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Post-Employment Benefits - Summary of Sensitivity Analysis of Significant Actuarial Assumptions (Detail) - Present value of defined benefit obligation [member] kr in Millions | Dec. 31, 2020 SEK (kr)
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Discount rate | Sweden [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate -0.5% | kr 7.2
Discount rate +0.5% | (6.3)
Discount rate | US [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate -0.5% | 1.1
Discount rate +0.5% | (1.0)
Discount rate | United Kingdom [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate -0.5% | 2.0
Discount rate +0.5% | (1.7)
Actuarial assumption of expected rates of inflation [member] | Sweden [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate -0.5% | (6.3)
Discount rate +0.5% | 7.2
Actuarial assumption of expected rates of inflation [member] | US [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate -0.5% | 0.0
Discount rate +0.5% | 0.0
Actuarial assumption of expected rates of inflation [member] | United Kingdom [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate -0.5% | (1.4)
Discount rate +0.5% | 1.5
Actuarial assumption of expected rates of salary increases [member] | Sweden [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate -0.5% | (2.6)
Discount rate +0.5% | 2.7
Actuarial assumption of expected rates of salary increases [member] | US [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate -0.5% | 0.0
Discount rate +0.5% | 0.0
Longevity | Sweden [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate -0.5% | (2.9)
Discount rate +0.5% | 2.9
Longevity | US [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate -0.5% | (0.5)
Discount rate +0.5% | 0.5
Longevity | United Kingdom [member] |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Discount rate -0.5% | (0.6)
Discount rate +0.5% | kr 0.6

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
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