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Equity and Other Comprehensive Income (Loss) - Additional Information (Detail) - SEK (kr) kr / shares in Units, kr in Billions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of classes of share capital [line items] |  |  |
Shares repurchased under stock purchase plan | 0 |  |
Currency translation adjustment | kr (5.4) |  |
Major ordinary share transactions [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Dividend proposed | kr 2.00 | kr 1.50 | kr 1.00
Class A shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Shares quota value | kr 5.00 |  |
Voting rights of share holders | one vote per share |  |
Class B shares [member] |  |  |
Disclosure of classes of share capital [line items] |  |  |
Shares quota value | kr 5.00 |  |
Voting rights of share holders | one tenth of one vote per share |  |
Treasury shares | 6,043,960 | 19,853,247 | 37,057,039

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