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Interest-Bearing Liabilities - Summary of Notes, Bonds, Bilateral Loans and Committed Credit (Detail) € in Millions, kr in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 SEK (kr) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 SEK (kr)
Disclosure Of Borrowings [Line Items] |  |  |  |
Maturity date | 2030 |  |  |
Interest-bearing liabilities | kr 30,160 |  |  | kr 37,696
Notes and bond loans [Member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | 21,837 |  |  | 23,499
Changes in fair value due to changes in credit risk 2020 | (192) |  |  |
Cumulative changes in fair value due to changes in credit risk 2020 | kr 410 |  |  |
Notes and bond loans [Member] | Dec 30, 2030 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  | $ 200 |  |
Coupon | 3.02% | 3.02% | 3.02% |
Currency | USD |  |  |
Maturity date | Dec 30, 2030 |  |  |
Interest-bearing liabilities | kr 1,698 |  |  |
Changes in fair value due to changes in credit risk 2020 | 68 |  |  |
Cumulative changes in fair value due to changes in credit risk 2020 | kr 68 |  |  |
Notes and bond loans [Member] | Dec 23, 2020 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  | $ 170 |  |
Currency | USD |  |  |
Maturity date | Dec 23, 2020 |  |  |
Interest-bearing liabilities |  |  |  | 1,601
Changes in fair value due to changes in credit risk 2020 | kr (16) |  |  |
Notes and bond loans [Member] | May 15, 2022 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  | $ 1,000 |  |
Coupon | 4.125% | 4.125% | 4.125% |
Currency | USD |  |  |
Maturity date | May 15, 2022 |  |  |
Interest-bearing liabilities | kr 8,537 |  |  | 9,695
Changes in fair value due to changes in credit risk 2020 | (165) |  |  |
Cumulative changes in fair value due to changes in credit risk 2020 | kr 144 |  |  |
Notes and bond loans [Member] | Mar 1, 2021 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | € |  |  | € 500 |
Coupon | 0.875% | 0.875% | 0.875% |
Currency | EUR |  |  |
Maturity date | Mar 1, 2021 |  |  |
Interest-bearing liabilities | kr 5,034 |  |  | 5,267
Changes in fair value due to changes in credit risk 2020 | (38) |  |  |
Cumulative changes in fair value due to changes in credit risk 2020 | kr 3 |  |  |
Notes and bond loans [Member] | Mar 1, 2024 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | € |  |  | € 500 |
Coupon | 1.875% | 1.875% | 1.875% |
Currency | EUR |  |  |
Maturity date | Mar 1, 2024 |  |  |
Interest-bearing liabilities | kr 5,290 |  |  | 5,512
Changes in fair value due to changes in credit risk 2020 | (63) |  |  |
Cumulative changes in fair value due to changes in credit risk 2020 | kr 145 |  |  |
Notes and bond loans [Member] | Dec 22, 2025 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  | $ 150 |  |
Coupon | 2.741% | 2.741% | 2.741% |
Currency | USD |  |  |
Maturity date | Dec 22, 2025 |  |  |
Interest-bearing liabilities | kr 1,278 |  |  | 1,424
Changes in fair value due to changes in credit risk 2020 | 22 |  |  |
Cumulative changes in fair value due to changes in credit risk 2020 | 50 |  |  |
Bilateral loans [Member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | 5,383 |  |  | 12,400
Changes in fair value due to changes in credit risk 2020 | 93 |  |  |
Cumulative changes in fair value due to changes in credit risk 2020 | kr 51 |  |  |
Bilateral loans [Member] | Dec 18, 2025 [Member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  | $ 150 |  |
Currency | USD |  |  |
Maturity date | Dec 18, 2025 |  |  |
Interest-bearing liabilities | kr 1,237 |  |  | 1,371
Changes in fair value due to changes in credit risk 2020 | 35 |  |  |
Cumulative changes in fair value due to changes in credit risk 2020 | kr 9 |  |  |
Bilateral loans [Member] | November 6, 2020 [Member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  | 684 |  |
Currency | USD |  |  |
Maturity date | Nov 6, 2020 |  |  |
Interest-bearing liabilities |  |  |  | 6,345
Changes in fair value due to changes in credit risk 2020 | kr 32 |  |  |
Bilateral loans [Member] | June 15, 2023 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  | 220 |  |
Currency | USD |  |  |
Maturity date | Jun 15, 2023 |  |  |
Interest-bearing liabilities | kr 1,826 |  |  | 2,078
Changes in fair value due to changes in credit risk 2020 | (5) |  |  |
Cumulative changes in fair value due to changes in credit risk 2020 | kr 27 |  |  |
Bilateral loans [Member] | July 31, 2024 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  | $ 281 |  |
Currency | USD |  |  |
Maturity date | July 31, 2024 |  |  |
Interest-bearing liabilities | kr 2,320 |  |  | kr 2,606
Changes in fair value due to changes in credit risk 2020 | 31 |  |  |
Cumulative changes in fair value due to changes in credit risk 2020 | kr 15 |  |  |

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