v3.25.4
Risk management - Sensitivity analysis (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Netherlands    
Market Risk [Line Items]    
Reportable ECL € 389 € 270
Netherlands | Upside scenario    
Market Risk [Line Items]    
Un-weighted ECL € 288 € 193
Probability weighting 20.00% 20.00%
Netherlands | Upside scenario | Real GDP    
Market Risk [Line Items]    
2026 2.60% 2.60%
2027 2.90% 3.00%
2028 2.30% 2.50%
Netherlands | Upside scenario | Unemployment    
Market Risk [Line Items]    
2026 3.50% 3.50%
2027 3.20% 3.30%
2028 3.20% 3.30%
Netherlands | Upside scenario | HPI    
Market Risk [Line Items]    
2026 8.20% 18.90%
2027 8.50% 11.70%
2028 7.00% 2.50%
Netherlands | Baseline scenario    
Market Risk [Line Items]    
Un-weighted ECL € 364 € 249
Probability weighting 60.00% 60.00%
Netherlands | Baseline scenario | Real GDP    
Market Risk [Line Items]    
2026 1.10% 1.50%
2027 1.40% 1.40%
2028 1.50% 1.50%
Netherlands | Baseline scenario | Unemployment    
Market Risk [Line Items]    
2026 4.00% 4.00%
2027 3.90% 4.10%
2028 4.10% 4.30%
Netherlands | Baseline scenario | HPI    
Market Risk [Line Items]    
2026 4.40% 9.10%
2027 3.00% 3.50%
2028 2.90% 2.40%
Netherlands | Downside scenario    
Market Risk [Line Items]    
Un-weighted ECL € 566 € 411
Probability weighting 20.00% 20.00%
Netherlands | Downside scenario | Real GDP    
Market Risk [Line Items]    
2026 (1.20%) (0.40%)
2027 (0.90%) (1.40%)
2028 0.20% (0.20%)
Netherlands | Downside scenario | Unemployment    
Market Risk [Line Items]    
2026 5.50% 5.70%
2027 6.50% 7.20%
2028 7.40% 8.10%
Netherlands | Downside scenario | HPI    
Market Risk [Line Items]    
2026 (0.80%) (3.70%)
2027 (5.10%) (7.20%)
2028 (5.10%) 2.20%
Germany    
Market Risk [Line Items]    
Reportable ECL € 633 € 548
Germany | Upside scenario    
Market Risk [Line Items]    
Un-weighted ECL € 584 € 510
Probability weighting 20.00% 20.00%
Germany | Upside scenario | Real GDP    
Market Risk [Line Items]    
2026 2.80% 2.00%
2027 3.00% 2.80%
2028 1.80% 1.60%
Germany | Upside scenario | Unemployment    
Market Risk [Line Items]    
2026 3.00% 2.90%
2027 2.40% 2.40%
2028 2.20% 2.00%
Germany | Upside scenario | HPI    
Market Risk [Line Items]    
2026 8.20% 5.40%
2027 9.80% 8.90%
2028 9.40% 9.90%
Germany | Baseline scenario    
Market Risk [Line Items]    
Un-weighted ECL € 623 € 540
Probability weighting 60.00% 60.00%
Germany | Baseline scenario | Real GDP    
Market Risk [Line Items]    
2026 1.10% 0.50%
2027 1.50% 1.10%
2028 1.30% 1.20%
Germany | Baseline scenario | Unemployment    
Market Risk [Line Items]    
2026 3.50% 3.40%
2027 3.20% 3.30%
2028 3.10% 3.20%
Germany | Baseline scenario | HPI    
Market Risk [Line Items]    
2026 5.00% 2.60%
2027 6.20% 5.60%
2028 6.30% 6.30%
Germany | Downside scenario    
Market Risk [Line Items]    
Un-weighted ECL € 713 € 609
Probability weighting 20.00% 20.00%
Germany | Downside scenario | Real GDP    
Market Risk [Line Items]    
2026 (1.70%) (1.70%)
2027 (1.10%) (1.70%)
2028 0.40% 0.30%
Germany | Downside scenario | Unemployment    
Market Risk [Line Items]    
2026 4.70% 4.70%
2027 5.30% 5.60%
2028 5.60% 5.90%
