v3.26.1
Financial instruments carried at fair value - Financial instruments classified in Level 3 and quantitative information about unobservable inputs (Detail) - Valuation
technique
unobservable
parameters
(Level 3)
€ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2026
EUR (€)
Dec. 31, 2025
EUR (€)
Price | Price based | Bottom of range    
Financial instruments held at fair value - Non-Derivative financial instruments held at fair value: Mortgage and other asset backed securities held for trading:    
Commercial mortgage backed securities, significant unobservable input, percent 0.00% [1] 0.00% [2]
Mortgage and other asset-backed securities, significant unobservable input, percent 0.00% [1] 0.00% [2]
Debt securities and other debt obligations    
Debt securities and other debt obligations, significant unobservable input, percent 0.00% [1] 0.00% [2]
Equity securities    
Equity securities, significant unobservable input, percent 0.00% [1] 0.00% [2]
Loans, at fair value    
Loans, significant unobservable input, percent 0.00% [1] 0.00% [2]
Price | Price based | Top of range    
Financial instruments held at fair value - Non-Derivative financial instruments held at fair value: Mortgage and other asset backed securities held for trading:    
Commercial mortgage backed securities, significant unobservable input, percent 101.00% [1] 101.00% [2]
Mortgage and other asset-backed securities, significant unobservable input, percent 105.00% [1] 105.00% [2]
Debt securities and other debt obligations    
Debt securities and other debt obligations, significant unobservable input, percent 1007.00% [1] 300.00% [2]
Equity securities    
Equity securities, significant unobservable input, percent 75.00% [1] 2500.00% [2]
Loans, at fair value    
Loans, significant unobservable input, percent 167.00% [1] 300.00% [2]
Price | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, absolute   0
Other derivatives, significant unobservable input, percent  
Price | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, absolute   6.77
Other derivatives, significant unobservable input, percent  
Credit spread (bps) | Discounted cash flow | Bottom of range    
Financial instruments held at fair value - Non-Derivative financial instruments held at fair value: Mortgage and other asset backed securities held for trading:    
Commercial mortgage backed securities, significant unobservable input, absolute 0.0109 [1] 0.0194 [2]
Mortgage and other asset-backed securities, significant unobservable input, absolute 0.0067 [1] 0.0098 [2]
Debt securities and other debt obligations    
Debt securities and other debt obligations, significant unobservable input, absolute 0.0052 [1] 0.0005 [2]
Loans, at fair value    
Loans, significant unobservable input, absolute 0.0010 [1] 0.0094 [2]
Loan commitments    
Loan commitments, significant unobservable input, absolute 0.0157 [1] 0.0153 [2]
Credit spread (bps) | Discounted cash flow | Top of range    
Financial instruments held at fair value - Non-Derivative financial instruments held at fair value: Mortgage and other asset backed securities held for trading:    
Commercial mortgage backed securities, significant unobservable input, absolute 0.0881 [1] 0.1019 [2]
Mortgage and other asset-backed securities, significant unobservable input, absolute 0.0877 [1] 0.1166 [2]
Debt securities and other debt obligations    
Debt securities and other debt obligations, significant unobservable input, absolute 0.0452 [1] 0.0696 [2]
Loans, at fair value    
Loans, significant unobservable input, absolute 0.3115 [1] 0.3106 [2]
Loan commitments    
Loan commitments, significant unobservable input, absolute 0.0984 [1] 0.0978 [2]
Credit spread (bps) | Discounted cash flow | Bottom of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, absolute   0.0201
Credit derivatives, significant unobservable input, absolute 0.0001 0.0012
Other derivatives, significant unobservable input, absolute 0.0230  
Credit spread (bps) | Discounted cash flow | Top of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, absolute   0.0568
Credit derivatives, significant unobservable input, absolute 0.3095 0.1277
Other derivatives, significant unobservable input, absolute 0.0717  
Recovery rate | Discounted cash flow | Bottom of range    
Financial instruments held at fair value - Non-Derivative financial instruments held at fair value: Mortgage and other asset backed securities held for trading:    
Mortgage and other asset-backed securities, significant unobservable input, percent 20.00% [1] 7.00% [2]
Loans, at fair value    
Loans, significant unobservable input, absolute 0.40 [1] 0.40 [2]
Loan commitments    
Loan commitments, significant unobservable input, percent 70.00% [1] 70.00% [2]
Recovery rate | Discounted cash flow | Top of range    
Financial instruments held at fair value - Non-Derivative financial instruments held at fair value: Mortgage and other asset backed securities held for trading:    
Mortgage and other asset-backed securities, significant unobservable input, percent 85.00% [1] 85.00% [2]
Loans, at fair value    
Loans, significant unobservable input, absolute 0.84 [1] 0.75 [2]
Loan commitments    
Loan commitments, significant unobservable input, percent 84.00% [1] 84.00% [2]
Recovery rate | Discounted cash flow | Bottom of range    
