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Net Sales - Summary of Net Sales (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of net sales [line items] |  |  |
Net sales | kr 232,390 | kr 227,216 | kr 210,838
IPR licensing revenues | 9,975 | 9,631 | 7,954
Of which export sales from Sweden | 132,269 | 120,822 | 109,969
Hardware [member] |  |  |
Disclosure of net sales [line items] |  |  |
Net sales | 96,294 | 86,130 | 76,792
Software [member] |  |  |
Disclosure of net sales [line items] |  |  |
Net sales | 49,892 | 48,036 | 44,633
Services [member] |  |  |
Disclosure of net sales [line items] |  |  |
Net sales | kr 86,204 | kr 93,050 | kr 89,413

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