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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other Reserves [Line Items] |  |  |  |
Opening balance | kr (2,689) |  |  |
Items that will not be reclassiﬁed to proﬁt or loss |  |  |  |
Revaluation of borrowings due to change in credit risk | 31 |  | kr 99 | kr (651)
Tax on items that will not be reclassified to profit or loss | (682) |  | 880 | 1,363
Cash flow hedge reserve |  |  |  |
Gains/losses arising during the period | (542) |  | 136 | (290)
Reclassification to profit and loss | (96) |  | 281 |
Translation reserves |  |  |  |
Changes in translation reserves | 3,342 | [1] | (5,376) | 1,925
Reclassification to profit and loss | 46 | [1] | 124 | 54
Share of other comprehensive income of JV and associated companies | 28 |  | (81) | 131
Tax on items that have been or may be reclassified to profit or loss | 126 |  | (86) | 60
Other comprehensive income (loss), net of tax | 5,790 |  | (8,641) | (3,590)
Total comprehensive income (loss) | 28,770 |  | 8,982 | (1,750)
Closing balance | 454 |  | (2,689) |
Reserve of exchange differences on translation [member] |  |  |  |
Other Reserves [Line Items] |  |  |  |
Opening balance | (2,424) |  | 2,967 |
Items that will not be reclassiﬁed to proﬁt or loss |  |  |  |
Revaluation of borrowings due to change in credit risk | 0 |  | 0 |
Tax on items that will not be reclassified to profit or loss | 0 |  | 0 |
Cash flow hedge reserve |  |  |  |
Gains/losses arising during the period | 0 |  | 0 |
Reclassification to profit and loss | 0 |  | 0 |
Translation reserves |  |  |  |
Changes in translation reserves | 3,556 |  | (5,434) |
Reclassification to profit and loss | 46 |  | 124 |
Share of other comprehensive income of JV and associated companies | 28 |  | (81) |
Tax on items that have been or may be reclassified to profit or loss | 0 |  | 0 |
Other comprehensive income (loss), net of tax | 3,630 |  | (5,391) |
Total comprehensive income (loss) | 3,630 |  | (5,391) |
Closing balance | 1,206 |  | (2,424) | 2,967
Reserve of cash flow hedges [member] |  |  |  |
Other Reserves [Line Items] |  |  |  |
Opening balance | 101 |  | (230) |
Items that will not be reclassiﬁed to proﬁt or loss |  |  |  |
Revaluation of borrowings due to change in credit risk | 0 |  | 0 |
Tax on items that will not be reclassified to profit or loss | 0 |  | 0 |
Cash flow hedge reserve |  |  |  |
Gains/losses arising during the period | (542) |  | 136 |
Reclassification to profit and loss | (96) |  | 281 |
Translation reserves |  |  |  |
Changes in translation reserves | 0 |  | 0 |
Reclassification to profit and loss | 0 |  | 0 |
Share of other comprehensive income of JV and associated companies | 0 |  | 0 |
Tax on items that have been or may be reclassified to profit or loss | 126 |  | (86) |
Other comprehensive income (loss), net of tax | (512) |  | 331 |
Total comprehensive income (loss) | (512) |  | 331 |
Closing balance | (411) |  | 101 | (230)
Revaluation Of Borrowings [Member] |  |  |  |
Other Reserves [Line Items] |  |  |  |
Opening balance | (366) |  | (445) |
Items that will not be reclassiﬁed to proﬁt or loss |  |  |  |
Revaluation of borrowings due to change in credit risk | 31 |  | 99 |
Tax on items that will not be reclassified to profit or loss | (6) |  | (20) |
Cash flow hedge reserve |  |  |  |
Gains/losses arising during the period | 0 |  | 0 |
Reclassification to profit and loss | 0 |  | 0 |
Translation reserves |  |  |  |
Changes in translation reserves | 0 |  | 0 |
Reclassification to profit and loss | 0 |  | 0 |
Share of other comprehensive income of JV and associated companies | 0 |  | 0 |
Tax on items that have been or may be reclassified to profit or loss | 0 |  | 0 |
Other comprehensive income (loss), net of tax | 25 |  | 79 |
Total comprehensive income (loss) | 25 |  | 79 |
Closing balance | (341) |  | (366) | (445)
Other reserves [member] |  |  |  |
Other Reserves [Line Items] |  |  |  |
Opening balance | (2,689) |  | 2,292 |
Items that will not be reclassiﬁed to proﬁt or loss |  |  |  |
Revaluation of borrowings due to change in credit risk | 31 |  | 99 | (651)
Tax on items that will not be reclassified to profit or loss | (6) |  | (20) | 134
Cash flow hedge reserve |  |  |  |
Gains/losses arising during the period | (542) |  | 136 | (290)
Reclassification to profit and loss | (96) |  | 281 |
Translation reserves |  |  |  |
Changes in translation reserves | 3,556 | [1] | (5,434) | 1,889
Reclassification to profit and loss | 46 | [1] | 124 | 54
Share of other comprehensive income of JV and associated companies | 28 |  | (81) | 131
Tax on items that have been or may be reclassified to profit or loss | 126 |  | (86) | 60
Other comprehensive income (loss), net of tax | 3,143 |  | (4,981) | 1,327
Total comprehensive income (loss) | 3,143 |  | (4,981) | 1,327
Closing balance | kr 454 |  | kr (2,689) | kr 2,292
[1] | Changes in cumulative translation adjustments include changes regarding revaluation of goodwill in local currency of SEK 2,646 million (SEK -3,359 million in 2020 and SEK 966 million in 2019), and realized gain/losses net from divested/liquidated companies, SEK 46 million (SEK 124 million in 2020 and SEK 54 million in 2019).

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