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Issued share capital, share premium account and share options - Share capital (Details) - EUR (€)
€ / shares in Units, € in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2020
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disclosure of classes of share capital [line items]        
Cancellation of shares   0 47,200,000 37,800,000
Ordinary shares        
Disclosure of classes of share capital [line items]        
Number of shares issued 35,200,000 1,128,062,028 1,089,181,737 1,133,395,322
Par value per share € 11.35      
Net proceeds from shares issued € 400      
Transaction costs € 2      
New issue   3,600,000 3,000,000 0