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Share Based Compensation - Summary of Performance Criteria (Detail) - SEK (kr) kr in Billions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Weight | 100.00% | 100.00% | 100.00% | 100.00%
Achieved Vesting Level |  |  |  | 195.52%
Bottom of range [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Vesting Opportunity | 0.00% | 0.00% | 0.00% | 0.00%
Top of range [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Vesting Opportunity | 200.00% | 200.00% | 200.00% | 200.00%
2020 Group operating income [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria | Range (SEK billion): 19.1–27.9 |  |  |
Weight | 50.00% |  |  |
Achievement, value | kr 29.1 |  |  |
2020 Group operating income [member] | Bottom of range [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | January 1, 2020 |  |  |
Vesting Opportunity | 0.00% |  |  |
2020 Group operating income [member] | Top of range [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | December 31, 2020 |  |  |
Vesting Opportunity | 200.00% |  |  |
Absolute TSR [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria | Range: 6%–14% | Range: 6%–14% | Range: 6%–14% | Range: 6%–14%
Weight | 30.00% | 30.00% | 30.00% | 50.00%
Achieved Vesting Level |  |  | 200.00% | 200.00%
Achievement, percentage |  |  | 26.92% | 21.34%
Absolute TSR [member] | Bottom of range [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | January 1, 2020 | January 1, 2019 | January 1, 2018 | January 1, 2017
Vesting Opportunity | 0.00% | 0.00% | 0.00% | 0.00%
Absolute TSR [member] | Top of range [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | December 31, 2022 | December 31, 2021 | December 31, 2020 | December 31, 2019
Vesting Opportunity | 200.00% | 200.00% | 200.00% | 200.00%
Relative TSR [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria | Ranking of Ericsson: 6–2 | Ranking of Ericsson: 7–2 | Ranking of Ericsson: 7–2 | Ranking of Ericsson: 12–5
Weight | 20.00% | 20.00% | 20.00% | 50.00%
Achieved Vesting Level |  |  | 200.00% | 191.04%
Achievement, description |  |  | 1.94 out of 12 | 5.45 out of 18
Relative TSR [member] | Bottom of range [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | January 1, 2020 | January 1, 2019 | January 1, 2018 | January 1, 2017
Vesting Opportunity | 0.00% | 0.00% | 0.00% | 0.00%
Relative TSR [member] | Top of range [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period | December 31, 2022 | December 31, 2021 | December 31, 2020 | December 31, 2019
Vesting Opportunity | 200.00% | 200.00% | 200.00% | 200.00%
2019 Group operating income [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria |  | Range (SEK billion): 10.0–20.0 |  |
Weight |  | 50.00% |  |
Achievement, value |  | kr 20.4 |  |
Achieved Vesting Level |  | 200.00% |  |
2019 Group operating income [member] | Bottom of range [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  | January 1, 2019 |  |
Vesting Opportunity |  | 0.00% |  |
2019 Group operating income [member] | Top of range [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  | December 31, 2019 |  |
Vesting Opportunity |  | 200.00% |  |
2018 Group operating income [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Criteria |  |  | Range (SEK billion): 4.6–9.6 |
Weight |  |  | 50.00% |
Achievement, value |  |  | kr 11.5 |
Achieved Vesting Level |  |  | 200.00% |
2018 Group operating income [member] | Bottom of range [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  |  | January 1, 2018 |
Vesting Opportunity |  |  | 0.00% |
2018 Group operating income [member] | Top of range [member] |  |  |  |
Disclosure of terms and conditions of share based payment arrangement [line Items] |  |  |  |
Performance Period |  |  | December 31, 2018 |
Vesting Opportunity |  |  | 200.00% |

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