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Provisions - Sensitivity to Changes in Actuarial Assumptions on Discounted Obligation of Telefónica Brazil Plan (Details)
€ in Millions
Dec. 31, 2024
EUR (€)
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage of possible increase in actuarial assumption 1.00%
Percentage of reasonably possible decrease in actuarial assumption 1.00%
Brazil | Foreign defined benefit plans | Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value € 545
Brazil | Foreign defined benefit plans | Discount rate | Present value of the obligation by increasing the discount rate by 0.5%  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value € 523
Percentage of possible increase in actuarial assumption 0.50%
Brazil | Foreign defined benefit plans | Discount rate | Present value of the obligation by reducing the discount rate by 0.5%  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value € 567
Percentage of reasonably possible decrease in actuarial assumption 0.50%
Brazil | Foreign defined benefit plans | Growth rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value € 545
Brazil | Foreign defined benefit plans | Growth rate | Present value of the obligation by increasing the rate by 1%  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value € 573
Percentage of possible increase in actuarial assumption 1.00%
Brazil | Foreign defined benefit plans | Growth rate | Present value of the obligation by reducing the rate by 1%  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value € 521
Percentage of reasonably possible decrease in actuarial assumption 1.00%
Brazil | Pension plans | Foreign defined benefit plans | Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value € 304
Brazil | Pension plans | Foreign defined benefit plans | Discount rate | Present value of the obligation by increasing the discount rate by 0.5%  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 295
Brazil | Pension plans | Foreign defined benefit plans | Discount rate | Present value of the obligation by reducing the discount rate by 0.5%  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 313
Brazil | Pension plans | Foreign defined benefit plans | Growth rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 304
Brazil | Pension plans | Foreign defined benefit plans | Growth rate | Present value of the obligation by increasing the rate by 1%  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 304
Brazil | Pension plans | Foreign defined benefit plans | Growth rate | Present value of the obligation by reducing the rate by 1%  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 304
Brazil | Health plans | Foreign defined benefit plans | Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 241
Brazil | Health plans | Foreign defined benefit plans | Discount rate | Present value of the obligation by increasing the discount rate by 0.5%  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 228
Brazil | Health plans | Foreign defined benefit plans | Discount rate | Present value of the obligation by reducing the discount rate by 0.5%  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 254
Brazil | Health plans | Foreign defined benefit plans | Growth rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 241
Brazil | Health plans | Foreign defined benefit plans | Growth rate | Present value of the obligation by increasing the rate by 1%  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 269
Brazil | Health plans | Foreign defined benefit plans | Growth rate | Present value of the obligation by reducing the rate by 1%  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value € 217