,224 [2]
Debt instruments held at amortised cost   0 [1] 0 [2]
Loans and advances at amortised cost   46,147 [1] 40,224 [2]
Financial liabilities at amortised cost   430,953 [1] 416,378 [2]
Deposits at amortised cost   408,614 [1] 396,119 [2]
Debt Securities at amortized cost   0 [1] 0 [2]
Other financial liabilities   22,339 [1] 20,258 [2]
Cash, cash balances at central banks and other demand deposits   64,016 [1] 58,837 [2]
Level 1 Of Fair Value Hierarchy [Member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Financial assets at amortised cost   64,965 65,255
Debt instruments held at amortised cost   64,965 65,255
Loans and advances at amortised cost 0 0  
Financial liabilities at amortised cost   48,362 42,578
Deposits at amortised cost   0 0
Debt Securities at amortized cost   48,362 42,578
Other financial liabilities   0 0
Cash, cash balances at central banks and other demand deposits   0 0
Level 2 Of Fair Value Hierarchy [Member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Financial assets at amortised cost   32,285 25,873
Debt instruments held at amortised cost   6,452 6,526
Loans and advances at amortised cost 19,347 25,833  
Financial liabilities at amortised cost   125,359 86,123
Deposits at amortised cost   68,495 49,084
Debt Securities at amortized cost   56,864 37,039
Other financial liabilities   0 0
Cash, cash balances at central banks and other demand deposits   0 0
Level 3 Of Fair Value Hierarchy [Member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Financial assets at amortised cost   482,747 437,577
Debt instruments held at amortised cost   1,745 1,322
Loans and advances at amortised cost 436,255 481,002  
Financial liabilities at amortised cost   121,306 115,369
Deposits at amortised cost   119,175 112,053
Debt Securities at amortized cost   2,132 3,316
Other financial liabilities   0 0
Cash, cash balances at central banks and other demand deposits   0 0
Aggregate of fair values [member]      
Fair value of financial instruments at amortized cost by levels [Line Items]      
Financial assets at amortised cost   626,145 568,929
Debt instruments held at amortised cost   73,163 73,103
Loans and advances at amortised cost € 495,826 552,983  
Financial liabilities at amortised cost   725,981 660,447
Deposits at amortised cost   596,284 557,256
Debt Securities at amortized cost   107,358 82,932
Other financial liabilities   22,339 20,258
Cash, cash balances at central banks and other demand deposits   € 64,016 € 58,837
[1]
(1) Financial instruments whose book value is presented as an approximation to their fair value, mainly short-term financial instruments.
[2]
(1) Financial instruments whose book value is presented as an approximation to their fair value, mainly short-term financial instruments.