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Share Based Compensation - Additional Information (Detail) kr / shares in Units, kr in Millions |  | 12 Months Ended
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May 18, 2017 | Dec. 31, 2020 SEK (kr) Plan Country kr / shares shares | Dec. 31, 2019 kr / shares shares | Dec. 31, 2018 | Dec. 31, 2017 Employee | Dec. 31, 2016 kr / shares shares
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage of performance share awards granted |  | 200.00% | 200.00% |  |  |
Compensation expense charged | kr |  | kr 3,391 |  |  |  |
Number of plans vested under share based compensation arrangement | Plan |  | 3 |  |  |  |
share price at vesting | kr / shares |  | kr 84.12 |  |  |  |
Payout amount at vesting | kr |  | kr 1,150 |  |  |  |
Compound annual growth rate, Growth (net sales growth) |  | (5.13%) |  |  |  |
Margin (compound annual operating income growth rate) |  | (28.00%) |  |  |  |
Cash ﬂow (cash conversion) |  | 66.67% |  |  |  |
Number of shares issued |  |  | 1,820,800 |  |  |
Average price of share | kr / shares |  |  | kr 89.52 |  |  |
Strike price | kr / shares |  |  | kr 87.97 |  |  | kr 80
Reporting year [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Compensation expense charged | kr |  | kr 1,566 |  |  |  |
Provisions for cash settled plans | kr |  | 2,107 |  |  |  |
Social Charges included in the provision for cash-settled plans | kr |  | kr 227 |  |  |  |
Purchased call options [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Number of shares issued |  |  | 128,452 |  |  | 1,000,000
Purchase of options shares |  |  |  |  |  | 2,000,000
Purchase price | kr / shares |  |  | kr 15.57 |  |  | kr 0.49
No compensation expenses recognized during the period |  |  | four-year period |  |  | seven-year period
Class B shares [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Number of exercise and matching and vesting shares transferred |  | 2,700,000 |  |  |  |
Percentage of shares outstanding |  | 0.10% |  |  |  |
Number of shares outstanding |  | 3,328,000,000 |  |  |  |
Number of treasury shares |  | 6,000,000 |  |  |  |
Key contributor retention plan [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Matching share for each contribution share purchased |  | 1 |  |  |  |
Executive Performance Plan 2020 (EPP 2020) [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Number of senior managers who selected for plan |  | 155 |  |  |  |
Executive Performance Plan 2020 (EPP 2020) [member] | All Countries Except USA [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage of regular award level |  | 15.00% |  |  |  |
Percentage of high award level |  | 25.00% |  |  |  |
Executive Performance Plan 2020 (EPP 2020) [member] | USA [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage of regular award level |  | 25.00% |  |  |  |
Percentage of high award level |  | 35.00% |  |  |  |
Executive Performance Plan 2019 (EPP 2019) [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Number of senior managers who selected for plan |  |  | 161 |  |  |
Percentage of regular award level |  |  | 15.00% |  |  |
Percentage of high award level |  |  | 22.50% |  |  |
Executive Performance Plan 2018 (EPP 2018) [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Number of senior managers who selected for plan |  |  |  | 171 |  |
Percentage of regular award level |  |  |  | 15.00% |  |
Percentage of high award level |  |  |  | 22.50% |  |
Executive Performance Plan 2017 (EPP 2017) [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Number of senior managers who selected for plan |  |  |  |  | 452 |
Percentage of regular award level |  |  |  |  | 15.00% |
Percentage of high award level |  |  |  |  | 22.50% |
Executive Performance Stock Plan [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage of employees offered participation |  | 0.50% |  |  |  |
Bottom of range [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Share based payment arrangement long-term variable compensation programs performance period |  | 3 years |  |  |  |
Bottom of range [member] | Executive Performance Stock Plan [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Number of performance matching shares to senior managers in addition to ordinary shares |  | 4 |  |  |  |
Top of range [member] | Key contributor retention plan [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Employees nominated |  | 10.00% |  |  |  |
Top of range [member] | Executive Performance Stock Plan [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Number of performance matching shares to senior managers in addition to ordinary shares |  | 6 |  |  |  |
Senior Managers [member] | Executive performance plan [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |
Number of awards |  | two award levels |  |  |  |
The President and CEO [member] | Performance share awards [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage value of awards on annual base salary |  | 180.00% | 180.00% | 180.00% |  |
Other participants [member] | Performance share awards [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage value of awards on annual base salary |  |  |  |  | 22.50% |
Other participants [member] | Bottom of range [member] | Performance share awards [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage value of awards on annual base salary |  | 30.00% | 30.00% | 30.00% | 30.00% |
Other participants [member] | Top of range [member] | Performance share awards [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage value of awards on annual base salary |  | 70.00% | 70.00% | 70.00% | 70.00% |
Board of directors [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage of performance share awards granted |  |  |  | 200.00% |  |
