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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, 2022
EUR (€)
Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value € 622
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 € 594
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 € 653
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 € 622
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 € 659
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 € 592
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 € 354
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 341
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 367
Pension plans | Growth rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 354
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 354
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 354
Health plans | Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 268
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 253
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 286
Health plans | Growth rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Defined benefit obligation, at present value 268
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 305
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 € 238