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Taxes - Tax Loss Carry-forwards (Detail) - SEK (kr) kr in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | kr 19,635 | kr 21,442
Tax value | 4,214 |
2022 [member] |  |
Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | 37 |
Tax value | 9 |
2023 [member] |  |
Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | 49 |
Tax value | 9 |
2024 [member] |  |
Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | 91 |
Tax value | 20 |
2025 [member] |  |
Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | 38 |
Tax value | 7 |
2021-2025 [member] |  |
Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | 9 |
Tax value | 2 |
2027 or later (also includes unlimited carry-forwards) [Member] |  |
Disclosure Of Income Taxes [line items] |  |
Tax loss carry-forwards | 19,411 |
Tax value | kr 4,167 |

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- Definition Tax value of unused tax loss carryforwards. + References No definition available. + Details
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