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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items] |  |  |
Pension cost for defined contribution plans | kr 2,178 | kr 2,734 | kr 2,725
Pension cost for defined benefit plans | 2,785 | 2,436 | 2,157
Total | kr 4,963 | kr 5,170 | kr 4,882
Total pension cost expressed as a percentage of wages and salaries | 8.10% | 8.80% | 9.20%
Sweden [member] |  |  |
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items] |  |  |
Pension cost for defined contribution plans | kr 963 | kr 953 | kr 937
Pension cost for defined benefit plans | 1,783 | 1,704 | 1,350
Total | 2,746 | 2,657 | 2,287
US [member] |  |  |
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items] |  |  |
Pension cost for defined contribution plans | 415 | 456 | 473
Pension cost for defined benefit plans | 13 | (110) | 175
Total | 428 | 346 | 648
United Kingdom [member] |  |  |
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items] |  |  |
Pension cost for defined contribution plans | 136 | 132 | 145
Pension cost for defined benefit plans | (4) | (47) | 75
Total | 132 | 85 | 220
Other Countries [member] |  |  |
Disclosure of Defined Benefit Plans Expense Recognized In Income Statement [line items] |  |  |
Pension cost for defined contribution plans | 664 | 1,193 | 1,170
Pension cost for defined benefit plans | 993 | 889 | 557
Total | kr 1,657 | kr 2,082 | kr 1,727

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- Definition Defined benefit expense benefit as percentage of wages and salaries. + References No definition available. + Details
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- Definition Defined contribution and defined benefit plan expense. + References No definition available. + Details
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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 2020-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_53&doctype=Standard -URIDate 2020-01-01 + Details
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