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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, 2024
Dec. 31, 2023
Jan. 01, 2024
Jan. 01, 2023
Disclosure of Information About Board Management and Employees [line items]        
Board fee description The Annual General Meeting 2024 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 4,650,892      
Number of shares outstanding 3,348,251,735 3,344,151,735 3,344,151,735 3,334,151,735
Accounted debt kr 28,661,785      
Percentage Of Severance Pay 50.00%      
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 kr 34,200,000 kr 35,400,000    
Class B shares [member]        
Disclosure of Information About Board Management and Employees [line items]        
Weighted average market price kr 56.11 kr 60.29    
Number of shares outstanding 3,086,495,752 3,082,395,752 3,082,395,752 3,072,395,752
Synthetic shares [member]        
Disclosure of Information About Board Management and Employees [line items]        
Number of shares outstanding 249,435      
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 4,640,000      
Other directors [member] | Board fees [member]        
Disclosure of Information About Board Management and Employees [line items]        
Fee and commission expense 1,175,000      
Chairman of audit committee [member] | Board fees [member]        
Disclosure of Information About Board Management and Employees [line items]        
Fee and commission expense 540,000      
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 310,000      
Chairman of enterprise business and technology committee [member] | Board fees [member]        
Disclosure of Information About Board Management and Employees [line items]        
Fee and commission expense 230,000      
Other non-employee members of enterprise business and technology committee [member] | Board fees [member]        
Disclosure of Information About Board Management and Employees [line items]        
Fee and commission expense 200,000      
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 220,000      
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 195,000