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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, 2021 SEK (kr) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 SEK (kr)
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | kr 31,831 |  |  | kr 30,160
Notes and bond loans [Member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | 22,685 |  |  | 21,837
Changes in fair value due to changes in credit risk 2021 | (64) |  |  |
Cumulative changes in fair value due to changes in credit risk 2021 | kr 346 |  |  |
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 9,163 |  |  | 8,537
Changes in fair value due to changes in credit risk 2021 | (86) |  |  |
Cumulative changes in fair value due to changes in credit risk 2021 | kr 58 |  |  |
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 |  |  |  | 5,034
Changes in fair value due to changes in credit risk 2021 | 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 5,297 |  |  | 5,290
Changes in fair value due to changes in credit risk 2021 | (27) |  |  |
Cumulative changes in fair value due to changes in credit risk 2021 | kr 118 |  |  |
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 1,393 |  |  | 1,278
Changes in fair value due to changes in credit risk 2021 | 31 |  |  |
Cumulative changes in fair value due to changes in credit risk 2021 | kr 81 |  |  |
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 1,825 |  |  | 1,698
Changes in fair value due to changes in credit risk 2021 | 47 |  |  |
Cumulative changes in fair value due to changes in credit risk 2021 | kr 115 |  |  |
Notes and bond loans [Member] | May 26, 2029 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | € |  |  | € 500 |
Coupon | 1.00% | 1.00% | 1.00% |
Currency | EUR |  |  |
Maturity date | May 26, 2029 |  |  |
Interest-bearing liabilities | kr 5,007 |  |  |
Changes in fair value due to changes in credit risk 2021 | (26) |  |  |
Cumulative changes in fair value due to changes in credit risk 2021 | (26) |  |  |
Bilateral loans [Member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | 8,733 |  |  | 5,383
Changes in fair value due to changes in credit risk 2021 | 33 |  |  |
Cumulative changes in fair value due to changes in credit risk 2021 | kr 84 |  |  |
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 2,033 |  |  | 1,826
Changes in fair value due to changes in credit risk 2021 | 17 |  |  |
Cumulative changes in fair value due to changes in credit risk 2021 | kr 44 |  |  |
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 2,608 |  |  | 2,320
Changes in fair value due to changes in credit risk 2021 | 47 |  |  |
Cumulative changes in fair value due to changes in credit risk 2021 | kr 62 |  |  |
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 1,400 |  |  | kr 1,237
Changes in fair value due to changes in credit risk 2021 | 35 |  |  |
Cumulative changes in fair value due to changes in credit risk 2021 | kr 44 |  |  |
Bilateral loans [Member] | Jun 21, 2028 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  | $ 305 |  |
Currency | USD |  |  |
Maturity date | Jun 21, 2028 |  |  |
Interest-bearing liabilities | kr 2,692 |  |  |
Changes in fair value due to changes in credit risk 2021 | (66) |  |  |
Cumulative changes in fair value due to changes in credit risk 2021 | kr (66) |  |  |

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