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Goodwill - After-Tax Discount Rates Applied to the Cash Flow Projections (Details)
Dec. 31, 2024
Dec. 31, 2023
Telefónica Spain    
Disclosure of detailed information about intangible assets [line items]    
Before-tax discount rates applied to cash flow projections (as a percent) 8.60% 9.10%
After-tax discount rates applied to cash flow projections (as a percent) 6.60% 7.00%
Telefónica Brazil    
Disclosure of detailed information about intangible assets [line items]    
Before-tax discount rates applied to cash flow projections (as a percent) 13.90% 14.80%
After-tax discount rates applied to cash flow projections (as a percent) 11.50% 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% 8.40%
After-tax discount rates applied to cash flow projections (as a percent) 5.50% 5.80%