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Financial Risk Management - Schedule of Capital Objectives-Related Information (Detail) - SEK (kr) kr in Billions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Capital Objectives Related Information [Line Items] |  |
Free cash ﬂow before M&A | kr 22.3 | kr 7.6
Positive net cash | kr 41.9 | kr 34.5
Moody's [member] |  |
Disclosure Of Capital Objectives Related Information [Line Items] |  |
Credit rating | Ba1, stable | Ba2,positive
Standard and Poor's [member] |  |
Disclosure Of Capital Objectives Related Information [Line Items] |  |
Credit rating | BBB-, stable | BB+,positive
Fitch [member] |  |
Disclosure Of Capital Objectives Related Information [Line Items] |  |
Credit rating | BBB-, stable | BBB-, stable

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