v3.25.4
Risk management - Gross carrying amount per IFRS 9 stage and rating class (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of credit risk exposure [line items]      
Other € 11,989.0 € 12,369.0  
Undrawn commitments      
Disclosure of credit risk exposure [line items]      
Undrawn borrowing facilities 200,000.0 156,000.0  
Other positions      
Disclosure of credit risk exposure [line items]      
Other 0.0 6,000.0  
Non IFRS 9 eligible assets commitments      
Disclosure of credit risk exposure [line items]      
Other 68,000.0 75,000.0  
Gross carrying amount | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets 1,135,409.0 1,048,574.0 € 1,025,043.0
Increase (decrease) through changes in models or risk parameters, financial assets  
Gross carrying amount | Stage 3: Lifetime Expected Credit Losses | Purchased credit impaired      
Disclosure of credit risk exposure [line items]      
Financial assets (29.0) (21.0)  
Gross carrying amount | Lifetime expected credit losses | Credit impaired | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets 13,590.0 13,742.0 11,956.0
Increase (decrease) through changes in models or risk parameters, financial assets  
Gross carrying amount | Lifetime expected credit losses | Not credit-impaired | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets 77,487.0 79,888.0 75,454.0
Increase (decrease) through changes in models or risk parameters, financial assets  
Gross carrying amount | Stage 1      
Disclosure of credit risk exposure [line items]      
Percentage of financial assets 92.00% 91.10%  
Gross carrying amount | Stage 2      
Disclosure of credit risk exposure [line items]      
Percentage of financial assets 6.80% 7.60%  
Increase (decrease) through changes in models or risk parameters, financial assets € 2,400.0    
Gross carrying amount | Stage 2 | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets 77,500.0 € 79,900.0  
Gross carrying amount | Stage 2 | Lifetime expected credit losses | Not credit-impaired | Loans      
Disclosure of credit risk exposure [line items]      
Increase (decrease) through net transfers, financial assets 15,700.0    
Increase (decrease) through net level three transfers, financial assets € 1,200.0    
Gross carrying amount | Stage 3      
Disclosure of credit risk exposure [line items]      
Percentage of financial assets 1.20% 1.30%  
Gross carrying amount | Stage 3 | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets € 13,600.0 € 13,700.0  
Increase (decrease) through changes in models or risk parameters, financial assets 200.0    
Gross carrying amount | Stage 3 | Credit impaired | Loans      
Disclosure of credit risk exposure [line items]      
Decrease through derecognition and repayments financial assets 2,300.0    
Decrease through write-offs and disposals, financial assets 1,500.0    
Gross carrying amount | Stage 3 | Credit impaired | Loans | Of which: non-performing      
Disclosure of credit risk exposure [line items]      
Increase (decrease) through changes in models or risk parameters, financial assets (3,500.0)    
Provisions      
Disclosure of credit risk exposure [line items]      
Financial assets (6,101.0) (6,049.0)  
Provisions | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets (6,101.0) (6,049.0) (5,839.0)
Increase (decrease) through changes in models or risk parameters, financial assets 3.0 (20.0)  
Provisions | Lifetime expected credit losses | Purchased credit impaired | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets (29.0) (21.0)  
Provisions | Lifetime expected credit losses | Credit impaired | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets (4,476.0) (4,509.0) (3,887.0)
Increase (decrease) through changes in models or risk parameters, financial assets (35.0) (22.0)  
Provisions | Lifetime expected credit losses | Not credit-impaired | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets (1,179.0) (1,130.0) € (1,435.0)
Increase (decrease) through changes in models or risk parameters, financial assets 71.0 (6.0)  
Provisions | Stage 2 | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets (1,200.0)    
Increase (decrease) due to sales and repayments, financial assets 18,100.0    
Increase provision, net 49.3    
