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Share capital - Schedule of share capital (Details) - GBP (£)
£ in Millions, shares in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Disclosure of classes of share capital [line items]      
Equity, beginning balance £ 29,562 £ 23,856 £ 19,860
Issued during the year in lieu of dividends [1] (1) 0 (1)
Equity, ending balance £ 29,892 £ 29,562 £ 23,856
Share capital      
Disclosure of classes of share capital [line items]      
Issued capital beginning balance (in shares) 3,930 3,904  
Issued during the year in lieu of dividends (in shares) 37 26  
Issued capital ending balance (in shares) 3,967 3,930 3,904
Equity, beginning balance £ 488 £ 485 £ 474
Issued during the year in lieu of dividends [1] 5 3 11
Equity, ending balance £ 493 £ 488 £ 485
[1] Included within the share premium account are costs associated with scrip dividends.