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Equity - Other Equity Instruments (Details)
€ / shares in Units, € in Millions, $ in Millions
12 Months Ended
Jun. 07, 2023
Sep. 25, 2017
€ / shares
shares
Sep. 24, 2014
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
Jun. 07, 2043
Jun. 07, 2028
Dec. 31, 2017
USD ($)
Dec. 07, 2017
EUR (€)
Sep. 20, 2017
shares
Dec. 07, 2016
shares
Nov. 11, 2016
shares
Nov. 13, 2015
shares
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities       € 47,375                    
Swap rate term 5 years 6 months                          
Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities       32,903                    
Retained earnings                            
Disclosure of detailed information about borrowings [line items]                            
Payments on undated deeply subordinated securities       (263) € (255) € (247)                
Notes mandatorily convertible into shares                            
Disclosure of detailed information about borrowings [line items]                            
Issuance of convertible notes     € 1,500                      
Notes mandatorily convertible into shares | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Convertible notes, interest rate     4.90%                      
Option to convert treasury shares into fix ratio                            
Disclosure of detailed information about borrowings [line items]                            
Payments of coupons       74 74                  
Term debt | Gross carrying amount                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities       7,518 6,518 5,518                
Exercisable from issuer in 2023 | Gross carrying amount                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities       € 1,000 0 0       € 1,000        
Exercisable from issuer in 2023 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual Fix       2.625%         2.625%          
Exercisable from issuer in 2023 | Fixed interest rate | Telefónica Europe, B.V.                            
Disclosure of detailed information about borrowings [line items]                            
Annual Fix 2.327%           3.327% 2.577%   2.625%        
Exercisable from issuer in 2022 | Gross carrying amount                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities       € 1,000 1,000 0                
Exercisable from issuer in 2022 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual Fix       3.75%         3.75%          
Exercisable From Issuer In 2020, Issued 09/15/16 | Gross carrying amount                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities       € 452 452 452                
Exercisable From Issuer In 2020, Issued 09/15/16 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual Fix       8.50%         8.50%          
Exercisable From Issuer In 2019 | Gross carrying amount                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities       € 850 850 850                
Exercisable From Issuer In 2019 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual Fix       4.20%         4.20%          
Exercisable From Issuer In 2020, Issued 03/25/14 | Gross carrying amount                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities       € 750 750 750                
Exercisable From Issuer In 2020, Issued 03/25/14 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual Fix       5.00%         5.00%          
Exercisable From Issuer In 2024 | Gross carrying amount                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities       € 1,000 1,000 1,000                
Exercisable From Issuer In 2024 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual Fix       5.875%         5.875%          
Exercisable From Issuer In 2020, Issued 11/26/13 | Gross carrying amount                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities       € 716 716 716                
Exercisable From Issuer In 2020, Issued 11/26/13 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual Fix       6.75%         6.75%          
Exercisable From Issuer In 2018 | Gross carrying amount                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities       € 1,125 1,125 1,125                
Exercisable From Issuer In 2018 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual Fix       6.50%         6.50%          
Exercisable From Issuer In 2021 | Gross carrying amount                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities       € 625 € 625 € 625                
Exercisable From Issuer In 2021 | Fixed interest rate                            
Disclosure of detailed information about borrowings [line items]                            
Annual Fix       7.625%         7.625%          
Issued by separate lender | Gross carrying amount | Colombia Telecomunicaciones, S.A., ESP                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities | $                 $ 500          
Convertible notes converted into debt                            
Disclosure of detailed information about borrowings [line items]                            
Carrying value of deeply subordinated securities     € 215                      
Ordinary shares                            
Disclosure of detailed information about borrowings [line items]                            
Number of shares issued | shares   154,341,669                 154,326,696 137,233,781 137,233,781 110,857,946
Convertible notes conversion price (EUR per share) | € / shares   € 9.7174                        
Treasury shares                            
Disclosure of detailed information about borrowings [line items]                            
Number of shares issued | shares                     14,973