Provisions | Stage 3 | Loans      
Disclosure of credit risk exposure [line items]      
Financial assets, increase in provisions 33.0    
IFRS 9 | Gross carrying amount      
Disclosure of credit risk exposure [line items]      
Financial assets 1,135,409.0 1,048,574.0  
IFRS 9 | Gross carrying amount | 1 (AAA)      
Disclosure of credit risk exposure [line items]      
Financial assets 80,064.0 79,357.0  
IFRS 9 | Gross carrying amount | 2-4 (AA)      
Disclosure of credit risk exposure [line items]      
Financial assets 148,315.0 142,250.0  
IFRS 9 | Gross carrying amount | 5-7 (A)      
Disclosure of credit risk exposure [line items]      
Financial assets 305,093.0 251,149.0  
IFRS 9 | Gross carrying amount | 8-10 (BBB)      
Disclosure of credit risk exposure [line items]      
Financial assets 354,012.0 335,008.0  
IFRS 9 | Gross carrying amount | 11-13 (BB)      
Disclosure of credit risk exposure [line items]      
Financial assets 173,589.0 172,827.0  
IFRS 9 | Gross carrying amount | 14-16 (B)      
Disclosure of credit risk exposure [line items]      
Financial assets 48,855.0 42,811.0  
IFRS 9 | Gross carrying amount | 17 (CCC)      
Disclosure of credit risk exposure [line items]      
Financial assets 5,094.0 4,897.0  
IFRS 9 | Gross carrying amount | 18 (CC)      
Disclosure of credit risk exposure [line items]      
Financial assets 4,349.0 4,060.0  
IFRS 9 | Gross carrying amount | 19 (C)      
Disclosure of credit risk exposure [line items]      
Financial assets 2,447.0 2,474.0  
IFRS 9 | Gross carrying amount | 20-22 (D)      
Disclosure of credit risk exposure [line items]      
Financial assets 13,590.0 13,742.0  
IFRS 9 | Gross carrying amount | Stage 1      
Disclosure of credit risk exposure [line items]      
Financial assets 1,044,332.0 954,943.0  
IFRS 9 | Gross carrying amount | Stage 1 | 1 (AAA)      
Disclosure of credit risk exposure [line items]      
Financial assets 79,938.0 79,076.0  
IFRS 9 | Gross carrying amount | Stage 1 | 2-4 (AA)      
Disclosure of credit risk exposure [line items]      
Financial assets 146,878.0 140,671.0  
IFRS 9 | Gross carrying amount | Stage 1 | 5-7 (A)      
Disclosure of credit risk exposure [line items]      
Financial assets 299,699.0 244,241.0  
IFRS 9 | Gross carrying amount | Stage 1 | 8-10 (BBB)      
Disclosure of credit risk exposure [line items]      
Financial assets 334,845.0 310,324.0  
IFRS 9 | Gross carrying amount | Stage 1 | 11-13 (BB)      
Disclosure of credit risk exposure [line items]      
Financial assets 156,373.0 154,348.0  
IFRS 9 | Gross carrying amount | Stage 1 | 14-16 (B)      
Disclosure of credit risk exposure [line items]      
Financial assets 26,187.0 25,377.0  
IFRS 9 | Gross carrying amount | Stage 1 | 17 (CCC)      
Disclosure of credit risk exposure [line items]      
Financial assets 412.0 905.0  
IFRS 9 | Gross carrying amount | Stage 2      
Disclosure of credit risk exposure [line items]      
Financial assets 77,487.0 79,888.0  
IFRS 9 | Gross carrying amount | Stage 2 | 1 (AAA)      
Disclosure of credit risk exposure [line items]      
Financial assets 126.0 281.0  
IFRS 9 | Gross carrying amount | Stage 2 | 2-4 (AA)      
Disclosure of credit risk exposure [line items]      
Financial assets 1,437.0 1,579.0  
IFRS 9 | Gross carrying amount | Stage 2 | 5-7 (A)      
Disclosure of credit risk exposure [line items]      
Financial assets 5,394.0 6,908.0  
IFRS 9 | Gross carrying amount | Stage 2 | 8-10 (BBB)      
Disclosure of credit risk exposure [line items]      
Financial assets 19,168.0 24,683.0  
IFRS 9 | Gross carrying amount | Stage 2 | 11-13 (BB)      
Disclosure of credit risk exposure [line items]      
Financial assets 17,217.0 18,479.0  
IFRS 9 | Gross carrying amount | Stage 2 | 14-16 (B)      
Disclosure of credit risk exposure [line items]      
Financial assets 22,668.0 17,433.0  
IFRS 9 | Gross carrying amount | Stage 2 | 17 (CCC)      
Disclosure of credit risk exposure [line items]      
Financial assets 4,682.0 3,992.0  
IFRS 9 | Gross carrying amount | Stage 2 | 18 (CC)      
Disclosure of credit risk exposure [line items]      
Financial assets 4,349.0 4,059.0  
IFRS 9 | Gross carrying amount | Stage 2 | 19 (C)      
Disclosure of credit risk exposure [line items]      
