v3.24.1.1.u2
Borrowings - Narrative (Details) - GBP (£)
£ in Millions
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Disclosure of fair value measurement of liabilities [line items]      
Borrowings £ 47,072 £ 42,985 £ 45,465
Collateral received 72 111  
Borrowings      
Disclosure of fair value measurement of liabilities [line items]      
Notional amount 46,141 42,353  
At fair value      
Disclosure of fair value measurement of liabilities [line items]      
Borrowings 42,617 38,219  
At fair value | Level 1      
Disclosure of fair value measurement of liabilities [line items]      
Borrowings 34,281 31,710  
At fair value | Level 2      
Disclosure of fair value measurement of liabilities [line items]      
Borrowings £ 8,336 £ 6,509