Percentage of vesting level of LTV program |  |  |  | 200.00% |  |
Retention Of Key Employees | Key Contributor Plan2019 |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Number of awards |  |  | three award levels at 10%, 25% and 30% of the participants’ annual gross salary |  |  |
Employee retention period |  | 3 years | 3 years |  |  |
Employee retention payment plan |  | —25% of the award to be paid at the end of the first year, —25% of the award to be paid at the end of the second year, and —the remaining 50% of the award to be paid at the end of the third year. |  |  |  |
Number of employees who selected for plan |  |  | 6,941 |  |  |
Retention Of Key Employees | Key Contributor Plan2019 | 2021 [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage of award to be paid |  | 25.00% |  |  |  |
Retention Of Key Employees | Key Contributor Plan2019 | 2022 [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage of award to be paid |  | 25.00% |  |  |  |
Retention Of Key Employees | Key Contributor Plan2019 | 2023 [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage of award to be paid |  | 50.00% |  |  |  |
Retention Of Key Employees | Key Contributor Plan 2020 (KC Plan 2020) [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Number of awards |  | three award levels at 10%, 25% and 30% of the participants’ annual gross salary. The total service period is three years, however the payout is distributed over the entire service period with staggered payments as explained under Key Contributor Plans (KC Plans). |  |  |  |
Number of employees who selected for plan |  | 7,007 |  |  |  |
Retention Of Key Employees | Key contributor plan 2018 [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Number of awards |  | two award levels at 10% and 25% of the participants’ annual gross salary |  |  |  |
Employee retention period |  |  |  | 3 years |  |
Number of employees who selected for plan |  |  |  | 5,886 |  |
Retention Of Key Employees | Key contributor plan 2017 [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Number of awards |  | two award levels at 10% and 25% of the participants’ annual gross salary. |  |  |  |
Employee retention period |  |  |  |  | 3 years |
Number of employees who selected for plan | Employee |  |  |  |  | 6,876 |
Performance share awards [member] | The President and CEO [member] | LTV 2017 [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage value of awards on annual base salary | 180.00% |  |  |  |  |
Performance share awards [member] | Other participants [member] | LTV 2017 [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage value of awards on annual base salary | 22.50% |  |  |  |  |
Performance share awards [member] | Board of directors [member] | LTV 2018 [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage of performance share awards granted |  |  |  | 200.00% |  |
Absolute TSR [member] | Board of directors [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage of vesting level of LTV program |  |  |  | 26.92% |  |
Absolute TSR [member] | Board of directors [member] | LTV 2017 [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage of performance share awards granted |  |  |  |  | 200.00% |
Percentage of vesting level of LTV program |  |  |  |  | 21.34% |
Relative TSR [member] | Board of directors [member] | LTV 2017 [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Percentage of performance share awards granted |  |  |  |  | 191.04% |
Percentage of vesting level of LTV program |  |  |  |  | 195.52% |
The President and CEO and The ET [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Compensation expense charged | kr |  | kr 83 |  |  |  |
Long-term variable compensation program [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Vesting period |  | over the service period of three years. |  |  |  |
Long-term variable compensation program [member] | Performance share awards [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |
Vesting description |  | Awards under LTV (Performance Share Awards) are granted to the participants, provided that certain performance conditions are met, to receive a number of shares, free of charge, following expiration of a three-year vesting period (vesting period). |  |  |  |
Period of employment eligibility for awards |  | 3 years |  |  |  |
Executive performance plan [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Compensation expense charged | kr |  | kr 185 |  |  |  |
Key contributor plan [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Compensation expense charged | kr |  | kr 1,298 |  |  |  |
Stock Purchase Plan [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Description of type of plan |  | If the contribution shares were retained by the employee for three years after the investment and their employment with the Ericsson Group continued during that time, then the employee’s shares are to be matched with a corresponding number of Ericsson B shares or ADSs free of consideration. Employees in 100 countries participated in the SPP |  |  |  |
Stock purchase plan contribution period |  | 12 months |  |  |  |
Employee retained contribution shares after investment, Period |  | 3 years |  |  |  |
Number of countries participated in stock purchase plan | Country |  | 100 |  |  |  |
Stock Purchase Plan [member] | Top of range [member] | Employees [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Gross fixed salary |  | 7.50% |  |  |  |
2016 Executive performance plan [member] |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |
Service period |  | 3 years |  |  |  |
Matching result percentage |  | 22.22% |  |  |  |

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