Financial assets 2,447.0 2,474.0  
IFRS 9 | Gross carrying amount | Stage 3      
Disclosure of credit risk exposure [line items]      
Financial assets 13,590.0 13,742.0  
IFRS 9 | Gross carrying amount | Stage 3 | 20-22 (D)      
Disclosure of credit risk exposure [line items]      
Financial assets 13,590.0 13,742.0  
IFRS 9 | Provisions      
Disclosure of credit risk exposure [line items]      
Financial assets (6,101.0) (6,049.0)  
IFRS 9 | Provisions | 1 (AAA)      
Disclosure of credit risk exposure [line items]      
Financial assets (2.0) (1.0)  
IFRS 9 | Provisions | 2-4 (AA)      
Disclosure of credit risk exposure [line items]      
Financial assets (13.0) (11.0)  
IFRS 9 | Provisions | 5-7 (A)      
Disclosure of credit risk exposure [line items]      
Financial assets (45.0) (29.0)  
IFRS 9 | Provisions | 8-10 (BBB)      
Disclosure of credit risk exposure [line items]      
Financial assets (119.0) (110.0)  
IFRS 9 | Provisions | 11-13 (BB)      
Disclosure of credit risk exposure [line items]      
Financial assets (254.0) (281.0)  
IFRS 9 | Provisions | 14-16 (B)      
Disclosure of credit risk exposure [line items]      
Financial assets (504.0) (490.0)  
IFRS 9 | Provisions | 17 (CCC)      
Disclosure of credit risk exposure [line items]      
Financial assets (228.0) (181.0)  
IFRS 9 | Provisions | 18 (CC)      
Disclosure of credit risk exposure [line items]      
Financial assets (262.0) (233.0)  
IFRS 9 | Provisions | 19 (C)      
Disclosure of credit risk exposure [line items]      
Financial assets (198.0) (203.0)  
IFRS 9 | Provisions | 20-22 (D)      
Disclosure of credit risk exposure [line items]      
Financial assets (4,476.0) (4,509.0)  
IFRS 9 | Provisions | Stage 1      
Disclosure of credit risk exposure [line items]      
Financial assets (446.0) (409.0)  
IFRS 9 | Provisions | Stage 1 | 1 (AAA)      
Disclosure of credit risk exposure [line items]      
Financial assets (2.0) (1.0)  
IFRS 9 | Provisions | Stage 1 | 2-4 (AA)      
Disclosure of credit risk exposure [line items]      
Financial assets (11.0) (10.0)  
IFRS 9 | Provisions | Stage 1 | 5-7 (A)      
Disclosure of credit risk exposure [line items]      
Financial assets (39.0) (21.0)  
IFRS 9 | Provisions | Stage 1 | 8-10 (BBB)      
Disclosure of credit risk exposure [line items]      
Financial assets (77.0) (55.0)  
IFRS 9 | Provisions | Stage 1 | 11-13 (BB)      
Disclosure of credit risk exposure [line items]      
Financial assets (165.0) (190.0)  
IFRS 9 | Provisions | Stage 1 | 14-16 (B)      
Disclosure of credit risk exposure [line items]      
Financial assets (147.0) (124.0)  
IFRS 9 | Provisions | Stage 1 | 17 (CCC)      
Disclosure of credit risk exposure [line items]      
Financial assets (5.0) (8.0)  
IFRS 9 | Provisions | Stage 2      
Disclosure of credit risk exposure [line items]      
Financial assets (1,179.0) (1,130.0)  
IFRS 9 | Provisions | Stage 2 | 2-4 (AA)      
Disclosure of credit risk exposure [line items]      
Financial assets (1.0) (1.0)  
IFRS 9 | Provisions | Stage 2 | 5-7 (A)      
Disclosure of credit risk exposure [line items]      
Financial assets (6.0) (8.0)  
IFRS 9 | Provisions | Stage 2 | 8-10 (BBB)      
Disclosure of credit risk exposure [line items]      
Financial assets (43.0) (55.0)  
IFRS 9 | Provisions | Stage 2 | 11-13 (BB)      
Disclosure of credit risk exposure [line items]      
Financial assets (89.0) (91.0)  
IFRS 9 | Provisions | Stage 2 | 14-16 (B)      
Disclosure of credit risk exposure [line items]      
Financial assets (357.0) (366.0)  
IFRS 9 | Provisions | Stage 2 | 17 (CCC)      
Disclosure of credit risk exposure [line items]      
Financial assets (224.0) (173.0)  
IFRS 9 | Provisions | Stage 2 | 18 (CC)      
Disclosure of credit risk exposure [line items]      
Financial assets (262.0) (233.0)  
IFRS 9 | Provisions | Stage 2 | 19 (C)      
Disclosure of credit risk exposure [line items]      
Financial assets (198.0) (203.0)  
IFRS 9 | Provisions | Stage 3      
Disclosure of credit risk exposure [line items]      
Financial assets (4,476.0) (4,509.0)  
IFRS 9 | Provisions | Stage 3 | 20-22 (D)      
Disclosure of credit risk exposure [line items]      
Financial assets € (4,476.0) € (4,509.0)