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Financial Risk Management - Summary of Committed Credit Facilities (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Multi-currency revolving credit facility [member]
Disclosure Of Line Of Credit Facility [Line Items]
Amount	$ 2,000
Utilized	0
Unutilized	2,000
Liquidity revolving credit facility [Member]
Disclosure Of Line Of Credit Facility [Line Items]
Amount	1,000
Utilized	0
Unutilized	$ 1,000

X

- Definition

Committed credit facilities, amount.

+ References

No definition available.

+ Details

Name:	eric_CommittedCreditFacilitiesAmount
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Committed credit facilities, unutilized.

+ References

No definition available.

+ Details

Name:	eric_CommittedCreditFacilitiesUnutilized
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Committed credit facilities, utilized.

+ References

No definition available.

+ Details

Name:	eric_CommittedCreditFacilitiesUtilized
Namespace Prefix:	eric_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Disclosure of line of credit facility table line items.

+ References

No definition available.

+ Details

Name:	eric_DisclosureOfLineOfCreditFacilityLineItems
Namespace Prefix:	eric_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=eric_MulticurrencyRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_BorrowingsByNameAxis=eric_LiquidityRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: