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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
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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

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