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Cover Page
 12 Months Ended
Dec. 31, 2022
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2022
Current Fiscal Year End Date --12-31
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-09531
Entity Registrant Name TELEFÓNICA, S.A.
Entity Incorporation, State or Country Code U3
Entity Address, Address Line One Distrito Telefónica
Entity Address, Address Line Two Ronda de la Comunicación
Entity Address, Address Line Three s/n
Entity Address, Postal Zip Code 28050
Entity Address, City or Town Madrid
Entity Address, Country ES
Entity Common Stock, Shares Outstanding 5,775,237,554
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Large Accelerated Filer
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Central Index Key 0000814052
Amendment Flag false
Document Fiscal Year Focus 2022
Document Fiscal Period Focus FY
Ordinary shares  
Document Information [Line Items]  
Title of 12(b) Security Ordinary Shares, nominal value 1.00 euro per share
Security Exchange Name NYSE
No Trading Symbol Flag true
American depositary shares  
Document Information [Line Items]  
Title of 12(b) Security American Depositary Shares, each representing oneOrdinary Share
Trading Symbol TEF
Security Exchange Name NYSE
Senior notes due 2027  
Document Information [Line Items]  
Title of 12(b) Security $1,500,000,000 Fixed Rate Senior Notes Due 2027
Trading Symbol TEF/27
Security Exchange Name NYSE
Guaranteed senior notes due 2036  
Document Information [Line Items]  
Title of 12(b) Security $2,000,000,000 Fixed Rate Guaranteed Senior Notes Due 2036
Trading Symbol TEF/36
Security Exchange Name NYSE
Senior notes due 2038  
Document Information [Line Items]  
Title of 12(b) Security $750,000,000 Fixed Rate Senior Notes Due 2038
Trading Symbol TEF/38
Security Exchange Name NYSE
Senior notes due 2047  
Document Information [Line Items]  
Title of 12(b) Security $2,500,000,000 Fixed Rate Senior Notes Due 2047
Trading Symbol TEF/47
Security Exchange Name NYSE
Senior notes due 2048  
Document Information [Line Items]  
Title of 12(b) Security $1,250,000,000 Fixed Rate Senior Notes Due 2048
Trading Symbol TEF/48
Security Exchange Name NYSE
Senior notes due 2049  
Document Information [Line Items]  
Title of 12(b) Security $1,250,000,000 Fixed Rate Senior Notes Due 2049
Trading Symbol TEF/49
Security Exchange Name NYSE
Guaranteed senior notes due 2030  
Document Information [Line Items]  
Title of 12(b) Security $1,250,000,000 Fixed Rate Guaranteed Senior Notes Due 2030
Trading Symbol TEF/30
Security Exchange Name NYSE
Business contact  
Document Information [Line Items]  
Entity Address, Address Line One Distrito Telefónica
Entity Address, Address Line Two Ronda de la Comunicación
Entity Address, Address Line Three s/n
Entity Address, Postal Zip Code 28050
Entity Address, City or Town Madrid
Entity Address, Country ES
City Area Code 91
Local Phone Number 482 3733
Contact Personnel Name Consuelo Barbé Capdevila
Contact Personnel Fax Number +34 91 482 3817
Contact Personnel Email Address amv@telefonica.com
Business contact 2  
Document Information [Line Items]  
Entity Address, Address Line One Distrito Telefónica
Entity Address, Address Line Two Ronda de la Comunicación
Entity Address, Address Line Three s/n
Entity Address, Postal Zip Code 28050
Entity Address, City or Town Madrid
Entity Address, Country ES
City Area Code 91
Local Phone Number 482 8700
Contact Personnel Name Adrián Zunzunegui Ruano
Contact Personnel Fax Number +34 91 482 8600
Contact Personnel Email Address ir@telefonica.com