Market values from derivative financial
instruments:    
Credit derivatives, significant unobservable input, percent 15.00% 15.00%
Recovery rate | Discounted cash flow | Top of range    
Market values from derivative financial
instruments:    
Credit derivatives, significant unobservable input, percent 82.00% 94.00%
Constant default rate | Discounted cash flow | Bottom of range    
Financial instruments held at fair value - Non-Derivative financial instruments held at fair value: Mortgage and other asset backed securities held for trading:    
Mortgage and other asset-backed securities, significant unobservable input, percent 0.00% [1] 0.00% [2]
Constant default rate | Discounted cash flow | Top of range    
Financial instruments held at fair value - Non-Derivative financial instruments held at fair value: Mortgage and other asset backed securities held for trading:    
Mortgage and other asset-backed securities, significant unobservable input, percent 4.00% [1] 4.00% [2]
Constant default rate | Discounted cash flow | Bottom of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent 2.00% 1.00%
Constant default rate | Discounted cash flow | Top of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent 5.00% 11.00%
Constant prepayment rate | Discounted cash flow | Bottom of range    
Financial instruments held at fair value - Non-Derivative financial instruments held at fair value: Mortgage and other asset backed securities held for trading:    
Mortgage and other asset-backed securities, significant unobservable input, percent 1.00% [1] 1.00% [2]
Constant prepayment rate | Discounted cash flow | Top of range    
Financial instruments held at fair value - Non-Derivative financial instruments held at fair value: Mortgage and other asset backed securities held for trading:    
Mortgage and other asset-backed securities, significant unobservable input, percent 30.00% [1] 37.00% [2]
Constant prepayment rate | Discounted cash flow | Bottom of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent 3.00% 2.00%
Constant prepayment rate | Discounted cash flow | Top of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent 7.00% 16.00%
Price per net asset value | Market approach | Bottom of range    
Equity securities    
Equity securities, significant unobservable input, percent 0.00% [1] 0.00% [2]
Price per net asset value | Market approach | Top of range    
Equity securities    
Equity securities, significant unobservable input, percent 100.00% [1] 100.00% [2]
Enterprise value/EBITDA
(multiple) | Market approach | Bottom of range    
Equity securities    
Equity securities, significant unobservable input, absolute 1 [1] 1 [2]
Enterprise value/EBITDA
(multiple) | Market approach | Top of range    
Equity securities    
Equity securities, significant unobservable input, absolute 14 [1] 14 [2]
Enterprise value/Revenue (multiple) | Market approach | Bottom of range    
Equity securities    
Equity securities, significant unobservable input, absolute 4 [1] 4 [2]
Enterprise value/Revenue (multiple) | Market approach | Top of range    
Equity securities    
Equity securities, significant unobservable input, absolute 8 [1] 14 [2]
Weighted average cost capital | Discounted cash flow | Bottom of range    
Equity securities    
Equity securities, significant unobservable input, percent 9.00% [1] 9.00% [2]
Weighted average cost capital | Discounted cash flow | Top of range    
Equity securities    
Equity securities, significant unobservable input, percent 20.00% [1] 20.00% [2]
Utilization | Loan pricing model | Bottom of range    
Loan commitments    
Loan commitments, significant unobservable input, percent 0.00% [1] 0.00% [2]
Utilization | Loan pricing model | Top of range    
Loan commitments    
Loan commitments, significant unobservable input, percent 100.00% [1] 100.00% [2]
IRR | Discounted cash flow | Bottom of range    
Other financial instruments [Abstract]    
Other financial instruments, significant unobservable input, percent 7.00% [1] 7.00% [2]
IRR | Discounted cash flow | Top of range    
Other financial instruments [Abstract]    
Other financial instruments, significant unobservable input, percent 13.00% [1] 13.00% [2]
Repo rate (bps) | Discounted cash flow | Bottom of range    
Other financial instruments [Abstract]    
Other financial instruments, significant unobservable input, absolute 0 [1] 0.0008 [2]
Repo rate (bps) | Discounted cash flow | Top of range    
Other financial instruments [Abstract]    
Other financial instruments, significant unobservable input, absolute 0.0350 [1] 0.0285 [2]
Swap rate (bps) | Discounted cash flow | Bottom of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, absolute (0.1245) (0.0720)
FX derivatives, significant unobservable input, absolute (0.0014) (0.0002)
Swap rate (bps) | Discounted cash flow | Top of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, absolute 0.4085 0.3818
FX derivatives, significant unobservable input, absolute 0.0100 0.0100
Inflation swap rate | Discounted cash flow | Bottom of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent 0.00% 0.00%
Inflation swap rate | Discounted cash flow | Top of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent 9.00% 8.00%
Inflation volatility | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent 0.00% 0.00%
