Capital adequacy - Leverage ratio (Details) - SEK (kr) kr in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Capital adequacy [Abstract] | ||
| On-balance exposures | kr 236,953 | kr 234,139 |
| Off-balance exposures | 7,161 | 8,775 |
| Total exposure measure | kr 244,114 | kr 242,914 |
| Leverage ratio | 9.50% | 9.60% |
| Total Leverage ratio requirement | ||
| Capital base requirement of 3 percent | kr 7,323 | kr 7,288 |
| Pillar 2 guidance | 366 | 365 |
| Total capital requirement relating to Leverage ratio including Pillar 2 guidance | kr 7,689 | kr 7,653 |
| Capital base requirement of 3 percent (in percent) | 3.00% | 3.00% |
| Pillar 2 guidance (in percent) | 0.20% | 0.20% |
| Total capital requirement relating to leverage ratio (in percent) | 3.20% | 3.20% |
| Additional capital (pillar 2 guidance) of total leverage ratio exposure | 0.15% |