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Equity and Other Comprehensive Income (Loss) - Summary of Reconciliation of Number of Shares (Detail) - SEK (kr) kr in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Number of Shares Outstanding |  |  |  |
Number of shares | 3,334,151,735 |  |  |
Capital stock | kr 107,099 | kr 85,177 | kr 81,878 | kr 87,770
Capital stock [member] |  |  |  |
Number of Shares Outstanding |  |  |  |
Capital stock | kr 16,672 | kr 16,672 | kr 16,672 | kr 16,672

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