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Post-Employment Benefits - Summary of Amount Recognized in the Consolidated Balance Sheet (Detail) - SEK (kr) kr in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit obligation (DBO) | kr 108,188 | kr 102,434 |
Fair value of plan assets | 73,611 | 69,659 |
Deficit/surplus (+/–) | 34,577 | 32,775 |
Plans with net surplus, excluding asset ceiling | 2,776 | 3,042 |
Post-employment beneﬁts | 37,353 | 35,817 | kr 28,720
Sweden [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit obligation (DBO) | 56,138 | 50,257 |
Fair value of plan assets | 26,967 | 22,809 |
Deficit/surplus (+/–) | 29,171 | 27,448 |
Post-employment beneﬁts | 29,171 | 27,448 |
US [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit obligation (DBO) | 17,921 | 20,897 |
Fair value of plan assets | 17,327 | 20,102 |
Deficit/surplus (+/–) | 594 | 795 |
Plans with net surplus, excluding asset ceiling | 92 |  |
Post-employment beneﬁts | 686 | 795 |
United Kingdom [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit obligation (DBO) | 15,788 | 15,352 |
Fair value of plan assets | 17,326 | 16,919 |
Deficit/surplus (+/–) | (1,538) | (1,567) |
Plans with net surplus, excluding asset ceiling | 2,090 | 2,137 |
Post-employment beneﬁts | 552 | 570 |
Other Countries [member] |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Defined benefit obligation (DBO) | 18,341 | 15,928 |
Fair value of plan assets | 11,991 | 9,829 |
Deficit/surplus (+/–) | 6,350 | 6,099 |
Plans with net surplus, excluding asset ceiling | 594 | 905 |
Post-employment beneﬁts | kr 6,944 | kr 7,004 |

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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 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + 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 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_57_a&doctype=Standard -URIDate 2020-01-01 + Details
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