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Financial Assets, Non-current - Summary of Financial Assets, Non-current (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of financial assets [line items] |  |
Opening balance | kr 1,432 | kr 1,515
Opening balance | 20,354 | 23,982
Closing balance | 1,519 | 1,432
Closing balance | 21,613 | 20,354
Other investment in shares and participations [member] | Financial assets, non-current [member] |  |
Disclosure of financial assets [line items] |  |
Opening balance | 1,432 | 1,515
Additions | 123 | 62
Disposals/repayments/deductions | (43) |
Revaluation | 12 | (149)
Translation differences | (5) | 4
Closing balance | 1,519 | 1,432
Interest bearing securities, non-current [member] | Financial assets, non-current [member] |  |
Disclosure of financial assets [line items] |  |
Opening balance | 20,354 | 23,982
Additions | 11,091 | 18,484
Disposals/repayments/deductions | (5,021) | (19,995)
Revaluation | (72) | (33)
Reclassification | (4,739) | (2,084)
Closing balance | 21,613 | 20,354
Other financial assets, non-current [member] | Financial assets, non-current [member] |  |
Disclosure of financial assets [line items] |  |
Opening balance | 5,614 | 6,870
Additions | 893 | 523
Disposals/repayments/deductions | (913) | (703)
Change in value in funded pension plans | 51 | (133)
Revaluation | (53) | 154
Reclassification | (271) | (1,155)
Translation differences | (479) | 58
Closing balance | kr 4,842 | kr 5,614

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