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Financial Risk Management - Summary of Net Exposure for Largest Currencies Impact on Sales (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Cash flow hedges [member]
Disclosure Of Currency Exposure [Line Items]
Hedged Sales Volume	$ 2,467	$ 2,462

X

- Definition

Disclosure of Currency Exposure [line items]

+ References

No definition available.

+ Details

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- Definition

Outstanding cash flow hedge sales volume.

+ References

No definition available.

+ Details

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Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

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- Details

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Namespace Prefix:
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Period Type: