v3.26.1
Taxation - Deferred tax assets and liabilities (Details) - EUR (€)
€ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Taxation      
Amount credited/(expensed) in income statement € (834) € (1,266)  
Gross deferred tax asset 36,978 37,383  
Gross deferred tax liability (5,733) (4,721)  
Less amounts unrecognised (14,220) (14,427)  
Deferred tax assets and liabilities      
Deferred tax assets 18,068 19,033  
Deferred tax liabilities (1,043) (798)  
Net deferred tax assets 17,025 18,235 € 19,478
Tangible assets      
Taxation      
Amount credited/(expensed) in income statement 20 (6)  
Gross deferred tax asset 3,574 2,831  
Gross deferred tax liability (1,419) (1,133)  
Less amounts unrecognised (408)    
Deferred tax assets and liabilities      
Net deferred tax assets 1,747 1,698  
Intangible assets      
Taxation      
Amount credited/(expensed) in income statement (655) 133  
Gross deferred tax asset 457 266  
Gross deferred tax liability (1,097) (1,036)  
Less amounts unrecognised   (3)  
Deferred tax assets and liabilities      
Net deferred tax assets (640) (773)  
Tax losses      
Taxation      
Amount credited/(expensed) in income statement (137) (1,256)  
Gross deferred tax asset 30,081 31,367  
Less amounts unrecognised (13,302) (13,843)  
Deferred tax assets and liabilities      
Net deferred tax assets 16,779 17,524  
Treasury related items      
Taxation      
Amount credited/(expensed) in income statement 27 (43)  
Gross deferred tax asset 525 583  
Gross deferred tax liability (575) (214)  
Less amounts unrecognised (510) (568)  
Deferred tax assets and liabilities      
Net deferred tax assets (560) (199)  
Temporary differences relating to revenue recognition      
Taxation      
Amount credited/(expensed) in income statement 116 (28)  
Gross deferred tax asset 74 83  
Gross deferred tax liability (664) (789)  
Deferred tax assets and liabilities      
Net deferred tax assets (590) (706)  
Temporary differences relating to leases      
Taxation      
Amount credited/(expensed) in income statement 10 (28)  
Gross deferred tax asset 1,678 1,537  
Gross deferred tax liability (1,473) (1,340)  
Deferred tax assets and liabilities      
Net deferred tax assets 205 197  
Other temporary differences      
Taxation      
Amount credited/(expensed) in income statement (215) (38)  
Gross deferred tax asset 589 716  
Gross deferred tax liability (505) (209)  
Less amounts unrecognised 0 (13)  
Deferred tax assets and liabilities      
Net deferred tax assets € 84 € 494