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Investments in associates and joint ventures - Summary of Investments (Details) - EUR (€)
€ in Millions
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2019
Investment in associates and joint arrangements        
Investment in joint ventures € 3,781 € 4,249    
Investment in associates 487 421    
Total investment in joint ventures and associates 4,268 4,670    
Joint ventures [member]        
Investment in associates and joint arrangements        
Investment in joint ventures 3,781 4,249    
VodafoneZiggo Group Holding B.V.        
Investment in associates and joint arrangements        
Investment in joint ventures 822 1,190    
INWIT S.p.A.        
Investment in associates and joint arrangements        
Investment in joint ventures 2,851 2,920    
Indus Towers Limited        
Investment in associates and joint arrangements        
Investment in joint ventures 1,000      
Vodafone Idea Limited        
Investment in associates and joint arrangements        
Investment in joint ventures     € 0 € 0
Other joint ventures        
Investment in associates and joint arrangements        
Investment in joint ventures € 24 € 35