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Financial Risk Management - Summary of Cash, Cash Equivalents and Interest-Bearing Securities (Detail) - SEK (kr) kr in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | kr 44,873 | kr 26,975
Other financial institutions | 247 | 202
Derivative assets | 317 | 1,510
Cash, cash equivalents, interest bearing securities and derivative assets | 97,925 | 73,555
Maturity within 3 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | 44,758 | 26,829
Other financial institutions | 247 | 202
Derivative assets | 118 | 189
Cash, cash equivalents, interest bearing securities and derivative assets | 55,092 | 44,396
Maturity between 3 and 12 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | 104 | 130
Other financial institutions | 0 | 0
Derivative assets | 199 | 346
Cash, cash equivalents, interest bearing securities and derivative assets | 8,958 | 5,050
Maturity less than five years [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Bank deposits | 11 | 16
Other financial institutions | 0 | 0
Derivative assets | 0 | 975
Cash, cash equivalents, interest bearing securities and derivative assets | 33,571 | 23,714
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 | 0 | 0
Cash, cash equivalents, interest bearing securities and derivative assets | 304 | 395
AAA [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 20,509 | 28,483
Mortgage institutes | 27,753 | 14,425
AAA [member] | Maturity within 3 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 5,743 | 15,000
Mortgage institutes | 0 | 216
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 | 2,906 | 605
Mortgage institutes | 5,749 | 3,969
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 | 11,860 | 12,483
Mortgage institutes | 21,700 | 10,240
AAA [member] | 2026 and later [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Type of issuer/counterpart Governments | 0 | 395
Mortgage institutes | 304 | 0
A2/P2 [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | 4,226 | 1,960
A2/P2 [member] | Maturity within 3 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | 4,226 | 1,960
A2/P2 [member] | Maturity between 3 and 12 months [member] |  |
Disclosure Of Cash And Cash Equivalents And Interest Bearing Securities [Line Items] |  |
Corporates | 0 | 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 | kr 0 | kr 0

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