v3.25.4
Capital adequacy - Credit risk by PD grade (Details) - SEK (kr)
kr in Millions
Dec. 31, 2025
Dec. 31, 2024
AAA to AA- | Central governments    
Disclosure of credit risk exposure [line items]    
EAD kr 229,172 kr 209,730
AAA to AA- | Financial institutions    
Disclosure of credit risk exposure [line items]    
EAD 17,093 14,245
AAA to AA- | Corporates    
Disclosure of credit risk exposure [line items]    
EAD 6,143 4,423
A+ to A- | Central governments    
Disclosure of credit risk exposure [line items]    
EAD 4,125 2,091
A+ to A- | Financial institutions    
Disclosure of credit risk exposure [line items]    
EAD 11,298 18,777
A+ to A- | Corporates    
Disclosure of credit risk exposure [line items]    
EAD 24,362 27,693
BBB+ to BBB- | Financial institutions    
Disclosure of credit risk exposure [line items]    
EAD 873 995
BBB+ to BBB- | Corporates    
Disclosure of credit risk exposure [line items]    
EAD 78,997 75,379
BB+ to B- | Central governments    
Disclosure of credit risk exposure [line items]    
EAD 7 12
BB+ to B- | Financial institutions    
Disclosure of credit risk exposure [line items]    
EAD 22 50
BB+ to B- | Corporates    
Disclosure of credit risk exposure [line items]    
EAD 30,530 32,193
CCC to D | Corporates    
Disclosure of credit risk exposure [line items]    
EAD kr 1,345 kr 809
Weighted average | AAA to AA- | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 0.003% 0.003%
Average LGD in % 45.00% 45.00%
Average risk weight in % 3.80% 4.10%
Weighted average | AAA to AA- | Financial institutions    
Disclosure of credit risk exposure [line items]    
PD in % 0.03% 0.03%
Average LGD in % 27.60% 34.80%
Average risk weight in % 16.40% 15.00%
Weighted average | AAA to AA- | Corporates    
Disclosure of credit risk exposure [line items]    
PD in % 0.03% 0.03%
Average LGD in % 40.00% 45.00%
Average risk weight in % 17.50% 11.80%
Weighted average | A+ to A- | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 0.04% 0.06%
Average LGD in % 45.00% 45.00%
Average risk weight in % 16.40% 22.80%
Weighted average | A+ to A- | Financial institutions    
Disclosure of credit risk exposure [line items]    
PD in % 0.05% 0.05%
Average LGD in % 36.30% 29.40%
Average risk weight in % 22.30% 16.80%
Weighted average | A+ to A- | Corporates    
Disclosure of credit risk exposure [line items]    
PD in % 0.06% 0.06%
Average LGD in % 40.00% 45.00%
Average risk weight in % 18.70% 19.80%
Weighted average | BBB+ to BBB- | Financial institutions    
Disclosure of credit risk exposure [line items]    
PD in % 0.35% 0.33%
Average LGD in % 45.00% 45.00%
Average risk weight in % 77.40% 80.00%
Weighted average | BBB+ to BBB- | Corporates    
Disclosure of credit risk exposure [line items]    
PD in % 0.21% 0.21%
Average LGD in % 40.00% 45.00%
Average risk weight in % 38.80% 46.10%
Weighted average | BB+ to B- | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 0.70% 1.20%
Average LGD in % 45.00% 45.00%
Average risk weight in % 82.50% 105.20%
Weighted average | BB+ to B- | Financial institutions    
Disclosure of credit risk exposure [line items]    
PD in % 0.79% 1.18%
Average LGD in % 45.00% 45.00%
Average risk weight in % 109.00% 130.00%
Weighted average | BB+ to B- | Corporates    
Disclosure of credit risk exposure [line items]    
PD in % 0.86% 0.81%
Average LGD in % 40.00% 45.00%
Average risk weight in % 74.00% 86.90%
Weighted average | CCC to D | Central governments    
Disclosure of credit risk exposure [line items]    
PD in %   100.00%
Average LGD in %   45.00%
Weighted average | CCC to D | Corporates    
Disclosure of credit risk exposure [line items]    
PD in % 61.10% 45.50%
Average LGD in % 40.00% 45.00%
Average risk weight in % 131.30% 219.40%
Top of range | AAA to AA- | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 0.01% 0.01%
Top of range | AAA to AA- | Financial institutions and corporates    
Disclosure of credit risk exposure [line items]    
PD in % 0.032% 0.04%
Top of range | A+ to A- | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 0.06% 0.06%
Top of range | A+ to A- | Financial institutions and corporates    
Disclosure of credit risk exposure [line items]    
PD in % 0.06% 0.11%
Top of range | BBB+ to BBB- | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 0.27% 0.27%
Top of range | BBB+ to BBB- | Financial institutions and corporates    
Disclosure of credit risk exposure [line items]    
PD in % 0.35% 0.32%
Top of range | BB+ to B- | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 7.69% 7.69%
Top of range | BB+ to B- | Financial institutions and corporates    
Disclosure of credit risk exposure [line items]    
PD in % 11.43% 8.27%
Top of range | CCC to D | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 100.00% 100.00%
Top of range | CCC to D | Financial institutions and corporates    
Disclosure of credit risk exposure [line items]    
PD in % 100.00% 100.00%
Bottom of range | AAA to AA- | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 0.003% 0.003%
Bottom of range | AAA to AA- | Financial institutions and corporates    
Disclosure of credit risk exposure [line items]    
PD in % 0.003% 0.01%
Bottom of range | A+ to A- | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 0.02% 0.02%
Bottom of range | A+ to A- | Financial institutions and corporates    
Disclosure of credit risk exposure [line items]    
PD in % 0.05% 0.06%
Bottom of range | BBB+ to BBB- | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 0.10% 0.10%
Bottom of range | BBB+ to BBB- | Financial institutions and corporates    
Disclosure of credit risk exposure [line items]    
PD in % 0.15% 0.16%
Bottom of range | BB+ to B- | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 0.45% 0.45%
Bottom of range | BB+ to B- | Financial institutions and corporates    
Disclosure of credit risk exposure [line items]    
PD in % 0.50% 0.50%
Bottom of range | CCC to D | Central governments    
Disclosure of credit risk exposure [line items]    
PD in % 38.28% 38.28%
Bottom of range | CCC to D | Financial institutions and corporates    
Disclosure of credit risk exposure [line items]    
PD in % 35.29% 28.91%