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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
	Dec. 31, 2021 SEK (kr)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 SEK (kr)	Dec. 31, 2020 USD ($)
Disclosure of detailed information about financial instruments [abstract]
(Increase)/decrease in loss before tax	kr (14)	$ 94	kr (13)	$ 67

X

- 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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Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration