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Business Combinations - Summary of Net Assets Acquired and Total Consideration Transferred Business Combinations (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Acquisitions 2018-2020 [member] |  |  |
Disclosure Of Consideration Transferred Business Combinations [Line Items] |  |  |
Total consideration | kr 9,848 | kr 1,957 | kr 1,314
Net assets acquired |  |  |
Cash and cash equivalents | 314 | 142 | 94
Property, plant and equipment | 55 | 353 | 4
Right-of-use of assets | 126 |  |
Intangible assets | 3,583 | 497 | 481
Investments in associates | 167 | 101 | 64
Other assets | 1,292 | 1,357 | 254
Provisions, incl. post-employment benefits | (16) | (102) |
Other liabilities | (2,781) | (743) | (494)
Total identiﬁable net assets | 2,740 | 1,605 | 403
Costs recognized in net income |  | 153 |
Goodwill | 7,108 | 199 | 911
Total | 9,848 | 1,957 | 1,314
Acquisition-related costs | 92 | kr 85 | kr 24
Cradlepoint [member] |  |  |
Disclosure Of Consideration Transferred Business Combinations [Line Items] |  |  |
Total consideration | 9,498 |  |
Net assets acquired |  |  |
Cash and cash equivalents | 297 |  |
Property, plant and equipment | 185 |  |
Intangible assets | 3,330 |  |
Other assets | 1,420 |  |
Other liabilities | (2,797) |  |
Total identiﬁable net assets | 2,435 |  |
Goodwill | 7,063 |  |
Total | kr 9,498 |  |

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