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Post-Employment Benefits - Summary of Amount Recognized in the Consolidated Balance Sheet (Detail) - SEK (kr) kr in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation (DBO) | kr 85,535 | kr 83,691
Fair value of plan assets | 62,593 | 60,480
Deficit/surplus (+/–) | 22,942 | 23,211
Plans with net surplus, excluding asset ceiling | 3,287 | 4,150
Provision for post-employment benefits | 26,229 | 27,361
Sweden [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation (DBO) | 50,043 | 50,441
Fair value of plan assets | 29,627 | 28,521
Deficit/surplus (+/–) | 20,416 | 21,920
Plans with net surplus, excluding asset ceiling | 0 | 0
Provision for post-employment benefits | 20,416 | 21,920
US [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation (DBO) | 5,073 | 5,365
Fair value of plan assets | 4,815 | 5,111
Deficit/surplus (+/–) | 258 | 254
Plans with net surplus, excluding asset ceiling | 255 | 298
Provision for post-employment benefits | 513 | 552
United Kingdom [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation (DBO) | 10,595 | 9,866
Fair value of plan assets | 12,410 | 11,999
Deficit/surplus (+/–) | (1,815) | (2,133)
Plans with net surplus, excluding asset ceiling | 1,889 | 2,137
Provision for post-employment benefits | 74 | 4
Other Countries [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation (DBO) | 19,824 | 18,019
Fair value of plan assets | 15,741 | 14,849
Deficit/surplus (+/–) | 4,083 | 3,170
Plans with net surplus, excluding asset ceiling | 1,143 | 1,715
Provision for post-employment benefits | kr 5,226 | kr 4,885

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- Definition The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of non-current net defined benefit liability. [Refer: Net defined benefit liability] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 57 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_57_a&doctype=Standard -URIDate 2023-03-23 + Details
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