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Interest-Bearing Liabilities - Additional Information (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Interest Bearing Liabilities [Line Items] |  |  |
Interest-bearing liabilities | kr 30,160 | kr 37,696 |
Revaluation of borrowings due to change in credit risk | kr 99 | kr (651) | kr 207
European Investment Bank credit facility [member] |  |  |
Disclosure Of Interest Bearing Liabilities [Line Items] |  |  |
Weighted average interest rate of long term debt | 2.18% | 3.26% |

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