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Tax Matters - Tax Credits for Loss Carry-Forwards (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance, deferred tax assets € 4,884 € 5,616
Ending balance, deferred tax assets 6,240 4,884
Tax loss carryforwards generated in the tax group 4,628  
Tax credits for loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance, deferred tax assets 2,011 2,639
Additions 1,047 278
Reversals (311) (939)
Perimeter changes 0 1
Translation differences and other 56 32
Ending balance, deferred tax assets 2,803 2,011
Tax loss carryforwards generated in the tax group 2,633  
Spain    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance, deferred tax assets 457  
Ending balance, deferred tax assets 1,110 457
Tax loss carryforwards generated in the tax group 77 498
Spain | Tax credits for loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance, deferred tax assets 457 999
Additions 725 58
Reversals (75) (600)
Perimeter changes 0 0
Translation differences and other 3 0
Ending balance, deferred tax assets 1,110 457
Germany    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Ending balance, deferred tax assets 879  
Tax loss carryforwards generated in the tax group 5,295 5,452
Germany | Tax credits for loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance, deferred tax assets 810 778
Additions 189 153
Reversals (120) (122)
Perimeter changes 0 1
Translation differences and other 0 0
Ending balance, deferred tax assets 879 810
Latin America    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Ending balance, deferred tax assets 814  
Tax loss carryforwards generated in the tax group 841 683
Latin America | Tax credits for loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance, deferred tax assets 741 861
Additions 133 64
Reversals (113) (216)
Perimeter changes 0 0
Translation differences and other 53 32
Ending balance, deferred tax assets 814 741
Other | Tax credits for loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance, deferred tax assets 3 1
Additions 0 3
Reversals (3) (1)
Perimeter changes 0 0
Translation differences and other 0 0
Ending balance, deferred tax assets 0 € 3
Telefónica Spain | Tax credits for loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax loss carryforwards generated in the tax group 1,995  
Less than 1 year | Tax credits for loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax loss carryforwards generated in the tax group 0  
Less than 1 year | Telefónica Spain | Tax credits for loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax loss carryforwards generated in the tax group 0  
More than 1 year | Tax credits for loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax loss carryforwards generated in the tax group 2,633  
More than 1 year | Telefónica Spain | Tax credits for loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Tax loss carryforwards generated in the tax group € 1,995