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Post-Employment Benefits - Summary of Change in the Net Defined Benefit Obligation (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]    
Opening balance kr 22,942 kr 23,211
Included in the income statement    
Current service cost 2,210 2,291
Past service cost and gains and losses on settlements (82) 179
Interest cost/income (+/–) 576 468
Taxes and administrative expenses 64 78
Other 63 101
Components of defined benefit cost recognized 2,831 3,117
Remeasurements    
Return on plan assets excluding amounts in interest expense/income 1,583 (663)
Actuarial gains/losses (–/+) arising from changes in demographic assumptions (229) 267
Actuarial gains/losses (–/+) arising from changes in financial assumptions (4,958) (943)
Experience-based gains/losses (–/+) 2,825 347
Total remeasurements (779) (992)
Translation difference 21 (69)
Contributions and payments from:    
Employers (2,779) (2,331)
Plan participants 5 8
Benefit payments 0 (2)
Settlements 0 0
Other (2) 0
Closing balance 22,239 22,942
Present value of defined benefit obligation [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Opening balance 85,535 83,691
Included in the income statement    
Current service cost 2,210 2,291
Past service cost and gains and losses on settlements   179
Interest cost/income (+/–) 2,953 2,839
Taxes and administrative expenses 0 0
Other 41 108
Components of defined benefit cost recognized 5,122 5,417
Remeasurements    
Return on plan assets excluding amounts in interest expense/income 0 0
Actuarial gains/losses (–/+) arising from changes in demographic assumptions   267
Actuarial gains/losses (–/+) arising from changes in financial assumptions (4,958) (943)
Experience-based gains/losses (–/+) 2,825 347
Total remeasurements (2,362) (329)
Translation difference 1,781 (179)
Contributions and payments from:    
Employers (2,097) (1,737)
Plan participants 362 350
Benefit payments (1,825) (1,294)
Settlements 0 (488)
Other 82 104
Closing balance 86,598 85,535
Plan assets [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Opening balance (62,593) (60,480)
Included in the income statement    
Current service cost 0 0
Past service cost and gains and losses on settlements 0 0
Interest cost/income (+/–) (2,377) (2,371)
Taxes and administrative expenses 64 78
Other 22 (7)
Components of defined benefit cost recognized (2,291) (2,300)
Remeasurements    
Return on plan assets excluding amounts in interest expense/income 1,583  
Actuarial gains/losses (–/+) arising from changes in demographic assumptions 0 0
Actuarial gains/losses (–/+) arising from changes in financial assumptions 0 0
Experience-based gains/losses (–/+) 0 0
Total remeasurements 1,583 (663)
Translation difference (1,760) 110
Contributions and payments from:    
Employers (682) (594)
Plan participants (357) (342)
Benefit payments 1,825 1,292
Settlements 0 488
Other (84) (104)
Closing balance kr (64,359) kr (62,593)