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Taxes - Tax Loss Carry-forwards (Detail) - SEK (kr) kr in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | kr 21,442 | kr 33,744
Tax value | 4,417 |
2021 [member] |  |
Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | 209 |
Tax value | 43 |
2022 [member] |  |
Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | 142 |
Tax value | 29 |
2023 [member] |  |
Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | 58 |
Tax value | 12 |
2024 [member] |  |
Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | 174 |
Tax value | 36 |
2021-2025 [member] |  |
Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | 156 |
Tax value | 32 |
2026 or later (also includes unlimited carry-forwards) [Member] |  |
Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | 20,703 |
Tax value | kr 4,265 |

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- Definition Tax value of unused tax loss carryforwards. + References No definition available. + Details
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- Definition Unused tax losses for which deferred tax asset recognised. + References No definition available. + Details
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