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Goodwill - Perpetuity Growth Rate Applied to Cash Flow Projections (Details)
Dec. 31, 2022
Dec. 31, 2021
Telefónica Spain    
Disclosure of detailed information about intangible assets [line items]    
Growth rate applied to cash flow projections (as a percent) 0.80% 0.80%
Telefónica Brazil    
Disclosure of detailed information about intangible assets [line items]    
Growth rate applied to cash flow projections (as a percent) 4.50% 4.50%
Telefónica Germany    
Disclosure of detailed information about intangible assets [line items]    
Growth rate applied to cash flow projections (as a percent) 1.00% 1.10%