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Taxes - Tax Effects of Temporary Differences and Tax Loss Carry-forwards (Detail) - SEK (kr) kr in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | kr 26,296 | kr 31,174 | kr 23,152
Deferred tax liabilities | 1,089 | 1,224 | 670
Net balance | 25,207 | 29,950 | kr 22,482
Intangible assets and property, plant and equipment [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 771 | 1,233 |
Deferred tax liabilities | 1,579 | 1,792 |
Current assets [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 2,235 | 3,413 |
Deferred tax liabilities | 862 | 878 |
Post employment benefits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 7,062 | 7,220 |
Deferred tax liabilities | 378 | 787 |
Provisions [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 3,739 | 3,592 |
Deferred tax credits [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 8,285 | 8,424 |
Other [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 1,794 | 2,585 |
Deferred tax liabilities | 277 | 281 |
Loss Carry Forwards [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 4,417 | 7,221 |
Deferred tax assets/ liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets | 28,303 | 33,688 |
Deferred tax liabilities | 3,096 | 3,738 |
Net balance | 25,207 | 29,950 |
Netting of tax assets/ liabilities [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Netting of deferred tax assets | (2,007) | (2,514) |
Netting of deferred tax liabilities | kr 2,007 | kr (2,514) |

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_o&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_56&doctype=Standard -URIDate 2020-01-01 + Details
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