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Tax Matters - Tax Credits for Loss Carry-Forwards (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance, deferred tax assets € 5,616 € 6,416
Ending balance, deferred tax assets 4,884 5,616
Tax loss carryforwards generated in the tax group 3,825  
Tax credits for loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance, deferred tax assets 2,639 2,741
Additions 278 435
Reversals (939) (508)
Perimeter changes 1 2
Translation differences and other 32 (31)
Ending balance, deferred tax assets 2,011 2,639
Tax loss carryforwards generated in the tax group 1,755  
Spain    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance, deferred tax assets 999  
Ending balance, deferred tax assets 457 999
Tax loss carryforwards generated in the tax group 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 999 1,283
Additions 58 0
Reversals (600) (283)
Perimeter changes 0 0
Translation differences and other 0 (1)
Ending balance, deferred tax assets 457 999
Germany    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Ending balance, deferred tax assets 810  
Tax loss carryforwards generated in the tax group 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 778 813
Additions 153 150
Reversals (122) (184)
Perimeter changes 1 0
Translation differences and other 0 (1)
Ending balance, deferred tax assets 810 778
Latin America    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Ending balance, deferred tax assets 741  
Tax loss carryforwards generated in the tax group 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 861 645
Additions 64 285
Reversals (216) (41)
Perimeter changes 0 0
Translation differences and other 32 (28)
Ending balance, deferred tax assets 741 861
Other | Tax credits for loss carryforwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Beginning balance, deferred tax assets 1 0
Additions 3 0
Reversals (1) 0
Perimeter changes 0 2
Translation differences and other 0 (1)
Ending balance, deferred tax assets 3 € 1
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 2,070  
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 143  
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 1,755  
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 € 1,927