Germany | Downside scenario | HPI    
Market Risk [Line Items]    
2026 0.90% (1.70%)
2027 0.40% 1.30%
2028 2.70% 2.20%
Belgium    
Market Risk [Line Items]    
Reportable ECL € 596 € 579
Belgium | Upside scenario    
Market Risk [Line Items]    
Un-weighted ECL € 544 € 534
Probability weighting 20.00% 20.00%
Belgium | Upside scenario | Real GDP    
Market Risk [Line Items]    
2026 2.70% 2.20%
2027 2.30% 2.60%
2028 1.90% 2.10%
Belgium | Upside scenario | Unemployment    
Market Risk [Line Items]    
2026 5.10% 5.10%
2027 4.60% 5.00%
2028 4.50% 4.90%
Belgium | Upside scenario | HPI    
Market Risk [Line Items]    
2026 5.20% 4.80%
2027 4.90% 4.50%
2028 5.40% 4.40%
Belgium | Baseline scenario    
Market Risk [Line Items]    
Un-weighted ECL € 585 € 569
Probability weighting 60.00% 60.00%
Belgium | Baseline scenario | Real GDP    
Market Risk [Line Items]    
2026 1.10% 1.10%
2027 1.40% 1.50%
2028 1.60% 1.60%
Belgium | Baseline scenario | Unemployment    
Market Risk [Line Items]    
2026 5.90% 5.70%
2027 5.60% 5.70%
2028 5.50% 5.60%
Belgium | Baseline scenario | HPI    
Market Risk [Line Items]    
2026 3.70% 3.20%
2027 4.20% 4.10%
2028 4.40% 3.80%
Belgium | Downside scenario    
Market Risk [Line Items]    
Un-weighted ECL € 682 € 654
Probability weighting 20.00% 20.00%
Belgium | Downside scenario | Real GDP    
Market Risk [Line Items]    
2026 (1.50%) (0.60%)
2027 0.10% (0.20%)
2028 1.40% 1.10%
Belgium | Downside scenario | Unemployment    
Market Risk [Line Items]    
2026 7.00% 7.00%
2027 7.70% 8.00%
2028 7.90% 8.00%
Belgium | Downside scenario | HPI    
Market Risk [Line Items]    
2026 1.80% 1.20%
2027 2.60% 2.90%
2028 2.60% 2.50%
USA    
Market Risk [Line Items]    
Reportable ECL € 105 € 113
USA | Upside scenario    
Market Risk [Line Items]    
Un-weighted ECL € 64 € 74
Probability weighting 20.00% 20.00%
USA | Upside scenario | Real GDP    
Market Risk [Line Items]    
2026 3.20% 3.10%
2027 2.90% 3.50%
2028 2.70% 3.20%
USA | Upside scenario | Unemployment    
Market Risk [Line Items]    
2026 3.20% 3.40%
2027 2.50% 2.40%
2028 2.60% 2.30%
USA | Upside scenario | HPI    
Market Risk [Line Items]    
2026 4.80% 4.30%
2027 9.40% 8.40%
2028 10.90% 9.40%
USA | Baseline scenario    
Market Risk [Line Items]    
Un-weighted ECL € 92 € 101
Probability weighting 60.00% 60.00%
USA | Baseline scenario | Real GDP    
Market Risk [Line Items]    
2026 2.00% 2.00%
2027 2.00% 2.00%
2028 2.00% 2.00%
USA | Baseline scenario | Unemployment    
Market Risk [Line Items]    
2026 4.30% 4.20%
2027 4.10% 4.10%
2028 4.10% 4.00%
USA | Baseline scenario | HPI    
Market Risk [Line Items]    
2026 1.40% 3.30%
2027 2.70% 3.70%
2028 3.60% 3.90%
USA | Downside scenario    
Market Risk [Line Items]    
Un-weighted ECL € 184 € 187
Probability weighting 20.00% 20.00%
USA | Downside scenario | Real GDP    
Market Risk [Line Items]    
2026 (0.40%) (0.10%)
2027 (0.10%) (1.10%)
2028 0.80% (0.40%)
USA | Downside scenario | Unemployment    
Market Risk [Line Items]    
2026 6.70% 5.90%
2027 7.20% 7.30%
2028 7.50% 8.00%
USA | Downside scenario | HPI    
Market Risk [Line Items]    
2026 (5.10%) (0.70%)
2027 (7.90%) (3.00%)
2028 (5.50%) (2.50%)