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Financial Risk Management and Financial Instruments - Summary of Immediate Impact on Net Loss Before Tax (Details) kr in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 SEK (kr) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 SEK (kr) | Dec. 31, 2019 USD ($)
Disclosure of detailed information about financial instruments [abstract] |  |  |  |
(Increase)/decrease in loss before tax | kr (13) | $ 67 | kr (13) | $ 121

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- Definition Increase (decrease) in loss before income taxes resulting from a specified percentage change in closing exchange rate of the specified currency. + References No definition available. + Details
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- References No definition available. + Details
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