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Goodwill - Sensitivity to Changes in Assumptions (Details)
Dec. 31, 2023
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 | Long-term margin of operating results before depreciation and amortization | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Change in key assumption rate (as a percent) (1.75%)
Telefónica Spain | Long-term margin of operating results before depreciation and amortization | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Change in key assumption rate (as a percent) 1.75%
Telefónica Spain | Ratio of CapEx/Revenues | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Change in key assumption rate (as a percent) (0.875%)
Telefónica Spain | Ratio of CapEx/Revenues | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Change in key assumption rate (as a percent) 0.875%
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 | Long-term margin of operating results before depreciation and amortization | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Change in key assumption rate (as a percent) (1.50%)
Telefónica Germany | Long-term margin of operating results before depreciation and amortization | 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 | Long-term margin of operating results before depreciation and amortization | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Change in key assumption rate (as a percent) (2.00%)
Telefónica Brazil | Long-term margin of operating results before depreciation and amortization | 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%