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Post-Employment Benefits - Summary of Amount Recognized in the Consolidated Balance Sheet (Detail) - SEK (kr) kr in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation (DBO) | kr 113,543 | kr 108,188
Fair value of plan assets | 81,355 | 73,611
Deficit/surplus (+/–) | 32,188 | 34,577
Plans with net surplus, excluding asset ceiling | 3,862 | 2,776
Post-employment beneﬁts | 36,050 | 37,353
Sweden [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation (DBO) | 58,754 | 56,138
Fair value of plan assets | 29,876 | 26,967
Deficit/surplus (+/–) | 28,878 | 29,171
Post-employment beneﬁts | 28,878 | 29,171
US [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation (DBO) | 18,463 | 17,921
Fair value of plan assets | 18,254 | 17,327
Deficit/surplus (+/–) | 209 | 594
Plans with net surplus, excluding asset ceiling | 450 | 92
Post-employment beneﬁts | 659 | 686
United Kingdom [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation (DBO) | 17,071 | 15,788
Fair value of plan assets | 19,427 | 17,326
Deficit/surplus (+/–) | (2,356) | (1,538)
Plans with net surplus, excluding asset ceiling | 2,802 | 2,090
Post-employment beneﬁts | 446 | 552
Other Countries [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit obligation (DBO) | 19,255 | 18,341
Fair value of plan assets | 13,798 | 11,991
Deficit/surplus (+/–) | 5,457 | 6,350
Plans with net surplus, excluding asset ceiling | 610 | 594
Post-employment beneﬁts | kr 6,067 | kr 6,944

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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 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 57 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard -URIDate 2021-03-24 + Details
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