v3.24.1.1.u2
Assets held for sale and discontinued operations - Schedule of assets and liabilities classified as held for sale (Details) - GBP (£)
£ in Millions
Mar. 31, 2024
Mar. 31, 2023
Disclosure Of Detailed Information About Assets Held For Sale [Line Items]    
Total assets held for sale £ 1,823 £ 1,443
Total liabilities held for sale (1,474) (109)
Assets and liabilities classified as held for sale    
Disclosure Of Detailed Information About Assets Held For Sale [Line Items]    
Total assets held for sale 1,823 1,443
Total liabilities held for sale (1,474) (109)
Net assets held for sale 349 1,334
Assets and liabilities classified as held for sale | UK Electricity System Operator    
Disclosure Of Detailed Information About Assets Held For Sale [Line Items]    
Total assets held for sale 1,134 0
Total liabilities held for sale (1,427) 0
Net assets held for sale (293) 0
Assets and liabilities classified as held for sale | FAA option    
Disclosure Of Detailed Information About Assets Held For Sale [Line Items]    
Total assets held for sale 0 0
Total liabilities held for sale 0 (109)
Net assets held for sale 0 (109)
Assets and liabilities classified as held for sale | RAA option    
Disclosure Of Detailed Information About Assets Held For Sale [Line Items]    
Total assets held for sale 0 0
Total liabilities held for sale (47) 0
Net assets held for sale (47) 0
Assets and liabilities classified as held for sale | GasT TopCo Limited    
Disclosure Of Detailed Information About Assets Held For Sale [Line Items]    
Total assets held for sale 689 1,443
Total liabilities held for sale 0 0
Net assets held for sale £ 689 £ 1,443