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Share Based Compensation - Additional Information (Detail) kr / shares in Units, kr in Millions, $ in Millions |  | 12 Months Ended
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Jan. 01, 2019 Employee | Dec. 31, 2023 SEK (kr) Employee Participants Country kr / shares shares | Dec. 31, 2022 USD ($) Employee Country Participants | Dec. 31, 2022 SEK (kr) Employee Country Participants | Dec. 31, 2021 Employee | Dec. 31, 2020 Employee | Dec. 31, 2019 Employee kr / shares shares | Dec. 31, 2016 kr / shares shares
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Percentage of high award level |  |  |  |  |  |  | 22.50% |
share price at vesting | kr / shares |  | kr 60.31 |  |  |  |  |  |
Payout amount at vesting | kr |  | kr 604.4 |  |  |  |  |  |
Strike price | kr / shares |  |  |  |  |  |  | kr 87.97 |
Reporting year [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Compensation expense charged | kr |  | 1,371.0 |  | kr 450.0 |  |  |  |
Provisions for cash settled plans | kr |  | 1,584.0 |  | 985.0 |  |  |  |
Social Charges included in the provision for cash-settled plans | kr |  | kr 153.0 |  | kr (120.0) |  |  |  |
No compensation expenses recognized during the period |  |  |  |  |  |  | four-year period |
Purchased call options [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Purchase of options shares | 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
Option extended exercise period |  | 1 year |  |  |  |  |  |
Option exercise period |  | 1 year |  |  |  |  |  |
Key contributor retention plan [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Compensation expense charged | kr |  | kr 1,250.0 |  |  |  |  |  |
Executive performance plan [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Compensation expense charged | kr |  | kr 39.0 |  |  |  |  |  |
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 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% |  |  |
Ericsson Share Purchase Plan [Member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Number of countries launched the plan | Country |  | 77 | 77 | 77 |  |  |  |
Stock issued during period value shares issued | shares |  | 50,000 |  |  |  |  |  |
Cash payment percentage out of contribution amount |  | 15.00% |  |  |  |  |  |
Number of eligible employees |  | 77,700 |  |  |  |  |  |
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% |
Executive Performance Plan 2022 [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Number of senior managers who selected for plan |  |  | 165 | 165 |  |  |  |
Senior Managers [member] | Executive performance plan [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Number of awards |  | three-year |  |  |  |  |  |
Board of directors [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Percentage of performance share awards granted |  | 0.00% | 162.76% | 162.76% | 200.00% | 200.00% | 200.00% |
Percentage of vesting level of LTV program |  |  |  |  | 100.00% | 100.00% | 126.35% |
Retention Of Key Employees [member] | Key Contributor Plan 2021 [Member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Number of awards |  |  |  |  | There are 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 [member] | Key Contributor Plan 2019 [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Number of awards |  |  |  |  |  |  | There are 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) and was officially closed in 2022. |
Employee retention period |  |  |  |  |  |  | 3 years |
Number of employees who selected for plan | 6,941 |  |  |  |  |  |  |
Retention Of Key Employees [member] | Key Contributor Plan 2019 [member] | 2023 [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Percentage of award to be paid |  | 25.00% |  |  |  |  |  |
Retention Of Key Employees [member] | Key Contributor Plan 2019 [member] | 2024 [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Percentage of award to be paid |  | 25.00% |  |  |  |  |  |
Retention Of Key Employees [member] | Key Contributor Plan 2019 [member] | 2025 [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Percentage of award to be paid |  | 50.00% |  |  |  |  |  |
Retention Of Key Employees [member] | Key Contributor Plan 2020 (KC Plan 2020) [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Number of awards |  |  |  |  |  | There are 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 |  |
Number of employees who selected for plan |  |  |  |  |  | 7,007 |  |
Retention Of Key Employees [member] | Key Contributor Plan 2023 [Member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Number of awards |  | There are at multiple levels between 10%-50% 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 |  |  |  |  |  |
Number of employees who selected for plan |  | 10,154 |  |  |  |  |  |
Retention Of Key Employees [member] | Key Contributor Plan 2022 [Member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Number of awards |  |  | There are at multiple levels between 10%-40% 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). | There are at multiple levels between 10%-40% 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 | 3 years |  |  |  |
Number of employees who selected for plan |  |  | 7,704 | 7,704 |  |  |  |
Vonage [Member] | Key Contributor Plan 2023 [Member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Employee retention period |  | 2 years |  |  |  |  |  |
Number of employees who selected for plan | Participants |  | 87 |  |  |  |  |  |
Description of award vesting condition |  | vesting is 50%/50% on each annual anniversary |  |  |  |  |  |
Performance share awards [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Percentage of performance share awards granted |  | 19372.00% |  |  |  |  |  |
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% | 190.00% | 190.00% | 190.00% |  |  |
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 |  |  |  |  | 16.17% | 6.65% | 9.00% |
The President and CEO and The ET [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Compensation expense charged | kr |  | kr 82.0 |  |  |  |  |  |
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). |  |  |  |  |  |
Cash Settled Plans [Member] | Key Contributor Plan 2022 [Member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Employee retention period |  |  | 2 years | 2 years |  |  |  |
Value of award to be paid | $ |  |  | $ 4.8 |  |  |  |  |
Number of participants with cash-settled retention plan | Participants |  |  | 95 | 95 |  |  |  |
Cash Settled Plans [Member] | 2023 [member] | Key Contributor Plan 2022 [Member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Percentage of award to be paid |  |  | 50.00% | 50.00% |  |  |  |
Cash Settled Plans [Member] | 2024 [member] | Key Contributor Plan 2022 [Member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Percentage of award to be paid |  |  | 50.00% | 50.00% |  |  |  |
Rest of the Countries [Member] | Executive Performance Plan 2022 [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Percentage of regular award level |  |  | 15.00% | 15.00% |  |  |  |
Percentage of high award level |  |  | 25.00% | 25.00% |  |  |  |
CA [Member] | Executive Performance Plan 2022 [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Percentage of high award level |  |  | 45.00% | 45.00% |  |  |  |
US [member] | Executive Performance Plan 2020 (EPP 2020) [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% |  |
US [member] | Executive Performance Plan 2021 [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% |  |  |
US [member] | Executive Performance Plan 2022 [member] |  |  |  |  |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |  |  |  |  |
Percentage of regular award level |  |  | 35.00% | 35.00% |  |  |  |

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