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Share Based Compensation - Additional Information (Detail) kr / shares in Units, kr in Millions | 12 Months Ended
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Dec. 31, 2021 SEK (kr) Employee Country kr / shares shares | Dec. 31, 2020 SEK (kr) Employee kr / shares | Dec. 31, 2019 Employee kr / shares shares | Dec. 31, 2018 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% | 200.00% |  |
Compensation expense charged | kr | kr 3,607 |  |  |  |
share price at vesting | kr / shares | kr 109.80 | kr 111.78 |  |  |
Payout amount at vesting | kr | kr 1,618 |  |  |  |
Strike price | kr / shares |  |  | kr 87.97 |  |
Reporting year [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Compensation expense charged | kr | 1,346 |  |  |  |
Provisions for cash settled plans | kr | 1,591 | kr (2,107) |  |  |
Social Charges included in the provision for cash-settled plans | kr | 190 | kr 227 |  |  |
No compensation expenses recognized during the period |  |  | four-year period |  |
Purchased call options [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Number of shares issued | shares |  |  | 128,452 |  | 1,000,000
Purchase of options shares | shares |  |  |  |  | 2,000,000
Purchase price | kr / shares |  |  | kr 15.57 |  | kr 0.49
No compensation expenses recognized during the period |  |  |  |  | seven-year period
Key contributor retention plan [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Compensation expense charged | kr | 1,129 |  |  |  |
Executive performance plan [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Compensation expense charged | kr | kr 124 |  |  |  |
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 2021 [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Number of senior managers who selected for plan | 159 |  |  |  |
Executive Performance Plan 2021 [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 2021 [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% |  |  |  |
Ericsson Share Purchase Plan [Member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Number of countries launched the plan | Country | 58 |  |  |  |
Number of eligible employees | 58,900 |  |  |  |
Stock issued during period value shares issued | shares | 50,000 |  |  |  |
Cash payment percentage out of contribution amount | 15.00% |  |  |  |
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% |
Senior Managers [member] | Executive performance plan [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Number of awards | three-year |  |  |  |
The President and CEO [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Compensation expense charged | kr | kr 93 |  |  |  |
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 Plan 2021 [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. |  |  |  |
Employee retention period | 3 years |  |  |  |
Number of employees who selected for plan | 7,246 |  |  |  |
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. 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). |  |  |  |
Employee retention period |  |  | 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 | 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 | 25.00% |  |  |  |
Retention Of Key Employees | Key Contributor Plan2019 | 2024 [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 |
Performance share awards [member] | The President and CEO [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Percentage value of awards on annual base salary | 190.00% | 180.00% | 180.00% | 180.00% |
Performance share awards [member] | Other participants [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] | Other participants [member] | Bottom of range [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% |
Performance share awards [member] | Other participants [member] | Top of range [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% |
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% |
Long-term variable compensation program [member] |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |
Vesting period | 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 |  |  |  |

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