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Information Regarding Members of the Board of Directors and Group Management - Additional Information (Detail) - SEK (kr) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Information About Board Management and Employees [line items] |  |  |
Board fee description | The Annual General Meeting 2020 resolved that non-employee Directors may choose to receive the Board fee (i.e., exclusive of Committee fee) as follows: i) 25% of the Board fee in cash and 75% in the form of synthetic shares, with a value corresponding to 75% of the Board fee at the time of allocation, ii) 50% in cash and 50% in the form of synthetic shares, or iii) 75% in cash and 25% in the form of synthetic shares. Directors may also choose not to participate in the synthetic share program and receive 100% of the Board fee in cash. Committee fees are always paid in cash. |  |
Number of trading days | 5 days |  |
Remuneration excluding social security charges |  | kr 1,540,373 |
Number of shares outstanding | 3,334,151,735 |  | 3,334,151,735
Accounted debt | kr 32,635,067 |  |
Other Members of Executive Team [member] |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |
Commitments for defined benefit based pensions including disability and survivor's pension | 45,600,000 | 44,600,000 |
Commitments related to ITP and early retirement | 32,000,000 | 32,600,000 |
Commitment to disability and survivors pensions | kr 13,600,000 | kr 11,900,000 |
Class B shares [member] |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |
Weighted average market price | kr 8,274 | kr 77.96 |
Number of shares outstanding | 3,072,395,752 |  |
Synthetic shares [member] |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |
Number of shares outstanding | 326,173 |  |
Board and committee meeting attendance fee [member] |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |
Fee and commission expense | kr 1,500 |  |
Chairman [member] | Board fees [member] |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |
Fee and commission expense | 4,075,000 |  |
Chairman [member] | Committee fees [member] |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |
Fee and commission expense | 200,000 |  |
Chairman [member] | Member of remuneration committee [member] |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |
Fee and commission expense | 175,000 |  |
Other directors [member] | Board fees [member] |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |
Fee and commission expense | 1,020,000 |  |
Chairman of audit committee [member] | Board fees [member] |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |
Fee and commission expense | 400,000 |  |
Other non-employee members of audit committee [member] | Board fees [member] |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |
Fee and commission expense | 250,000 |  |
Chairmen of the finance and remuneration committees [member] | Board fees [member] |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |
Fee and commission expense | 200,000 |  |
Other non-employee members of finance and remuneration committees [member] | Board fees [member] |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |
Fee and commission expense | kr 175,000 |  |

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