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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Classes Of Employee Benefits Expense [line items]      
Salary kr 154,729,302 kr 152,100,147 kr 128,252,290
Termination benefits   25,503,967  
Annual variable remuneration provision earned for the year 48,399,226 90,908,181 52,507,185
Long-term variable compensation provision 62,256,169 84,813,164 91,962,483
Pension costs 34,759,447 52,104,709 50,455,851
Other benefits 20,404,020 20,302,786 11,755,319
Social charges and taxes 64,768,431 82,824,511 80,103,179
Total 385,316,595 508,557,465 415,036,307
The President and CEO [member]      
Classes Of Employee Benefits Expense [line items]      
Salary 19,520,568 19,154,852 18,208,859
Long-term variable compensation provision 31,708,587 41,125,015 43,701,650
Pension costs 10,151,804 9,856,121 9,569,049
Other benefits 828,287 135,743 555,688
Social charges and taxes 19,546,145 22,079,378 22,633,474
Total 81,755,391 92,351,109 94,668,720
Other Members of Executive Team [member]      
Classes Of Employee Benefits Expense [line items]      
Salary 135,208,734 132,945,295 110,043,431
Termination benefits   25,503,967  
Annual variable remuneration provision earned for the year 48,399,226 90,908,181 52,507,185
Long-term variable compensation provision 30,547,582 43,688,149 48,260,833
Pension costs 24,607,643 42,248,588 40,886,802
Other benefits 19,575,733 20,167,043 11,199,631
Social charges and taxes 45,222,286 60,745,133 57,469,705
Total kr 303,561,204 kr 416,206,356 kr 320,367,587