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Information Regarding Members of the Board of Directors and Group Management - Summary of Remuneration Costs for the President and CEO and Other Members of Executive Team (ET) (Detail) - SEK (kr)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Classes Of Employee Benefits Expense [line items]      
Salary kr 166,406,417 kr 154,729,302 kr 152,100,147
Termination benefits 57,092,817   25,503,967
Annual variable remuneration provision earned for the year 177,605,460 48,399,226 90,908,181
Long-term variable compensation provision 53,409,265 62,256,169 84,813,164
Pension costs 33,116,563 34,759,447 52,104,709
Other benefits 27,768,474 20,404,020 20,302,786
Social charges and taxes 85,776,085 64,768,431 82,824,511
Total 601,175,081 385,316,595 508,557,465
The President and CEO [member]      
Classes Of Employee Benefits Expense [line items]      
Salary 20,526,329 19,520,568 19,154,852
Annual variable remuneration provision earned for the year 15,036,644    
Long-term variable compensation provision 19,780,629 31,708,587 41,125,015
Pension costs 10,151,804 10,151,804 9,856,121
Other benefits 584,168 828,287 135,743
Social charges and taxes 20,762,202 19,546,145 22,079,378
Total 86,841,776 81,755,391 92,351,109
Other Members of Executive Team [member]      
Classes Of Employee Benefits Expense [line items]      
Salary 145,880,088 135,208,734 132,945,295
Termination benefits 57,092,817   25,503,967
Annual variable remuneration provision earned for the year 162,568,816 48,399,226 90,908,181
Long-term variable compensation provision 33,628,636 30,547,582 43,688,149
Pension costs 22,964,759 24,607,643 42,248,588
Other benefits 27,184,306 19,575,733 20,167,043
Social charges and taxes 65,013,883 45,222,286 60,745,133
Total kr 514,333,305 kr 303,561,204 kr 416,206,356