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Post-Employment Benefits - Summary of Change in the Net Defined Benefit Obligation (Parenthetical) (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of net defined benefit liability (asset) [line items] |  |
Weighted average duration of DBO | 20 years 4 months 24 days | 20 years 9 months 18 days
Asset ceiling excluded from defined benefit cost recognized in income statement | kr 40 | kr 50
2022 [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Expected contribution to Alectas plan | kr 1,800 |

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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_147_b&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2021-03-24 + Details
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