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Segment Information - Reconciliation of Adjusted EBITDA to Consolidated Profit Before Income Tax and Profit (Detail) - TRY (₺)
₺ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]      
Total revenue ₺ 21,292,475 ₺ 17,632,064 ₺ 14,285,561
Adjusted EBITDA 8,787,982 6,228,254 4,619,509
Bad debt expense (346,390) (36,278) (211,384)
Profit for the year 2,177,335 2,037,759 1,543,803
Profit/(loss) from discontinued operations     42,164
Profit from continuing operations 2,177,335 2,037,759 1,585,967
Income tax expense 495,481 571,758 423,160
Finance income (1,932,133) (818,436) (961,642)
Finance costs 3,619,091 1,141,302 1,134,441
Other income (241,435) (74,438) (78,569)
Other expenses 381,582 773,329 312,801
Depreciation and amortization 4,287,974 2,596,980 2,203,351
Share of loss of equity accounted investees 87    
Consolidated adjusted EBITDA 8,787,982 6,228,254 4,619,509
Turkcell Turkey segment [member]      
Disclosure of operating segments [line items]      
Total revenue 18,223,433 15,418,446 12,767,912
Turkcell International segment [member]      
Disclosure of operating segments [line items]      
Total revenue 1,387,323 1,026,181 855,728
All other segments [member]      
Disclosure of operating segments [line items]      
Total revenue 1,681,719 1,187,437 661,921
Segment revenue [member]      
Disclosure of operating segments [line items]      
Total revenue 21,292,475 17,632,064 14,285,561
Operating segments [member] | Turkcell Turkey segment [member]      
Disclosure of operating segments [line items]      
Total revenue 18,265,777    
Adjusted EBITDA 7,534,291 5,593,837 4,160,861
Bad debt expense (248,171) 49,468 (195,472)
Consolidated adjusted EBITDA 7,534,291 5,593,837 4,160,861
Operating segments [member] | Turkcell International segment [member]      
Disclosure of operating segments [line items]      
Total revenue 1,456,980    
Adjusted EBITDA 612,697 263,962 235,348
Bad debt expense (4,088) (6,070) (5,956)
Consolidated adjusted EBITDA 612,697 263,962 235,348
Operating segments [member] | All other segments [member]      
Disclosure of operating segments [line items]      
Total revenue 1,933,831    
Adjusted EBITDA 665,470 374,314 222,849
Bad debt expense (94,131) (79,676) (9,956)
Consolidated adjusted EBITDA 665,470 374,314 222,849
Operating segments [member] | Segment revenue [member] | Turkcell Turkey segment [member]      
Disclosure of operating segments [line items]      
Total revenue 18,265,777 15,450,136 12,787,592
Operating segments [member] | Segment revenue [member] | Turkcell International segment [member]      
Disclosure of operating segments [line items]      
Total revenue 1,456,980 1,067,078 874,692
Operating segments [member] | Segment revenue [member] | All other segments [member]      
Disclosure of operating segments [line items]      
Total revenue 1,933,831 1,187,454 661,923
Operating segments [member] | Inter-segment revenue [member] | Turkcell Turkey segment [member]      
Disclosure of operating segments [line items]      
Total revenue (42,344) (31,690) (19,680)
Operating segments [member] | Inter-segment revenue [member] | Turkcell International segment [member]      
Disclosure of operating segments [line items]      
Total revenue (69,657) (40,897) (18,964)
Operating segments [member] | Inter-segment revenue [member] | All other segments [member]      
Disclosure of operating segments [line items]      
Total revenue (252,112) (17) (2)
Intersegment eliminations [member]      
Disclosure of operating segments [line items]      
Total revenue (364,113)    
Adjusted EBITDA (24,476) (3,859) 451
Consolidated adjusted EBITDA (24,476) (3,859) 451
Intersegment eliminations [member] | Segment revenue [member]      
Disclosure of operating segments [line items]      
Total revenue (364,113) (72,604) (38,646)
Intersegment eliminations [member] | Inter-segment revenue [member]      
Disclosure of operating segments [line items]      
Total revenue ₺ 364,113 ₺ 72,604 ₺ 38,646