v3.24.1.1.u2
Derivative financial instruments - Schedule of maturity profile of financing derivatives (Details) - GBP (£)
£ in Millions
Mar. 31, 2024
Mar. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Derivative assets £ 368 £ 429
Derivative liabilities (1,244) (1,293)
Total (876) (864)
Financing derivatives    
Disclosure of detailed information about financial instruments [line items]    
Derivative assets 333 363
Derivative liabilities (1,126) (1,119)
Total (793) (756)
Financing derivatives | Less than 1 year    
Disclosure of detailed information about financial instruments [line items]    
Derivative assets 18 100
Derivative liabilities (249) (93)
Total (231) 7
Financing derivatives | Over 12 months past due    
Disclosure of detailed information about financial instruments [line items]    
Derivative assets 315 263
Derivative liabilities (877) (1,026)
Total (562) (763)
Financing derivatives | In 1 to 2 years    
Disclosure of detailed information about financial instruments [line items]    
Derivative assets 6 13
Derivative liabilities (80) (100)
Total (74) (87)
Financing derivatives | In 2 to 3 years    
Disclosure of detailed information about financial instruments [line items]    
Derivative assets 31 15
Derivative liabilities (44) (96)
Total (13) (81)
Financing derivatives | In 3 to 4 years    
Disclosure of detailed information about financial instruments [line items]    
Derivative assets 32 32
Derivative liabilities (74) (11)
Total (42) 21
Financing derivatives | In 4 to 5 years    
Disclosure of detailed information about financial instruments [line items]    
Derivative assets 49 14
Derivative liabilities (83) (107)
Total (34) (93)
Financing derivatives | More than 5 years    
Disclosure of detailed information about financial instruments [line items]    
Derivative assets 197 189
Derivative liabilities (596) (712)
Total £ (399) £ (523)