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Equity and Other Comprehensive Income (Loss) - Summary of Other Reserves (Detail) - SEK (kr) kr in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Reserves [Line Items] |  |  |
Opening balance | kr 2,292 | kr 965 |
Translation reserves |  |  |
Changes in translation reserves | (5,400) |  |
Other comprehensive income (loss), net of tax | (8,641) | (3,590) | kr 100
Total comprehensive income (loss) | 8,982 | (1,750) | (6,176)
Closing balance | (2,689) | 2,292 | 965
Translation reserves [member] |  |  |
Other Reserves [Line Items] |  |  |
Opening balance | 2,967 | 893 |
Translation reserves |  |  |
Changes in translation reserves | (5,434) | 1,943 |
Reclassification to profit and loss | 124 | 54 |
Share of other comprehensive income of JV and assoicated companies | (81) | 77 |
Other comprehensive income (loss), net of tax | (5,391) | 2,074 |
Total comprehensive income (loss) | (5,391) | 2,074 |
Closing balance | (2,424) | 2,967 | 893
Cash flow hedge reserve [member] |  |  |
Other Reserves [Line Items] |  |  |
Opening balance | (230) |  |
Cash flow hedge reserve |  |  |
Gains/losses arising during the period | 136 | (290) |
Reclassification to profit and loss | 281 |  |
Translation reserves |  |  |
Tax on items that have been or may be reclassified to profit or loss | (86) | 60 |
Other comprehensive income (loss), net of tax | 331 | (230) |
Total comprehensive income (loss) | 331 | (230) |
Closing balance | 101 | (230) |
Revaluation of borrowings [member] |  |  |
Other Reserves [Line Items] |  |  |
Opening balance | (445) | 72 |
Items that will not be reclassiﬁed to proﬁt or loss |  |  |
Revaluation of borrowings due to change in credit risk | 99 | (651) |
Tax on items that will not be reclassified to profit or loss | (20) | 134 |
Translation reserves |  |  |
Other comprehensive income (loss), net of tax | 79 | (517) |
Total comprehensive income (loss) | 79 | (517) |
Closing balance | (366) | (445) | 72
Other reserves [member] |  |  |
Other Reserves [Line Items] |  |  |
Opening balance | 2,292 | 965 |
Items that will not be reclassiﬁed to proﬁt or loss |  |  |
Revaluation of borrowings due to change in credit risk | 99 | (651) |
Tax on items that will not be reclassified to profit or loss | (20) | 134 |
Cash flow hedge reserve |  |  |
Gains/losses arising during the period | 136 | (290) |
Reclassification to profit and loss | 281 |  |
Translation reserves |  |  |
Changes in translation reserves | (5,434) | 1,943 |
Reclassification to profit and loss | 124 | 54 |
Share of other comprehensive income of JV and assoicated companies | (81) | 77 |
Tax on items that have been or may be reclassified to profit or loss | (86) | 60 |
Other comprehensive income (loss), net of tax | (4,981) | 1,327 | 2,187
Total comprehensive income (loss) | (4,981) | 1,327 | 2,187
Closing balance | kr (2,689) | kr 2,292 | kr 965

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