Inflation volatility | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent 7.00% 8.00%
Interest rate volatility | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent 0.00% 0.00%
Interest rate volatility | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent 3.00% 2.00%
IR - IR correlation | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent (25.00%) (10.00%)
IR - IR correlation | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent 96.00% 95.00%
Hybrid correlation | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent (56.00%) (56.00%)
Hybrid correlation | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, percent 95.00% 95.00%
Credit volatility | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Credit derivatives, significant unobservable input, percent 5.00% 5.00%
Credit volatility | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Credit derivatives, significant unobservable input, percent 90.00% 90.00%
Credit correlation | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Credit derivatives, significant unobservable input, percent   0.00%
Credit correlation | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Credit derivatives, significant unobservable input, percent   0.00%
Credit correlation | Correlation pricing
model | Bottom of range    
Market values from derivative financial
instruments:    
Credit derivatives, significant unobservable input, percent  
Credit correlation | Correlation pricing
model | Top of range    
Market values from derivative financial
instruments:    
Credit derivatives, significant unobservable input, percent  
Stock volatility | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Equity derivatives, significant unobservable input, percent 46.00% 1.00%
Stock volatility | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Equity derivatives, significant unobservable input, percent 68.00% 101.00%
Index volatility | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, absolute   0
Equity derivatives, significant unobservable input, percent 2.00% 6.00%
Other derivatives, significant unobservable input, percent 1.00%  
Index volatility | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, absolute   1.16
Equity derivatives, significant unobservable input, percent 49.00% 17.00%
Other derivatives, significant unobservable input, percent 110.00%  
Index - index correlation | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Equity derivatives, significant unobservable input, percent 0.00%
Index - index correlation | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Equity derivatives, significant unobservable input, percent 0.00%
Stock - stock correlation | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Equity derivatives, significant unobservable input, percent 0.00%
Stock - stock correlation | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Equity derivatives, significant unobservable input, percent 0.00%
Stock Forwards | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Equity derivatives, significant unobservable input, percent 0.00% 0.00%
Stock Forwards | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Equity derivatives, significant unobservable input, percent 1.00% 5.00%
Index Forwards | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Equity derivatives, significant unobservable input, percent 0.00% 0.00%
Index Forwards | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Equity derivatives, significant unobservable input, percent 10.00% 6.00%
Volatility | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
FX derivatives, significant unobservable input, percent (15.00%) (9.00%)
Volatility | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
FX derivatives, significant unobservable input, percent 47.00% 57.00%
Quoted Vol | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
FX derivatives, significant unobservable input, percent 0.00%
Quoted Vol | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
FX derivatives, significant unobservable input, percent 0.00%
Commodity correlation | Option pricing model | Bottom of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, absolute   (0.22)
Other derivatives, significant unobservable input, percent 42.00%  
Commodity correlation | Option pricing model | Top of range    
Market values from derivative financial
instruments:    
Interest rates derivatives, significant unobservable input, absolute   0.98
Other derivatives, significant unobservable input, percent 87.00%  
Fair value | Fair value | Financial assets designated at fair value through profit or loss    
Debt securities and other debt obligations    
Debt securities and other debt
obligations € 0  
Fair value | Fair value | Financial liabilities designated at fair value through profit or loss    
Debt securities and other debt obligations    
Debt securities and other debt
obligations 4,644  
Fair value | Fair value | Financial assets at fair value through other comprehensive income    
Debt securities and other debt obligations    
Debt securities and other debt
obligations 462  
Assets | Fair value | Fair value    
Financial instruments held at fair value - Non-Derivative financial instruments held at fair value: Mortgage and other asset backed securities held for trading:    
