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Share Based Compensation - Summary of Executive Performance Stock Plan Targets (Detail) - SEK (kr) kr in Billions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2016
Disclosure of Executive Performance Stock Plan Targets [line items] |  |
Growth (net sales growth) |  | kr 246.9
Margin (operating income growth) |  | kr 24.8
Compound annual growth rate, Growth (net sales growth) | (5.13%) |
Margin (operating income growth) | (28.00%) |
Cash ﬂow (cash conversion) | 66.67% |
Year 1 [member] |  |
Disclosure of Executive Performance Stock Plan Targets [line items] |  |
Cash ﬂow (cash conversion) |  | 70.00%
Year 2 [member] |  |
Disclosure of Executive Performance Stock Plan Targets [line items] |  |
Cash ﬂow (cash conversion) |  | 70.00%
Bottom of range [member] | Year 3 [member] |  |
Disclosure of Executive Performance Stock Plan Targets [line items] |  |
Compound annual growth rate, Growth (net sales growth) |  | 2.00%
Margin (operating income growth) |  | 5.00%
Cash ﬂow (cash conversion) |  | 70.00%
Top of range [member] | Year 3 [member] |  |
Disclosure of Executive Performance Stock Plan Targets [line items] |  |
Compound annual growth rate, Growth (net sales growth) |  | 6.00%
Margin (operating income growth) |  | 15.00%

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