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Equity and Other Comprehensive Income (Loss) - Summary of Capital Stock (Detail) - SEK (kr) kr in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of classes of share capital [line items] |  |  |  |
Capital stock | kr 85,177 | kr 81,878 | kr 87,770 | kr 97,571
Number of shares | 3,334,151,735 |  | 3,334,151,735 |
Class A shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares | 261,755,983 |  |  |
Class B shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Number of shares | 3,072,395,752 |  |  |
Capital stock [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Capital stock | kr 16,672 | kr 16,672 | kr 16,672 | kr 16,672
Capital stock [member] | Class A shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Capital stock | 1,309 |  |  |
Capital stock [member] | Class B shares [member] |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Capital stock | kr 15,363 |  |  |

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