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Financial Risk Management - Summary of Cash, Cash Equivalents and Interest-Bearing Securities (Detail) - SEK (kr)
kr in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Bank deposits kr 41,138 kr 33,479
Other financial institutions 1,437 548
Cash, cash equivalents, interest bearing securities and derivative assets 75,871 54,705
Maturity within 3 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Bank deposits 40,749 33,298
Other financial institutions 1,437 548
Cash, cash equivalents, interest bearing securities and derivative assets 49,497 38,140
Maturity between 3 and 12 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Bank deposits 389 181
Other financial institutions 0 0
Cash, cash equivalents, interest bearing securities and derivative assets 6,935 6,635
Maturity less than five years [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Bank deposits 0 0
Other financial institutions 0 0
Cash, cash equivalents, interest bearing securities and derivative assets 18,053 9,930
2026 and later [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Bank deposits 0 0
Other financial institutions 0 0
Cash, cash equivalents, interest bearing securities and derivative assets 1,386 0
AA/AAA [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Type of issuer/counterpart Governments 9,412 2,533
AA/AAA [member] | Maturity within 3 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Type of issuer/counterpart Governments 4,639 789
AA/AAA [member] | Maturity between 3 and 12 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Type of issuer/counterpart Governments 995 490
AA/AAA [member] | Maturity less than five years [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Type of issuer/counterpart Governments 3,175 1,254
AA/AAA [member] | 2026 and later [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Type of issuer/counterpart Governments 603 0
A2/P2 [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Corporates 2,870 1,806
A2/P2 [member] | Maturity within 3 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Corporates 2,672 1,510
A2/P2 [member] | Maturity between 3 and 12 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Corporates 198 296
A2/P2 [member] | Maturity less than five years [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Corporates 0 0
A2/P2 [member] | 2026 and later [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Corporates 0 0
AAA [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Mortgage institutes 21,014 16,339
AAA [member] | Maturity within 3 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Mortgage institutes 0 1,995
AAA [member] | Maturity between 3 and 12 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Mortgage institutes 5,353 5,668
AAA [member] | Maturity less than five years [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Mortgage institutes 14,878 8,676
AAA [member] | 2026 and later [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Mortgage institutes kr 783 kr 0