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Financial Risk Management - Summary of Cash, Cash Equivalents and Interest-Bearing Securities (Detail) - SEK (kr)
kr in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Bank deposits kr 33,479 kr 38,658
Other financial institutions 548 604
Derivative assets 1,851 1,121
Cash, cash equivalents, interest bearing securities and derivative assets 56,556 57,370
Maturity within 3 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Bank deposits 33,298 38,485
Other financial institutions 548 604
Derivative assets 445 323
Cash, cash equivalents, interest bearing securities and derivative assets 38,585 41,610
Maturity between 3 and 12 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Bank deposits 181 166
Other financial institutions 0 0
Derivative assets 749 385
Cash, cash equivalents, interest bearing securities and derivative assets 7,384 6,183
Maturity less than five years [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Bank deposits 0 7
Other financial institutions 0 0
Derivative assets 622 277
Cash, cash equivalents, interest bearing securities and derivative assets 10,552 9,441
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
Derivative assets 35 136
Cash, cash equivalents, interest bearing securities and derivative assets 35 136
AA/AAA [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Type of issuer/counterpart Governments 2,533 5,142
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 789 915
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 490 3,950
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 1,254 277
AA/AAA [member] | 2026 and later [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Type of issuer/counterpart Governments 0 0
A2/P2 [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Corporates 1,806 1,283
A2/P2 [member] | Maturity within 3 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Corporates 1,510 1,283
A2/P2 [member] | Maturity between 3 and 12 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Corporates 296 0
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 16,339 10,562
AAA [member] | Maturity within 3 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Mortgage institutes 1,995 0
AAA [member] | Maturity between 3 and 12 months [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Mortgage institutes 5,668 1,682
AAA [member] | Maturity less than five years [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Mortgage institutes 8,676 8,880
AAA [member] | 2026 and later [member]    
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items]    
Mortgage institutes kr 0 kr 0