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Share-based payments - Share options and Share plans (Details)
£ / shares in Units, £ in Millions, Option in Millions
12 Months Ended
Mar. 31, 2023
GBP (£)
Option
£ / shares
Mar. 31, 2022
Option
£ / shares
Mar. 31, 2021
Option
£ / shares
Movements in outstanding ordinary share options      
Balance at the beginning of the period (in shares) | Option 61 62 53
Granted (in shares) | Option 50 20 35
Forfeited (in shares) | Option (2) (2) (1)
Exercised (in shares) | Option (8) (1)  
Expired (in shares) | Option (39) (18) (25)
Balance at the end of the period (in shares) | Option 62 61 62
Weighted average exercise price:      
Weighted average exercise price at the beginning of the period £ 1.02 £ 1.07 £ 1.19
Granted (per share) 0.83 0.95 1.03
Forfeited (per share) 1.02 1.06 1.16
Exercised (per share) 1.05 1.17 1.23
Expired (per share) 1.01 1.10 1.27
Weighted average exercise price at the end of the period 0.87 £ 1.02 £ 1.07
Maximum      
Weighted average exercise price:      
Weighted average exercise price at the end of the period 1.78    
Minimum      
Weighted average exercise price:      
Weighted average exercise price at the end of the period £ 0.78    
Vodafone Group executive plans      
Share options and Share plans      
Performance targets measurement period for share awards 3 years    
Vodafone Sharesave Plan      
Share options and Share plans      
Monthly savings, amount | £ £ 375    
Discount rate for share options 20    
Vodafone Sharesave Plan | Maximum      
Share options and Share plans      
Share option vesting period 5 years    
Vodafone Sharesave Plan | Minimum      
Share options and Share plans      
Share option vesting period 3 years