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Business Combinations - Summary of Net Assets Acquired and Total Consideration Transferred Business Combinations (Detail) - Acquisitions 2019-2021 [member] - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Consideration Transferred Business Combinations [Line Items] |  |  |
Cash and cash equivalents | kr 256 | kr 9,534 | kr 1,815
Others | 0 | 314 | 142
Total consideration | 256 | 9,848 | 1,957
Net assets acquired |  |  |
Cash and cash equivalents | 0 | 314 | 142
Property, plant and equipment | 1 | 55 | 353
Right-of-use of assets | 0 | 126 | 0
Intangible assets | (95) | 3,583 | 497
Investments in associates | 0 | 167 | 101
Other assets | 21 | 1,292 | 1,357
Provisions, incl. post-employment benefits | 0 | (16) | (102)
Other liabilities | (348) | (2,781) | (743)
Total identifiable net assets (liabilities) | (421) | 2,740 | 1,605
Costs recognized in net income | 0 | 0 | 153
Goodwill | 677 | 7,108 | 199
Total | 256 | 9,848 | 1,957
Acquisition-related costs | kr 11 | kr 92 | kr 85

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