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Post-Employment Benefits - Summary of Present Value of the Defined Benefit Obligation (Detail) - SEK (kr) kr in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | kr 108,188 | kr 102,434
Of which partially or fully funded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 103,972 | 97,958
Of which unfunded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 4,216 | 4,476
Sweden [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 56,138 | 50,257
Sweden [member] | Of which partially or fully funded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 56,138 | 50,257
US [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 17,921 | 20,897
US [member] | Of which partially or fully funded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 17,235 | 20,138
US [member] | Of which unfunded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 686 | 759
United Kingdom [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 15,788 | 15,352
United Kingdom [member] | Of which partially or fully funded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 15,788 | 15,352
Other Countries [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 18,341 | 15,928
Other Countries [member] | Of which partially or fully funded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 14,811 | 12,211
Other Countries [member] | Of which unfunded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | kr 3,530 | kr 3,717

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- Definition Changes in present value of defined benefit obligations. + References No definition available. + Details
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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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