v3.25.4
Income Taxes - Major Components of Gross Deferred Income Tax Assets and Liabilities (Detail) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Deferred tax assets pre-offsetting    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting € 12,489 € 14,023
Deferred tax assets pre-offsetting | Unused tax losses    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting 2,720 3,966
Deferred tax assets pre-offsetting | Unused tax credits    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting 326 172
Deferred tax assets pre-offsetting | Trading activities, including derivatives    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting 3,154 3,634
Deferred tax assets pre-offsetting | Employee benefits, including equity settled share based payments    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting 1,814 1,755
Deferred tax assets pre-offsetting | Accrued interest expense    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting 1,621 1,477
Deferred tax assets pre-offsetting | Loans and borrowings, including allowance for loans    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting 886 846
Deferred tax assets pre-offsetting | Leases    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting 806 857
Deferred tax assets pre-offsetting | Intangible Assets    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting 46 52
Deferred tax assets pre-offsetting | Fair value OCI (IFRS 9)    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting 410 496
Deferred tax assets pre-offsetting | Other assets    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting 525 525
Deferred tax assets pre-offsetting | Other provisions    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting 177 237
Deferred tax assets pre-offsetting | Other liabilities    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax assets pre offsetting 4 6
Deferred tax liabilities pre-offsetting    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax liabilities pre offsetting 7,340 7,895
Deferred tax liabilities pre-offsetting | Trading activities, including derivatives    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax liabilities pre offsetting 4,432 4,874
Deferred tax liabilities pre-offsetting | Employee benefits, including equity settled share based payments    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax liabilities pre offsetting 515 324
Deferred tax liabilities pre-offsetting | Loans and borrowings, including allowance for loans    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax liabilities pre offsetting 465 538
Deferred tax liabilities pre-offsetting | Leases    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax liabilities pre offsetting 718 762
Deferred tax liabilities pre-offsetting | Intangible Assets    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax liabilities pre offsetting 763 752
Deferred tax liabilities pre-offsetting | Fair value OCI (IFRS 9)    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax liabilities pre offsetting 50 45
Deferred tax liabilities pre-offsetting | Other assets    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax liabilities pre offsetting 280 270
Deferred tax liabilities pre-offsetting | Other provisions    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax liabilities pre offsetting 111 292
Deferred tax liabilities pre-offsetting | Other liabilities    
Major components of gross deferred tax assets and liabilities [Line Items]    
Total deferred tax liabilities pre offsetting € 6 € 38