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Post-Employment Benefits - Summary of Pension Costs for Defined Contribution Plans and Defined Benefit Plans (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items] |  |  |
Pension cost for defined contribution plans | kr 2,881 | kr 2,178 | kr 2,734
Pension cost for defined benefit plans | 2,942 | 2,785 | 2,436
Total | kr 5,823 | kr 4,963 | kr 5,170
Total pension cost expressed as a percentage of wages and salaries | 9.30% | 8.10% | 8.80%
Sweden [member] |  |  |
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items] |  |  |
Pension cost for defined contribution plans | kr 1,199 | kr 963 | kr 953
Pension cost for defined benefit plans | 1,920 | 1,783 | 1,704
Total | 3,119 | 2,746 | 2,657
US [member] |  |  |
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items] |  |  |
Pension cost for defined contribution plans | 460 | 415 | 456
Pension cost for defined benefit plans | 97 | 13 | (110)
Total | 557 | 428 | 346
United Kingdom [member] |  |  |
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items] |  |  |
Pension cost for defined contribution plans | 138 | 136 | 132
Pension cost for defined benefit plans | (6) | (4) | (47)
Total | 132 | 132 | 85
Other Countries [member] |  |  |
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items] |  |  |
Pension cost for defined contribution plans | 1,084 | 664 | 1,193
Pension cost for defined benefit plans | 931 | 993 | 889
Total | kr 2,015 | kr 1,657 | kr 2,082

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- Definition Disclosure Of Defined Benefit Plans Expense Recognized In Income Statement [line items] + References No definition available. + Details
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- Definition Post-employment benefit expense including settlement (gain) loss and net interest (income) loss defined benefit plans. + References No definition available. + Details
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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_53&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of post-employment benefit expense included in profit or loss + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_5&doctype=Standard -URIDate 2021-03-24 + Details
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