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Taxes - Reconciliation of Swedish Income Tax Rate with Effective Tax Rate (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |
Calculated tax expense at Swedish tax rate 20.6% | kr (6,025) | kr (5,823) | kr (1,875)
Effect of foreign tax rates | (324) | (616) | (419)
Current income taxes related to prior years | (337) | (175) | (2,237)
Remeasurement of tax loss carry-forwards | (175) | (258) | 52
Remeasurement of deductible temporary differences | 220 | 369 | 84
Withholding tax expense | 0 | (1,393) | (230)
Reversal of impaired withholding tax | 969 | 0 | 519
Tax effect of non-deductible expenses | (975) | (2,079) | (3,555)
Tax effect of non-taxable income | 392 | 372 | 803
Tax effect of changes in tax rates | (15) | 14 | (64)
Income tax expense | kr (6,270) | kr (9,589) | kr (6,922)
Effective tax rate | 21.40% | 35.20% | 79.00%

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- Definition Adjustments of tax expense (income) recognised in the period for current tax of prior periods. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 80 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_80_b&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to foreign tax rates. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2021-03-24 + Details
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