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Financial Income and Expenses - Summary of Financial Income and Expenses (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of detailed information about finance income expense [line items] |  |  |
Contractual interest on ﬁnancial assets | kr 1,897 | kr 717 | kr 360
Financial income | 2,145 | 778 | 691
Net revaluation gains and losses on financial assets | 64 | (146) | 10
Net interest on pension liabilities | (517) | (361) | (262)
Financial expenses | (4,118) | (1,930) | (1,674)
Net revaluation gains and losses on financial liabilities | (134) | 379 | 67
Net foreign exchange gains/losses | (1,020) | (1,259) | (1,547)
Financial income and expenses, net | (2,993) | (2,411) | (2,530)
Financial instruments at fair value through profit or loss | 885 | (2,552) | (534)
Financial liabilities designated at fair value through profit or loss | (1,100) | 2,847 | 404
Financial assets at amortized cost [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial income | 403 | 251 | 148
Contractual interest on financial liabilities [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial expenses | (2,282) | (972) | (525)
Contractual interest on financial liabilities at amortized cost [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial expenses | (501) | (128) | (41)
Lease interest expense [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial expenses | (464) | (464) | (426)
Other financial expenses [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial income | 184 | 207 | 321
Financial expenses | kr (721) | kr (512) | kr (528)

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