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Taxes - Additional Information (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items] |  |  |
Income tax | kr (2,785) | kr (5,497) | kr (6,270)
Effective tax rate | (11.90%) | 22.30% | 21.40%
Expected applicable tax rate | 20.60% |  |
Actuarial gains and losses related to pensions | kr (251) | kr (2,093) |
Cash flow hedges | (380) | (671) |
Revaluation of borrowings | 137 | (212) |
Deferred tax assets | 22,375 | 19,394 |
Tax loss carry-forwards | 27,666 | 23,438 |
Unrecognized tax loss carry forwards | 8,918 | 8,490 |
Unrecognized tax loss carry forwards, tax value | 1,819 | 1,777 |
Income tax related to non-controlling interests | 0 | (4) |
Unrecognized deferred tax credits tax value | 1,148 | 1,296 |
Recognized deferred tax credits tax value | 5,453 | 2,081 |
Non-tax deductible goodwill impairment test | 31,900 |  |
DeferredTax | 1,406 | 1,617 |
Other comprehensive income (loss) totals | (494) | (2,980) |
Current tax | (4,289) | (7,353) | kr (6,110)
Department of justice [member] |  |  |
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items] |  |  |
Income tax |  | 450 |
Other comprehensive income [member] |  |  |
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items] |  |  |
DeferredTax | (631) | (2,099) |
Current tax | 137 | (881) |
Loss Carry Forwards [member] |  |  |
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items] |  |  |
Deferred tax assets | kr 6,158 | kr 5,190 |
Sweden [member] |  |  |
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items] |  |  |
Expected applicable tax rate | 20.60% | 20.60% | 20.60%
Impaired withholding tax assets |  | kr 411 | kr 969
Sweden [member] | Loss Carry Forwards [member] |  |  |
Disclosure of reconciliation of changes in deferred tax liability asset [Line Items] |  |  |
Deferred tax assets | kr 4,172 | kr 3,508 |

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- Definition The amount of income tax relating to amounts recognised in other comprehensive income in relation to hedges of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Other comprehensive income; Reserve of gains and losses on hedging instruments that hedge investments in equity instruments] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph ab -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_ab&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 90 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_90&doctype=Standard -URIDate 2023-03-23 + Details
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