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Post-Employment Benefits - Summary of Change in the Net Defined Benefit Obligation (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items] |  |
Opening balance | kr 32,775 | kr 25,998
Adjustment | (122) |
Opening balance adjusted | 32,653 | 25,998
Included in the income statement |  |
Current service cost | 2,424 | 1,977
Past service cost and gains and losses on settlements | (76) | (266)
Interest cost/income (+/–) | 305 | 639
Taxes and administrative expenses | 29 | 49
Other | 53 | 1
Components of defined benefit cost recognized | 2,735 | 2,400
Remeasurements |  |
Return on plan assets excluding amounts in interest expense/income | (4,734) | (5,758)
Actuarial gains/losses (–/+) arising from changes in demographic assumptions | 10 | (775)
Actuarial gains/losses (–/+) arising from changes in financial assumptions | 9,247 | 12,443
Experience-based gains/losses (–/+) | 320 | (126)
Total remeasurements | 4,843 | 5,784
Translation difference | (124) | 3
Contributions and payments from: |  |
Employers | (5,533) | (1,504)
Plan participants |  | 2
Settlements | (12) | (35)
Business combinations and divestments | 15 | 127
Closing balance | 34,577 | 32,775
Present value of defined benefit obligation [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Opening balance | 102,434 | 90,320
Adjustment | 2,654 |
Opening balance adjusted | 105,088 | 90,320
Included in the income statement |  |
Current service cost | 2,424 | 1,977
Past service cost and gains and losses on settlements | (76) | (266)
Interest cost/income (+/–) | 1,759 | 2,577
Other | 51 | (1)
Components of defined benefit cost recognized | 4,158 | 4,287
Remeasurements |  |
Actuarial gains/losses (–/+) arising from changes in demographic assumptions | 10 | (775)
Actuarial gains/losses (–/+) arising from changes in financial assumptions | 9,247 | 12,443
Experience-based gains/losses (–/+) | 320 | (126)
Total remeasurements | 9,577 | 11,542
Translation difference | (5,373) | 2,079
Contributions and payments from: |  |
Employers | (1,921) | (1,183)
Plan participants | 223 | 28
Benefit payments | (1,834) | (2,044)
Settlements | (1,745) | (2,722)
Business combinations and divestments | 15 | 127
Closing balance | 108,188 | 102,434
Plan assets [member] |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Opening balance | (69,659) | (64,322)
Adjustment | (2,776) |
Opening balance adjusted | (72,435) | (62,322)
Included in the income statement |  |
Interest cost/income (+/–) | (1,454) | (1,938)
Taxes and administrative expenses | 29 | 49
Other | 2 | 2
Components of defined benefit cost recognized | (1,423) | (1,887)
Remeasurements |  |
Return on plan assets excluding amounts in interest expense/income | (4,734) | (5,758)
Total remeasurements | (4,734) | (5,758)
Translation difference | 5,249 | (2,076)
Contributions and payments from: |  |
Employers | (3,612) | (321)
Plan participants | (223) | (26)
Benefit payments | 1,834 | 2,044
Settlements | 1,733 | 2,687
Closing balance | kr (73,611) | kr (69,659)

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- Definition Components of defined benefit cost recognized in the income statement. + References No definition available. + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the fair value of reimbursement rights resulting from foreign currency exchange rate changes on plans measured in a currency that is different from the entity's presentation currency. [Refer: At fair value [member]; Reimbursement rights, at fair value] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 141 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141&doctype=Standard -URIDate 2020-01-01 + Details
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