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Intangible assets - Summary of Intangible Assets and Goodwill (Detail) - TRY (₺)
₺ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year ₺ 84,478,038 ₺ 88,791,120
Additions net of amortization (3,461,095) (350,780)
Disposals (71,298) (326,526)
Transfers (35,890) 755,315
Asset held for sale   (4,764,217)
Impairment (expenses)/reversals (118,947) (33,741)
Effects of movements in exchange rates 1,081,554 406,867
Balance at end of year 81,872,362 84,478,038
Cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 310,721,736 295,182,566
Additions 18,615,188 24,679,035
Disposals (99,806) (715,712)
Transfers (35,890) 755,315
Asset held for sale   (10,230,635)
Impairment (expenses)/reversals   (10,361)
Effects of movements in exchange rates 1,207,823 1,061,528
Balance at end of year 330,409,051 310,721,736
Cost | Telecommunication licenses    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 98,620,686 101,284,877
Additions 1,026 5,216,431
Disposals (62,746) (86,334)
Transfers   262,501
Asset held for sale   (7,434,755)
Effects of movements in exchange rates 14,376 (622,034)
Balance at end of year 98,573,342 98,620,686
Cost | Computer software    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 149,697,122 138,268,118
Additions 10,551,603 11,418,517
Disposals (32,933) (250,178)
Transfers 292,253 654,440
Asset held for sale   (1,963,228)
Effects of movements in exchange rates 888,707 1,569,453
Balance at end of year 161,396,752 149,697,122
Cost | Transmission line software    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 1,520,659 1,488,153
Additions 1,119 1,403
Disposals (506) (5,325)
Effects of movements in exchange rates 17,288 36,428
Balance at end of year 1,538,560 1,520,659
Cost | Indefeasible right of usage    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 1,466,364 1,462,116
Additions 110,686 4,249
Effects of movements in exchange rates   (1)
Balance at end of year 1,577,050 1,466,364
Cost | Brand name    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 15,547 16,303
Additions   77
Disposals   (71)
Transfers   271
Asset held for sale   (886)
Effects of movements in exchange rates (3,402) (147)
Balance at end of year 12,145 15,547
Cost | Customer base    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 56,445 70,698
Effects of movements in exchange rates (6,764) (14,253)
Balance at end of year 49,681 56,445
Cost | Goodwill    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 588,963 606,037
Impairment (expenses)/reversals   (10,361)
Effects of movements in exchange rates   (6,713)
Balance at end of year 588,963 588,963
Cost | Subscriber acquisition cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 55,611,955 49,237,523
Additions 7,374,968 7,263,978
Disposals   (180,615)
Asset held for sale   (830,279)
Effects of movements in exchange rates 337,050 121,348
Balance at end of year 63,323,973 55,611,955
Cost | Electricity production license    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 964,442 1,024,900
Effects of movements in exchange rates (93,340) (60,458)
Balance at end of year 871,102 964,442
Cost | Others    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 1,800,954 1,614,237
Additions 282,042 238,131
Disposals (1,989) (1,242)
Transfers (35,890) (33,294)
Asset held for sale   (232)
Effects of movements in exchange rates 68,348 (16,646)
Balance at end of year 2,113,465 1,800,954
Cost | Construction in progress    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year 378,599 109,604
Additions 293,744 536,249
Disposals (1,632) (191,947)
Transfers (292,253) (128,603)
Asset held for sale   (1,255)
Effects of movements in exchange rates (14,440) 54,551
Balance at end of year 364,018 378,599
Accumulated depreciation, amortization and impairment    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year (226,243,698) (206,391,446)
Additions - amortization (22,076,283) (25,029,815)
Disposals 28,508 389,186
Asset held for sale   5,466,418
Impairment (expenses)/reversals (118,947) (23,380)
Effects of movements in exchange rates (126,269) (654,661)
Balance at end of year (248,536,689) (226,243,698)
Accumulated depreciation, amortization and impairment | Telecommunication licenses    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year (69,428,856) (68,226,836)
Additions - amortization (5,688,680) (6,172,793)
Disposals 14,921 6,881
Asset held for sale   4,611,507
Effects of movements in exchange rates (159,167) 352,385
Balance at end of year (75,261,782) (69,428,856)
Accumulated depreciation, amortization and impairment | Computer software    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year (115,515,868) (105,290,313)
Additions - amortization (8,552,534) (9,277,415)
Disposals 10,454 195,150
Asset held for sale   295,352
Impairment (expenses)/reversals (118,174) (22,691)
Effects of movements in exchange rates (534,620) (1,415,951)
Balance at end of year (124,710,742) (115,515,868)
Accumulated depreciation, amortization and impairment | Transmission line software    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year (1,506,223) (1,465,803)
Additions - amortization (32,121) (37,976)
Disposals   5,325
Effects of movements in exchange rates (13,617) (7,769)
Balance at end of year (1,551,961) (1,506,223)
Accumulated depreciation, amortization and impairment | Indefeasible right of usage    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year (927,884) (837,147)
Additions - amortization (74,573) (91,395)
Disposals 1,369  
Effects of movements in exchange rates 810 658
Balance at end of year (1,000,278) (927,884)
Accumulated depreciation, amortization and impairment | Brand name    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year (14,170) (23,840)
Additions - amortization   (94)
Disposals   30
Asset held for sale   491
Effects of movements in exchange rates 11,395 9,243
Balance at end of year (2,775) (14,170)
Accumulated depreciation, amortization and impairment | Customer base    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year (40,920) (50,607)
Additions - amortization (631) (2,895)
Effects of movements in exchange rates 15,568 12,582
Balance at end of year (25,983) (40,920)
Accumulated depreciation, amortization and impairment | Subscriber acquisition cost    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year (37,496,661) (29,407,136)
Additions - amortization (7,460,472) (9,214,832)
Disposals   180,615
Asset held for sale   558,856
Effects of movements in exchange rates 537,653 385,836
Balance at end of year (44,419,480) (37,496,661)
Accumulated depreciation, amortization and impairment | Electricity production license    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year (75,717) (14,348)
Additions - amortization (43,678) (43,555)
Effects of movements in exchange rates (17,972) (17,814)
Balance at end of year (137,367) (75,717)
Accumulated depreciation, amortization and impairment | Others    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Balance at beginning of year (1,237,399) (1,075,416)
Additions - amortization (223,594) (188,860)
Disposals 1,764 1,185
Asset held for sale   212
Impairment (expenses)/reversals (773) (689)
Effects of movements in exchange rates 33,681 26,169
Balance at end of year ₺ (1,426,321) ₺ (1,237,399)