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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, 2023 | Dec. 31, 2022 | Jan. 01, 2023 | Jan. 01, 2022
Disclosure of Information About Board Management and Employees [line items] |  |  |  |
Board fee description | The Annual General Meeting 2023 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, 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 6,350,763 |  |  |
Number of shares outstanding | 3,344,151,735 | 3,334,151,735 | 3,334,151,735 | 3,334,151,735
Accounted debt | kr 16,690,551 |  |  |
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 | 35,400,000 | kr 37,600,000 |  |
Commitments related to ITP and early retirement | 28,300,000 | 30,000,000 |  |
Commitment to disability and survivors pensions | kr 7,100,000 | kr 7,700,000 |  |
Class B shares [member] |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |
Weighted average market price | kr 55.34 | kr 59.91 |  |
Number of shares outstanding | 3,082,395,752 | 3,072,395,752 | 3,072,395,752 | 3,072,395,752
Synthetic shares [member] |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |
Number of shares outstanding | 241,184 |  |  |
Board meeting attendance fee [member] |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |
Fee and commission expense | kr 2,250 |  |  |
Committee meeting attendance fee [member] |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |
Fee and commission expense | 1,800 |  |  |
Chairman [member] | Board fees [member] |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |
Fee and commission expense | 4,500,000 |  |  |
Other directors [member] | Board fees [member] |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |
Fee and commission expense | 1,140,000 |  |  |
Chairman of audit committee [member] | Board fees [member] |  |  |  |
Disclosure of Information About Board Management and Employees [line items] |  |  |  |
Fee and commission expense | 495,000 |  |  |
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 | 285,000 |  |  |
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 | 210,000 |  |  |
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 185,000 |  |  |

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