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Interest-Bearing Liabilities - Summary of Notes, Bonds, Bilateral Loans and Committed Credit (Parenthetical) (Detail) kr in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 SEK (kr) | Dec. 31, 2020 SEK (kr) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 SEK (kr)
Disclosure Of Borrowings [Line Items] |  |  |  |
Borrowings | kr | kr 30,160 | kr 30,160 |  | kr 37,696
Cash, cash equivalents, interest bearing securities and derivative assets | kr | kr 73,555 | kr 73,555 |  | kr 72,334
Maturity date |  | 2030 |  |
Swedish Export Credit Corporation (SEK) [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Borrowings |  |  | $ 170 |
New Bond Loan [member] | Swedish Export Credit Corporation (SEK) [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Borrowings |  |  | 200 |
Cash, cash equivalents, interest bearing securities and derivative assets |  |  | 30 |
Maturity date | 2030 |  |  |
Existing Loan Note [member] | Swedish Export Credit Corporation (SEK) [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Borrowings |  |  | $ 150 |
Maturity date | December 2025 |  |  |

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