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Post-Employment Benefits - Summary of Present Value of the Defined Benefit Obligation (Detail) - SEK (kr) kr in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | kr 113,543 | kr 108,188
Of which partially or fully funded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 109,204 | 103,972
Of which unfunded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 4,339 | 4,216
Sweden [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 58,754 | 56,138
Sweden [member] | Of which partially or fully funded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 58,754 | 56,138
US [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 18,463 | 17,921
US [member] | Of which partially or fully funded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 17,805 | 17,235
US [member] | Of which unfunded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 658 | 686
United Kingdom [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 17,071 | 15,788
United Kingdom [member] | Of which partially or fully funded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 17,071 | 15,788
Other Countries [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 19,255 | 18,341
Other Countries [member] | Of which partially or fully funded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | 15,574 | 14,811
Other Countries [member] | Of which unfunded [member] |  |
Changes In Present Value Of Defined Benefit Obligations [Line Items] |  |
Defined benefit obligation (DBO) | kr 3,681 | kr 3,530

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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 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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