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Investments in associates and joint ventures (Details)
€ in Millions, $ in Millions, ₨ in Billions
12 Months Ended
Nov. 25, 2020
Sep. 30, 2019
EUR (€)
Mar. 31, 2021
EUR (€)
Mar. 31, 2020
EUR (€)
Mar. 31, 2019
EUR (€)
Mar. 31, 2021
INR (₨)
Mar. 31, 2021
AUD ($)
Mar. 31, 2021
EUR (€)
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
EUR (€)
Investment in associates and joint arrangements                    
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method     € 488 € 246 € 216          
(Loss)/profit from continuing operations     € (146) € (2,751) (1,124)          
Indus Towers Limited                    
Investment in associates and joint arrangements                    
Ownership interest in joint venture     28.10%              
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method     € 274              
Joint ventures [member]                    
Investment in associates and joint arrangements                    
Percentage of stake owned     100.00%              
TPG Telecom                    
Investment in associates and joint arrangements                    
Ownership interest in joint venture     25.10% 50.00%            
Fair value of investments based on quoted share price             $ 2,948 € 1,911    
INWIT S.p.A.                    
Investment in associates and joint arrangements                    
Ownership interest in joint venture     33.20% 37.50%            
Fair value of investments based on quoted share price               3,026   € 3,345
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method     € 3              
(Loss)/profit from continuing operations     3              
Investment proportion not recognised               0    
Indus Towers Limited                    
Investment in associates and joint arrangements                    
Ownership interest in joint venture 42.00%                  
Impairment loss     1,300              
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method     306 € 19 75          
(Loss)/profit from continuing operations     € 274 € 19 55          
Investment proportion not recognised               48    
Vodafone Idea Limited                    
Investment in associates and joint arrangements                    
Ownership interest in joint venture     44.40% 44.40%            
Fair value of investments based on quoted share price           ₨ 118   1,373 ₨ 40 476
Carrying value up to which losses has restricted   € 0                
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method     € (1,045) € (4,386) (903)          
(Loss)/profit from continuing operations     0 (2,546) (903)          
Investment proportion not recognised               € 2,743   € 1,804
Other                    
Investment in associates and joint arrangements                    
(Loss)/profit from continuing operations     € (15) € (125) € (14)          
Cornerstone Telecommunications Infrastructure Limited                    
Investment in associates and joint arrangements                    
Percentage of stake owned     50.00% 50.00%            
TPG Telecom                    
Investment in associates and joint arrangements                    
Gain in relation to the merger     € 1,043              
Remaining economic interest (as a percent)     49.90%              
TPG Telecom | Vodafone Hutchison Australia Pty Limited                    
Investment in associates and joint arrangements                    
Ownership interest in joint venture     25.05%