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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about finance income expense [line items] |  |  |
Contractual interest on ﬁnancial assets | kr 796 | kr 1,395 | kr 580
Financial income | 693 | 1,295 | 151
Net revaluation gains and losses on financial assets | (103) | (100) | (429)
Financial expenses | (2,116) | (2,702) | (2,032)
Net revaluation gains and losses on financial liabilities | 9 | (69) | (27)
Net foreign exchange gains/losses | 827 | (395) | (824)
Financial income and expenses, net | (596) | (1,802) | (2,705)
Financial instruments at fair value through profit or loss | (2,159) | 758 | 887
Financial liabilities designated at fair value through profit or loss | 2,893 | (1,322) | (2,087)
Financial assets at fair value through OCI |  |  | (81)
Financial assets at amortized cost [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial income | 279 | 591 | 422
Contractual interest on financial liabilities [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial expenses | (1,104) | (1,392) | (1,430)
Contractual interest on financial liabilities at amortized cost [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial expenses | (383) | (302) | (474)
Lease interest expense [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial expenses | (490) | (551) |
Other financial expenses [member] |  |  |
Disclosure of detailed information about finance income expense [line items] |  |  |
Financial expenses | kr (531) | kr (690) | kr (575)

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