v3.26.1
Intangible assets - Summary of intangible assets and goodwill (Detail) - TRY (₺)
₺ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year ₺ 107,164,641 ₺ 110,575,271
Additions net of amortization (3,081,873) (4,530,309)
Disposals (99,559) (93,324)
Transfers 9,669 (46,977)
Impairment (expenses)/reversals (559,031) (155,693)
Effects of movements in exchange rates 1,546,058 1,415,673
Balance at end of year 104,979,905 107,164,641
Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 432,480,101 406,710,914
Additions 27,808,416 24,365,852
Disposals (225,331) (130,638)
Transfers 9,669 (46,977)
Effects of movements in exchange rates 2,756,802 1,580,950
Balance at end of year 462,829,657 432,480,101
Cost | Telecommunication licenses    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 129,024,942 129,086,912
Additions 239,593 1,343
Disposals (32) (82,130)
Effects of movements in exchange rates (43,206) 18,817
Balance at end of year 129,221,297 129,024,942
Cost | Computer software    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 211,255,967 195,942,049
Additions 15,961,770 13,811,239
Disposals (214,970) (43,107)
Transfers 561,008 382,537
Effects of movements in exchange rates 2,051,117 1,163,249
Balance at end of year 229,614,892 211,255,967
Cost | Transmission line software    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 2,013,857 1,990,425
Additions 3,132 1,465
Disposals   (662)
Effects of movements in exchange rates 12,033 22,629
Balance at end of year 2,029,022 2,013,857
Cost | Indefeasible right of usage    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 2,064,237 1,919,358
Additions 10,284 144,879
Effects of movements in exchange rates 1  
Balance at end of year 2,074,522 2,064,237
Cost | Brand name    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 15,897 20,350
Effects of movements in exchange rates 738 (4,453)
Balance at end of year 16,635 15,897
Cost | Customer base    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 65,029 73,883
Effects of movements in exchange rates (4,709) (8,854)
Balance at end of year 60,320 65,029
Cost | Goodwill    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 770,907 770,907
Balance at end of year 770,907 770,907
Cost | Subscriber acquisition cost    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 82,886,223 72,791,783
Additions 10,740,077 9,653,267
Effects of movements in exchange rates 756,434 441,173
Balance at end of year 94,382,734 82,886,223
Cost | Electricity production license    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 1,140,206 1,262,381
Transfers 1,140,203  
Effects of movements in exchange rates (269,104) (122,175)
Balance at end of year 2,011,305 1,140,206
Cost | Others    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 2,766,364 2,357,311
Additions 401,502 369,171
Disposals (10,329) (2,603)
Transfers (1,140,203) (46,977)
Effects of movements in exchange rates 251,711 89,462
Balance at end of year 2,269,045 2,766,364
Cost | Construction in progress    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year 476,472 495,555
Additions 452,058 384,488
Disposals   (2,136)
Transfers (551,339) (382,537)
Effects of movements in exchange rates 1,787 (18,898)
Balance at end of year 378,978 476,472
Accumulated depreciation, amortization and impairment    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year (325,315,460) (296,135,643)
Additions - amortization (30,890,289) (28,896,161)
Disposals 125,772 37,314
Impairment (expenses)/reversals (559,031) (155,693)
Effects of movements in exchange rates (1,210,744) (165,277)
Balance at end of year (357,849,752) (325,315,460)
Accumulated depreciation, amortization and impairment | Telecommunication licenses    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year (98,511,899) (90,877,046)
Additions - amortization (7,416,434) (7,446,046)
Disposals 31 19,530
Effects of movements in exchange rates (718,278) (208,337)
Balance at end of year (106,646,580) (98,511,899)
Accumulated depreciation, amortization and impairment | Computer software    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year (163,236,794) (151,201,408)
Additions - amortization (12,568,970) (11,194,611)
Disposals 115,424 13,683
Transfers 117,361  
Impairment (expenses)/reversals (558,903) (154,681)
Effects of movements in exchange rates (483,949) (699,777)
Balance at end of year (176,615,831) (163,236,794)
Accumulated depreciation, amortization and impairment | Transmission line software    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year (2,031,398) (1,971,530)
Additions - amortization (6,400) (42,044)
Effects of movements in exchange rates 10,435 (17,824)
Balance at end of year (2,027,363) (2,031,398)
Accumulated depreciation, amortization and impairment | Indefeasible right of usage    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year (1,309,287) (1,214,529)
Additions - amortization (51,396) (97,610)
Disposals   1,792
Effects of movements in exchange rates (439) 1,060
Balance at end of year (1,361,122) (1,309,287)
Accumulated depreciation, amortization and impairment | Brand name    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year (3,632) (18,547)
Effects of movements in exchange rates (6,239) 14,915
Balance at end of year (9,871) (3,632)
Accumulated depreciation, amortization and impairment | Customer base    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year (34,010) (53,561)
Additions - amortization (401) (826)
Effects of movements in exchange rates (8,403) 20,377
Balance at end of year (42,814) (34,010)
Accumulated depreciation, amortization and impairment | Subscriber acquisition cost    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year (58,141,692) (49,080,253)
Additions - amortization (10,419,947) (9,765,186)
Effects of movements in exchange rates 7,533 703,747
Balance at end of year (68,554,106) (58,141,692)
Accumulated depreciation, amortization and impairment | Electricity production license    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year (179,803) (99,108)
Additions - amortization (57,663) (57,171)
Transfers (78,096)  
Effects of movements in exchange rates 6,527 (23,524)
Balance at end of year (309,035) (179,803)
Accumulated depreciation, amortization and impairment | Others    
Disclosure of reconciliation of changes in intangible assets and goodwill    
Balance at beginning of year (1,866,945) (1,619,661)
Additions - amortization (369,078) (292,667)
Disposals 10,317 2,309
Transfers (39,265)  
Impairment (expenses)/reversals (128) (1,012)
Effects of movements in exchange rates (17,931) 44,086
Balance at end of year ₺ (2,283,030) ₺ (1,866,945)