v3.25.1
Property, plant and equipment - Accumulated depreciation and impairment (Details) - EUR (€)
€ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reconciliation of property, plant and equipment    
Property, plant and equipment at beginning of the period € 19,399  
Property, plant and equipment at end of the period 20,402 € 19,399
Land and buildings    
Reconciliation of property, plant and equipment    
Property, plant and equipment at beginning of the period 568  
Property, plant and equipment at end of the period € 560 568
Freehold buildings | Bottom of range [member]    
Property, plant and equipment    
Useful lives, property, plant and equipment 25 years  
Freehold buildings | Maximum [Member]    
Property, plant and equipment    
Useful lives, property, plant and equipment 50 years  
Equipment, fixtures and fittings    
Reconciliation of property, plant and equipment    
Property, plant and equipment at beginning of the period € 18,831  
Property, plant and equipment at end of the period 19,842 18,831
Equipment, fixtures and fittings | Property, plant and equipment subject to operating leases    
Reconciliation of property, plant and equipment    
Assets in the course of construction € 520 583
Network infrastructure and other | Bottom of range [member]    
Property, plant and equipment    
Useful lives, property, plant and equipment 1 year  
Network infrastructure and other | Maximum [Member]    
Property, plant and equipment    
Useful lives, property, plant and equipment 35 years  
Discontinued Operations    
Reconciliation of property, plant and equipment    
Charge for the year € 0 988
Cost    
Reconciliation of property, plant and equipment    
Property, plant and equipment at beginning of the period 59,758 76,457
Exchange movements (376) (1,909)
Additions 4,474 4,787
Disposals (917) (2,085)
Transfer to assets held for sale   (18,969)
Hyperinflation impacts 1,177 1,385
Other 266 92
Property, plant and equipment at end of the period 64,382 59,758
Cost | Land and buildings    
Reconciliation of property, plant and equipment    
Property, plant and equipment at beginning of the period 1,557 1,997
Exchange movements 5 (31)
Additions 27 34
Disposals (13) (15)
Transfer to assets held for sale   (439)
Hyperinflation impacts 5 9
Other (16) 2
Property, plant and equipment at end of the period 1,565 1,557
Assets in the course of construction 15 4
Cost | Equipment, fixtures and fittings    
Reconciliation of property, plant and equipment    
Property, plant and equipment at beginning of the period 58,201 74,460
Exchange movements (381) (1,878)
Additions 4,447 4,753
Disposals (904) (2,070)
Transfer to assets held for sale   (18,530)
Hyperinflation impacts 1,172 1,376
Other 282 90
Property, plant and equipment at end of the period 62,817 58,201
Assets in the course of construction 1,355 1,401
Cost | Equipment, fixtures and fittings | Property, plant and equipment subject to operating leases    
Reconciliation of property, plant and equipment    
Assets in the course of construction 1,653 1,623
Accumulated depreciation, amortisation and impairment [member]    
Reconciliation of property, plant and equipment    
Property, plant and equipment at beginning of the period (40,359) (50,563)
Exchange movements 304 1,265
Charge for the year 3,874 4,870
Disposals 881 2,054
Transfer to assets held for sale   12,794
Hyperinflation impacts (851) (1,039)
Other 81  
Property, plant and equipment at end of the period (43,980) (40,359)
Accumulated depreciation, amortisation and impairment [member] | Land and buildings    
Reconciliation of property, plant and equipment    
Property, plant and equipment at beginning of the period (989) (1,240)
Exchange movements (4) 7
Charge for the year 36 56
Disposals 14 15
Transfer to assets held for sale   287
Hyperinflation impacts (2) (2)
Other (12)  
Property, plant and equipment at end of the period (1,005) (989)
Accumulated depreciation, amortisation and impairment [member] | Equipment, fixtures and fittings    
Reconciliation of property, plant and equipment    
Property, plant and equipment at beginning of the period (39,370) (49,323)
Exchange movements 308 1,258
Charge for the year 3,838 4,814
Disposals 867 2,039
Transfer to assets held for sale   12,507
Hyperinflation impacts (849) (1,037)
Other 93  
Property, plant and equipment at end of the period (42,975) (39,370)
Accumulated depreciation, amortisation and impairment [member] | Equipment, fixtures and fittings | Property, plant and equipment subject to operating leases    
Reconciliation of property, plant and equipment    
Assets in the course of construction € 1,133 € 1,040