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Taxes - Deferred Tax Credits (Detail) - SEK (kr) kr in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | kr 5,453 | kr 2,081
Unrecognized deferred tax credits tax value | 1,148 | kr 1,296
2024 [member] |  |
Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | 99 |
Unrecognized deferred tax credits tax value | 135 |
2025 [member] |  |
Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | 938 |
Unrecognized deferred tax credits tax value | 108 |
2026 [member] |  |
Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | 46 |
Unrecognized deferred tax credits tax value | 125 |
2027 [member] |  |
Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | 1,778 |
Unrecognized deferred tax credits tax value | 133 |
2028 [member] |  |
Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | 1,521 |
Unrecognized deferred tax credits tax value | 8 |
2029 or later [member] |  |
Disclosure of Deferred Tax Credits [Line Items] |  |
Recognized deferred tax credits tax value | 1,071 |
Unrecognized deferred tax credits tax value | kr 639 |

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