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Post-Employment Benefits - Additional Information (Detail) - SEK (kr) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2020
Disclosure Of Employee Benefits [Line Items] |  |  |  |
Actuarial losses on defined benefit obligations | kr 9,247,000,000 | kr 12,443,000,000 |  |
Remeasurement gains on defined benefit obligations | kr 4,734,000,000 | kr 5,758,000,000 |  |
Percentage Alecta's of collective funding ratio | 148.00% | 148.00% |  |
Percentage of company's share of Alecta's saving premiums | 0.20% |  |  |
Percentage of maximum pension liability relation to PRI pensionsgaranti | 2.00% |  |  |
Amount of pledged business mortgage | kr 6,100,000,000 |  |  |
Description of terms and conditions of financial assets pledged as collateral for liabilities or contingent liabilities | Contingent liabilities include the Company’s mutual responsibility as a credit insured company of PRI Pensionsgaranti in Sweden. This mutual responsibility can only be imposed in the instance that PRI Pensionsgaranti has consumed all of its assets, and it amounts to a maximum of 2% of the Company’s pension liability in Sweden. The Company has a pledged business mortgage of SEK 6.1 billion to PRI Pensionsgaranti. |  |  |
Pension cost for defined contribution plans | kr 2,178,000,000 | kr 2,734,000,000 | kr 2,725,000,000 |
COVID-19 pandemic [member] |  |  |  |
Disclosure Of Employee Benefits [Line Items] |  |  |  |
Pension cost for defined contribution plans | kr 3,000,000,000 |  |  |
Alecta [member] |  |  |  |
Disclosure Of Employee Benefits [Line Items] |  |  |  |
Percentage of total share of active members in Alecta | 2.00% |  |  |
Expected contribution to Alectas plan | kr 171,000,000 |  |  |
Sweden [member] |  |  |  |
Disclosure Of Employee Benefits [Line Items] |  |  |  |
Pension cost for defined contribution plans | kr 963,000,000 | kr 953,000,000 | kr 937,000,000 |
Discount rate | 0.50% | 0.90% |  |
Discount rates based upon Swedish covered bonds | 1.50% | 1.80% |  |
Decrease in defined benefit obligation resulting from discount rates based upon Swedish covered bonds | kr 11,800,000,000 | kr 9,800,000,000 |  |
Bottom of range [member] |  |  |  |
Disclosure Of Employee Benefits [Line Items] |  |  |  |
Percentage Alecta's of collective funding ratio ranges | 125.00% |  |  |
Top of Range [member] |  |  |  |
Disclosure Of Employee Benefits [Line Items] |  |  |  |
Percentage Alecta's of collective funding ratio ranges | 175.00% |  |  |
Ericsson Pensionsstiftelse [member] |  |  |  |
Disclosure Of Employee Benefits [Line Items] |  |  |  |
Percentage of defined benefit plans | 48.00% | 45.00% |  |
Percentage of defined benefit plans | 100.00% |  |  |
Other Plans [member] |  |  |  |
Disclosure Of Employee Benefits [Line Items] |  |  |  |
Net liability recognized |  |  |  | kr 0

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- Definition Decrease in defined benefit obligation resulting from discount rates based upon Swedish covered bonds. + References No definition available. + Details
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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&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 description of the terms and conditions relating to financial assets pledged as collateral for liabilities or contingent liabilities. [Refer: Financial assets pledged as collateral for liabilities or contingent liabilities; Contingent liabilities [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 14 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_14_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 147 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_147_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 148 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_148_d_iii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), 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 i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_141_c_i&doctype=Standard -URIDate 2020-01-01 + Details
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