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Cover Page
 12 Months Ended
Dec. 31, 2023
shares
Document Information [Line Items]  
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2023
Document Fiscal Year Focus 2023
Document Fiscal Period Focus FY
Trading Symbol ERIC
Entity Registrant Name ERICSSON LM TELEPHONE CO
Entity Central Index Key 0000717826
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Voluntary Filers No
Entity Interactive Data Current Yes
Entity Emerging Growth Company false
Entity Shell Company false
Security Exchange Name NASDAQ
Title of 12(b) Security American Depositary Shares (each representing one B share)
Entity File Number 000-12033
Entity Incorporation, State or Country Code V7
Entity Address, Address Line One Torshamnsgatan
Entity Address, Postal Zip Code 164 83
Entity Address, City or Town Stockholm
Entity Address, Country SE
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Registration Statement false
Document Accounting Standard International Financial Reporting Standards
ICFR Auditor Attestation Flag true
Auditor Name Deloitte AB
Auditor Firm ID 1126
Auditor Location Stockholm, Sweden
Document Financial Statement Error Correction [Flag] false
Business Contact [Member]  
Document Information [Line Items]  
Entity Address, Address Line One Torshamnsgatan
Entity Address, Postal Zip Code 164 83
Entity Address, City or Town Stockholm
Entity Address, Country SE
Contact Personnel Name Stefan Salentin
City Area Code 46
Local Phone Number 10 719 0000
Contact Personnel Email Address stefan.salentin@ericsson.com
A shares [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 261,755,983
B shares [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 3,082,395,752
C shares [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 0