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Taxes - Summary of Equity and Other Comprehensive Income (Detail) - SEK (kr) kr in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income tax relating to components of other comprehensive income that will not be reclassified to profit or loss [abstract]
Remeasurements of defined benefits pension plans	kr (147)	kr (251)	kr (2,093)
Revaluation of credit risk on borrowings	117	137	(212)
Cash flow hedge reserve	652	(380)	(671)
Non-controlling interests	2		(4)
Total	kr 624	kr (494)	kr (2,980)

X

- Definition

Income tax relating to other individually immaterial components of other comprehensive income one.

+ References

No definition available.

+ Details

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X

- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to changes in the fair value of financial liabilities attributable to a change in the credit risk of those liabilities. [Refer: Credit risk [member]; Other comprehensive income]

+ References

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- References

No definition available.

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X

- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to hedges of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: Other comprehensive income; Reserve of gains and losses on hedging instruments that hedge investments in equity instruments]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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X

- Definition

The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

The amount of income tax relating to an entity's share of other comprehensive income of associates and joint ventures accounted for using the equity method that will be reclassified to profit or loss. [Refer: Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax]

+ References

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