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Provisions - Sensitivity to Changes in Actuarial Assumptions on Discounted Obligation of Telefónica Brazil Plan (Details) - Brazil - Foreign defined benefit plans
€ in Millions
Dec. 31, 2023
EUR (€)
Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value € 763
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 € 728
Percentage of possible increase in actuarial assumption 0.50%
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 € 803
Percentage of reasonably possible decrease in actuarial assumption 0.50%
Growth rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value € 763
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 € 814
Percentage of possible increase in actuarial assumption 1.00%
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 € 722
Percentage of reasonably possible decrease in actuarial assumption 1.00%
Pension plans | Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value € 405
Pension 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 391
Pension 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 420
Pension plans | Growth rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 405
Pension 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 405
Pension 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 405
Health plans | Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 358
Health 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 337
Health 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 383
Health plans | Growth rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 358
Health 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 409
Health 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 € 317