v3.26.1
Assets held for sale and discontinued operations - Schedule of assets and liabilities classified as held for sale, NGR & Grain LNG (Details)
£ in Millions, $ in Millions
12 Months Ended
Nov. 28, 2025
GBP (£)
May 29, 2025
GBP (£)
May 29, 2025
USD ($)
Mar. 31, 2026
GBP (£)
Mar. 31, 2025
GBP (£)
Mar. 31, 2024
GBP (£)
Mar. 31, 2023
GBP (£)
Disclosure Of Detailed Information About Assets Held For Sale [Line Items]              
Goodwill       £ 9,417 £ 9,532 £ 9,729  
Other intangible assets       3,879 3,564    
Property, plant and equipment       81,520 74,091    
Cash and cash equivalents       375 1,178 559 £ 163
Financial investments       3,587 6,429    
Total assets       108,281 106,742    
Borrowings       (46,755) (47,539) (47,072)  
Total liabilities       (68,951) (68,916)    
Net assets       39,330 37,826    
Reclassification of foreign currency translation reserve       (76) £ 0 £ 0  
National Grid Renewables              
Disclosure Of Detailed Information About Assets Held For Sale [Line Items]              
Reclassification of foreign currency translation reserve       £ (84)      
Assets and liabilities classified as held for sale | National Grid Renewables              
Disclosure Of Detailed Information About Assets Held For Sale [Line Items]              
Goodwill   £ 51          
Property, plant and equipment   438          
Investment in joint venture   906          
Trade and other receivables   141          
Cash and cash equivalents   58          
Financial investments   41          
Other assets   66          
Total assets   1,701          
Borrowings   (2)          
Other liabilities   (159)          
Total liabilities   (161)          
Net assets   1,540          
Proceeds   1,531          
Total consideration   1,531 $ 2,061        
Disposal-related costs   (11)          
Loss on disposal before tax and reclassification of foreign currency translation reserve   (20)          
Reclassification of foreign currency translation reserve   (76)          
Tax   5          
Post-tax loss on disposal   (91)          
Reclassification adjustments on retranslation of operations, before tax   84          
Reclassification adjustments on hedging instruments, before tax   £ 8          
Assets and liabilities classified as held for sale | Grain LNG              
Disclosure Of Detailed Information About Assets Held For Sale [Line Items]              
Other intangible assets £ 27            
Property, plant and equipment 962            
Trade and other receivables 27            
Cash and cash equivalents 163            
Other assets 20            
Total assets 1,199            
Borrowings (135)            
Other liabilities (196)            
Total liabilities (331)            
Net assets 868            
Proceeds 1,375            
Total consideration 1,375            
Disposal-related costs (18)            
Post-tax loss on disposal £ 489