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Other Operating Income and Expenses - Schedule of Other Operating Income and Expenses (Detail) - SEK (kr)
kr in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other operating income      
Gains on sales of intangible assets and PP&E kr 13 kr 17 kr 85
Gains on investments and sale of operations 409 136 701
Other operating income 2,807 841 445
Total other operating income 3,229 994 1,231
Other operating expenses      
Losses on sales of intangible assets and PP&E (21)   (54)
Losses on investments and sale of operations (554) (421) (445)
Impairment of goodwill (1,260) (31,897) 0
Other operating expenses (764) (541) (3,994)
Total other operating expenses kr (2,599) kr (32,859) kr (4,493)