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Goodwill - Sensitivity to Changes in Assumptions (Details)
Dec. 31, 2022
Dec. 31, 2021
Perpetuity growth rates | Telefónica Peru    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent) (0.25%)  
OIBDA Margin | Telefónica Peru    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent) (1.00%)  
Telefónica Spain | Discount rate | Minimum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   (0.50%)
Telefónica Spain | Discount rate | Maximum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   0.50%
Telefónica Spain | Perpetuity growth rates | Minimum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   (0.25%)
Telefónica Spain | Perpetuity growth rates | Maximum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   0.25%
Telefónica Spain | OIBDA Margin | Minimum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   (1.50%)
Telefónica Spain | OIBDA Margin | Maximum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   1.50%
Telefónica Spain | Ratio of CapEx/Revenues | Minimum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   (0.75%)
Telefónica Spain | Ratio of CapEx/Revenues | Maximum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   0.75%
Telefónica Germany | Discount rate | Minimum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   (0.50%)
Telefónica Germany | Discount rate | Maximum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   0.50%
Telefónica Germany | Perpetuity growth rates | Minimum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   (0.25%)
Telefónica Germany | Perpetuity growth rates | Maximum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   0.25%
Telefónica Germany | OIBDA Margin | Minimum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   (1.50%)
Telefónica Germany | OIBDA Margin | Maximum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   1.50%
Telefónica Germany | Ratio of CapEx/Revenues | Minimum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   (0.75%)
Telefónica Germany | Ratio of CapEx/Revenues | Maximum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   0.75%
Telefónica Brazil | Discount rate | Minimum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   (1.00%)
Telefónica Brazil | Discount rate | Maximum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   1.00%
Telefónica Brazil | Perpetuity growth rates | Minimum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   (0.50%)
Telefónica Brazil | Perpetuity growth rates | Maximum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   0.50%
Telefónica Brazil | OIBDA Margin | Minimum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   (2.00%)
Telefónica Brazil | OIBDA Margin | Maximum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   2.00%
Telefónica Brazil | Ratio of CapEx/Revenues | Minimum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   (1.00%)
Telefónica Brazil | Ratio of CapEx/Revenues | Maximum    
Disclosure of detailed information about intangible assets [line items]    
Change in key assumption rate (as a percent)   1.00%