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Taxes - Tax Effects of Temporary Differences and Tax Loss Carry-forwards (Detail) - SEK (kr) kr in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | kr 22,375 | kr 19,394 |
Deferred tax liabilities | 3,880 | 4,784 |
Net balance | 18,495 | 14,610 | kr 22,225
Intangible assets and property, plant and equipment [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 1,195 | 1,098 |
Deferred tax liabilities | 7,193 | 8,136 |
RoU lease assets and similar assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities | 1,272 | 1,311 |
Current assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 3,413 | 3,605 |
Deferred tax liabilities | 1,313 | 1,055 |
Post employment benefits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 5,297 | 5,558 |
Deferred tax liabilities | 477 | 571 |
Provisions [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 3,980 | 5,215 |
RoU lease liabilities and similar liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 1,337 | 1,394 |
Deferred tax credits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 5,453 | 2,081 |
Other [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 2,095 | 1,837 |
Deferred tax liabilities | 178 | 295 |
Loss Carry Forwards [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 6,158 | 5,190 |
Deferred tax assets/ liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 28,928 | 25,978 |
Deferred tax liabilities | 10,433 | 11,368 |
Net balance | 18,495 | 14,610 |
Netting of tax assets/ liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Netting of deferred tax assets | (6,553) | (6,584) |
Netting of deferred tax liabilities | kr (6,553) | kr (6,584) |

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