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Financial Assets at Fair Value through Other Comprehensive Income (Detail) - Financial assets at fair value through OCI - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Financial assets at fair value through OCI [Line Items]    
Securities purchased under resale agreement € 1,128 € 2,786
Debt securities:    
German government 4,231 2,006
U.S. Treasury and U.S. government agencies 9,654 10,640
U.S. local (municipal) governments 1,359 719
Other foreign governments 19,692 18,661
Corporates 201 189
Other asset-backed securities 0 0
Mortgage-backed securities, including obligations of U.S. federal agencies 463 414
Other debt securities 2,484 1,607
Debt securities 38,084 34,236
Loans 4,432 5,068
Total financial assets at fair value through other comprehensive income € 43,644 € 42,090