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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, 2023 SEK (kr) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 SEK (kr)
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | kr 46,873 |  |  | kr 32,930
Notes and bond loans [Member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | 26,888 |  |  | 19,811
Changes in fair value due to changes in credit risk 2023 | 539 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr 114 |  |  |
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 5,523 |  |  | 5,392
Changes in fair value due to changes in credit risk 2023 | (33) |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr 13 |  |  |
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 1,416 |  |  | 1,422
Changes in fair value due to changes in credit risk 2023 | (3) |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr 27 |  |  |
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 1,736 |  |  | 1,682
Changes in fair value due to changes in credit risk 2023 | 69 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr 87 |  |  |
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 4,701 |  |  | 4,196
Changes in fair value due to changes in credit risk 2023 | 160 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr (152) |  |  |
Notes and bond loans [Member] | Feb 8, 2027 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | € |  | € 750 |  |
Coupon | 1.125% | 1.125% | 1.125% |
Currency | EUR |  |  |
Maturity date | Feb 8, 2027 |  |  |
Interest-bearing liabilities | kr 7,714 |  |  | 7,119
Changes in fair value due to changes in credit risk 2023 | 205 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr (2) |  |  |
Notes and bond loans [Member] | May 29, 2028 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | € |  | € 500 |  |
Coupon | 5.375% | 5.375% | 5.375% |
Currency | EUR |  |  |
Maturity date | May 29, 2028 |  |  |
Interest-bearing liabilities | kr 5,798 |  |  | 0
Changes in fair value due to changes in credit risk 2023 | 141 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | 141 |  |  |
Bilateral Loans And Syndicated Loans [Member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | 15,133 |  |  | 9,753
Changes in fair value due to changes in credit risk 2023 | 128 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr (46) |  |  |
Bilateral Loans And Syndicated 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 0 |  |  | 2,292
Changes in fair value due to changes in credit risk 2023 | (6) |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr 0 |  |  |
Bilateral Loans And Syndicated 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 2,829 |  |  | 2,925
Changes in fair value due to changes in credit risk 2023 | 7 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr 11 |  |  |
Bilateral Loans And Syndicated 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 1,509 |  |  | 1,555
Changes in fair value due to changes in credit risk 2023 | 9 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr 8 |  |  |
Bilateral Loans And Syndicated 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 2,976 |  |  | 2,981
Changes in fair value due to changes in credit risk 2023 | 107 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr (76) |  |  |
Bilateral Loans And Syndicated Loans [Member] | Dec 16, 2030 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | 107 |
Currency | USD |  |  |
Maturity date | Dec 16, 2030 |  |  |
Interest-bearing liabilities | kr 1,097 |  |  | 0
Changes in fair value due to changes in credit risk 2023 | 29 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr 29 |  |  |
Bilateral Loans And Syndicated Loans [Member] | Dec 18, 2030 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | 273 |
Currency | USD |  |  |
Maturity date | Dec 18, 2030 |  |  |
Interest-bearing liabilities | kr 2,718 |  |  | 0
Changes in fair value due to changes in credit risk 2023 | (18) |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr (18) |  |  |
Bilateral Loans And Syndicated Loans [Member] | Aug 30, 2024 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | 200 |
Currency | USD |  |  |
Maturity date | Aug 30, 2024 |  |  |
Interest-bearing liabilities | kr 2,002 |  |  | 0
Changes in fair value due to changes in credit risk 2023 | 0 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr 0 |  |  |
Bilateral Loans And Syndicated Loans [Member] | Feb 29, 2024 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | $ 200 |
Currency | USD |  |  |
Maturity date | Feb 29, 2024 |  |  |
Interest-bearing liabilities | kr 2,002 |  |  | 0
Changes in fair value due to changes in credit risk 2023 | 0 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | 0 |  |  |
Commercial papers [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | 2,014 |  |  | 0
Changes in fair value due to changes in credit risk 2023 | 0 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | 0 |  |  |
Commercial papers [member] | Feb - Mar 2024 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | kr 2,030 |  |  |
Currency | SEK |  |  |
Maturity date | Feb-Mar 2024 |  |  |
Interest-bearing liabilities | kr 2,014 |  |  | kr 0
Changes in fair value due to changes in credit risk 2023 | 0 |  |  |
Cumulative changes in fair value due to changes in credit risk 2023 | kr 0 |  |  |

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