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Goodwill - After-Tax Discount Rates Applied to the Cash Flow Projections (Details)
Dec. 31, 2022
Dec. 31, 2021
Telefónica Spain    
Disclosure of detailed information about intangible assets [line items]    
Before-tax discount rates applied to cash flow projections (as a percent) 9.00% 8.50%
After-tax discount rates applied to cash flow projections (as a percent) 6.90% 6.50%
Telefónica Brazil    
Disclosure of detailed information about intangible assets [line items]    
Before-tax discount rates applied to cash flow projections (as a percent) 16.40% 15.20%
After-tax discount rates applied to cash flow projections (as a percent) 12.60% 12.00%
Telefónica Germany    
Disclosure of detailed information about intangible assets [line items]    
Before-tax discount rates applied to cash flow projections (as a percent) 8.00% 7.20%
After-tax discount rates applied to cash flow projections (as a percent) 5.70% 5.20%