v3.26.1
Intangible assets (Details) - EUR (€)
€ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period € 33,438  
Balance at the end of the period 36,277 € 33,438
Deferred Payments For Licence And Spectrum Additions 771 0
TÜRKIYE    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period 824 366
Balance at the end of the period   824
Significant licences | GERMANY    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period 2,290 2,392
Balance at the end of the period   2,290
Significant licences | UK    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period 1,622 965
Balance at the end of the period   1,622
Significant licences | Vodacom    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period 932 771
Balance at the end of the period   932
Goodwill [member]    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period 20,514  
Balance at the end of the period 21,918 20,514
Licence and spectrum fees    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period 5,227  
Balance at the end of the period 6,364 5,227
Assets in the course of construction € 18 151
Licence and spectrum fees | Bottom of range [member]    
Intangible assets    
Estimated useful lives of finite lived intangible assets (in years) 3 years  
Licence and spectrum fees | Maximum [Member]    
Intangible assets    
Estimated useful lives of finite lived intangible assets (in years) 40 years  
Software    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period € 5,299  
Balance at the end of the period 5,534 5,299
Assets in the course of construction € 824 1,035
Software | Bottom of range [member]    
Intangible assets    
Estimated useful lives of finite lived intangible assets (in years) 3 years  
Software | Maximum [Member]    
Intangible assets    
Estimated useful lives of finite lived intangible assets (in years) 10 years  
Brands | Bottom of range [member]    
Intangible assets    
Estimated useful lives of finite lived intangible assets (in years) 1 year  
Brands | Maximum [Member]    
Intangible assets    
Estimated useful lives of finite lived intangible assets (in years) 30 years  
Customer bases    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period € 2,382  
Balance at the end of the period € 2,235 2,382
Customer bases | Bottom of range [member]    
Intangible assets    
Estimated useful lives of finite lived intangible assets (in years) 2 years  
Customer bases | Maximum [Member]    
Intangible assets    
Estimated useful lives of finite lived intangible assets (in years) 37 years  
Others    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period € 16  
Balance at the end of the period 226 16
Cost    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period 134,669 131,784
Exchange movements (1,825) (254)
Acquisition of subsidiaries 4,135 11
Additions 3,234 2,655
Disposals (1,250) (871)
Hyperinflation impacts 1,284 1,389
Other (97) (45)
Balance at the end of the period 140,150 134,669
Cost | Goodwill [member]    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period 77,716 77,252
Exchange movements (571) (252)
Acquisition of subsidiaries 1,465 7
Hyperinflation impacts 627 709
Balance at the end of the period 79,237 77,716
Cost | Licence and spectrum fees    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period 27,793 27,292
Exchange movements (734) 62
Acquisition of subsidiaries 1,001  
Additions 1,083 236
Disposals (305) (98)
Hyperinflation impacts 293 301
Balance at the end of the period 29,131 27,793
Cost | Software    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period 19,259 17,434
Exchange movements (424) (63)
Acquisition of subsidiaries 897  
Additions 2,142 2,414
Disposals (942) (772)
Hyperinflation impacts 285 291
Other (97) (45)
Balance at the end of the period 21,120 19,259
Cost | Customer bases    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period 9,390 9,320
Exchange movements (56) 17
Acquisition of subsidiaries 541 4
Additions 1  
Hyperinflation impacts 44 49
Balance at the end of the period 9,920 9,390
Cost | Others    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period 511 486
Exchange movements (40) (18)
Acquisition of subsidiaries 231  
Additions 8 5
Disposals (3) (1)
Hyperinflation impacts 35 39
Balance at the end of the period 742 511
Accumulated depreciation, amortisation and impairment [member]    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period (101,231) (92,932)
Exchange movements (1,395) (268)
Disposals 1,129 866
Hyperinflation impacts 1,128 1,223
Other 52  
Impairments   4,515
Charge for the year 4,090 3,695
Balance at the end of the period (103,873) (101,231)
Accumulated depreciation, amortisation and impairment [member] | Goodwill [member]    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period (57,202) (52,296)
Exchange movements 510 318
Hyperinflation impacts (627) (709)
Impairments   4,515
Balance at the end of the period (57,319) (57,202)
Accumulated depreciation, amortisation and impairment [member] | Licence and spectrum fees    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period (22,566) (21,731)
Exchange movements 504 (106)
Disposals 197 98
Hyperinflation impacts (180) (176)
Charge for the year 722 651
Balance at the end of the period (22,767) (22,566)
Accumulated depreciation, amortisation and impairment [member] | Software    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period (13,960) (12,104)
Exchange movements 314 58
Disposals 932 767
Hyperinflation impacts (242) (250)
Other 52  
Charge for the year 2,682 2,431
Balance at the end of the period (15,586) (13,960)
Accumulated depreciation, amortisation and impairment [member] | Customer bases    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period (7,008) (6,338)
Exchange movements 41 (16)
Hyperinflation impacts (44) (49)
Charge for the year 674 605
Balance at the end of the period (7,685) (7,008)
Accumulated depreciation, amortisation and impairment [member] | Others    
Changes in Intangible Assets and Goodwill    
Balance at the beginning of the period (495) (463)
Exchange movements (26) (14)
Disposals 0 1
Hyperinflation impacts 35 39
Charge for the year 12 8
Balance at the end of the period € (516) € (495)