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Net Sales - Summary of Net Sales (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net sales [line items]      
Net sales kr 247,880 kr 263,351 kr 271,546
Of which IPR licensing revenues 13,962 11,101 10,399
Of which export sales from Sweden 133,339 125,242 153,833
Hardware [member]      
Disclosure of net sales [line items]      
Net sales 93,521 99,642 119,215
Software [member]      
Disclosure of net sales [line items]      
Net sales 56,629 59,123 54,809
Services [member]      
Disclosure of net sales [line items]      
Net sales kr 97,730 kr 104,586 kr 97,522