Commercial mortgage-backed securities 55 € 42
Mortgage and other asset-backed securities 84 91
Total mortgage- and other asset-backed
securities 139 133
Debt securities and other debt obligations    
Debt securities and other debt
obligations 5,950 5,320
Loans, at fair value    
Loans 11,436 11,293
Loan commitments    
Loan commitments 0
Other financial instruments [Abstract]    
Other financial instruments 1,146 [3] 1,172 [4]
Total non-derivative financial
instruments held at fair value 19,396 18,734
Market values from derivative financial
instruments:    
Interest rate derivatives 4,187 3,798
Credit derivatives 706 556
Equity derivatives 484 481
FX derivatives 1,519 1,523
Other derivatives 696 673
Total market values from derivative financial instruments 7,592 7,030
Assets | Valuation technique unobservable parameters (Level 3) | Valuation technique unobservable parameters (Level 3)    
Equity securities    
Equity securities 725 816
Liabilities | Fair value | Fair value    
Financial instruments held at fair value - Non-Derivative financial instruments held at fair value: Mortgage and other asset backed securities held for trading:    
Commercial mortgage-backed securities 0
Mortgage and other asset-backed securities 0
Total mortgage- and other asset-backed
securities 0 0
Debt securities and other debt obligations    
Debt securities and other debt
obligations 4,662 5,503
Loans, at fair value    
Loans 32 2
Loan commitments    
Loan commitments 4 2
Other financial instruments [Abstract]    
Other financial instruments 0 61 [5]
Total non-derivative financial
instruments held at fair value 4,701 5,572
Market values from derivative financial
instruments:    
Interest rate derivatives 2,872 2,950
Credit derivatives 611 603
Equity derivatives 619 572
FX derivatives 1,107 1,561
Other derivatives 367 [6] 289 [7]
Total market values from derivative financial instruments 5,576 5,974
Liabilities | Valuation technique unobservable parameters (Level 3) | Valuation technique unobservable parameters (Level 3)    
Equity securities    
Equity securities 3 4
Assets: Held for trading | Fair value | Fair value    
Debt securities and other debt obligations    
Debt securities and other debt
obligations 4,125 3,447
Corporate, sovereign and other
debt securities 4,125 3,447
Loans, at fair value    
Loans 7,317 6,913
Assets: Held for trading | Valuation technique unobservable parameters (Level 3) | Valuation technique unobservable parameters (Level 3)    
Equity securities    
Equity securities 76 55
Trading financial liabilities at fair value through profit or loss | Fair value | Fair value    
Debt securities and other debt obligations    
Debt securities and other debt
obligations 19 19
Loans, at fair value    
Loans 32 2
Trading financial liabilities at fair value through profit or loss | Valuation technique unobservable parameters (Level 3) | Valuation technique unobservable parameters (Level 3)    
Equity securities    
Equity securities 3 4
Non-trading financial assets mandatory at fair value through profit or loss | Fair value | Fair value    
Debt securities and other debt obligations    
Debt securities and other debt
obligations 1,362 1,474
Loans, at fair value    
Loans 1,917 2,490
Non-trading financial assets mandatory at fair value through profit or loss | Valuation technique unobservable parameters (Level 3) | Valuation technique unobservable parameters (Level 3)    
Equity securities    
Equity securities 649 761
Financial assets designated at fair value through profit or loss | Fair value | Fair value    
Debt securities and other debt obligations    
Debt securities and other debt
obligations   0
Loans, at fair value    
Loans 0 0
Financial liabilities designated at fair value through profit or loss | Fair value | Fair value    
Debt securities and other debt obligations    
Debt securities and other debt
obligations   5,484
Loans, at fair value    
Loans 0
Financial assets at fair value through other comprehensive income | Fair value | Fair value    
Debt securities and other debt obligations    
Debt securities and other debt
obligations   399
Loans, at fair value    
Loans € 2,202 € 1,890
[1] Valuation technique(s) and subsequently the significant unobservable input(s) relate to the respective total position
[2] Valuation technique(s) and subsequently the significant unobservable input(s) relate to the respective total position
[3] Other financial assets include € 135 million of other trading assets, € 984 million of other non-trading financial assets mandatory at fair value and € 27 million other
financial assets at fair value through other comprehensive income
[4] Other financial assets include € 157 million of other trading assets, € 1 billion of other non-trading financial assets mandatory at fair value, and € 59 million other financial
assets at fair value through other comprehensive income
[5] Other financial liabilities include € 61 million of securities sold under repurchase agreements designated at fair value
[6] Includes derivatives which are embedded in contracts where the host contract is held at amortized cost but for which the embedded derivative is separated
[7] Includes derivatives which are embedded in contracts where the host contract is held at amortized cost but for which the embedded derivative is separated