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Derivative financial instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Statement [LineItems] |
Summary of Fair Value of Derivative Financial Instruments | Fair value of derivative financial instruments at 31 December 2018 and 2017 are attributable to the following:
|  | 31 December 2018 |  |  | 31 December 2017 |
|  | Assets |  |  | Liabilities |  |  | Assets |  |  | Liabilities |
Held for trading |  |  | 709,617 |  |  |  | 131,097 |  |  |  | 961,665 |  |  |  | 17,724 |
Derivatives used for hedging |  |  | 730,924 |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  |  | 1,440,541 |  |  |  | 131,097 |  |  |  | 961,665 |  |  |  | 17,724 |
Details of Participating Cross Currency Swap and FX Swap Contracts | Participating cross currency swap and FX swap contracts The notional amount and the fair value of participating cross currency swap and FX swap contracts for hedging purposes at 31 December 2018 are as follows:
Buy |  |  | Sell |  |  |  |  |  |
Currency |  | Notional amount |  |  | Currency |  | Notional amount |  |  | Fair Value |  |  | Maturity
Participating cross currency swap contracts |  |  |  |  |  |  |  |
TL |  |  | 1,650,000 |  |  | EUR |  |  | 500,000 |  |  |  | 208,462 |  |  | 23 October 2025
TL |  |  | 275,850 |  |  | EUR |  |  | 60,000 |  |  |  | 64,670 |  |  | 22 April 2026
TL |  |  | 435,000 |  |  | USD |  |  | 150,000 |  |  |  | 167,116 |  |  | 16 September 2020
TL |  |  | 293,500 |  |  | USD |  |  | 100,000 |  |  |  | 108,777 |  |  | 16 September 2020
TL |  |  | 194,000 |  |  | USD |  |  | 50,000 |  |  |  | 39,394 |  |  | 16 September 2020
TL |  |  | 386,500 |  |  | USD |  |  | 100,000 |  |  |  | 79,688 |  |  | 16 September 2020
TL |  |  | 113,400 |  |  | USD |  |  | 20,000 |  |  |  | 9,234 |  |  | 22 April 2026
Cross currency swap contracts |  |  |  |  |  |  |  |  |  |
TL |  |  | 123,878 |  |  | RMB |  |  | 202,600 |  |  |  | 53,583 |  |  | 22 April 2026
Derivatives used for hedge accounting financial assets |  |  |  | 730,924 |  |  |
EUR 500,000 participating cross currency swap contracts includes TL 690,146 guarantees after CSA agreement. Held for trading Currency swap, cross currency swap and participating cross currency swap contracts The notional amount and the fair value of currency swap, participating cross currency swap and FX swap contracts for hedging purposes at 31 December 2018 are as follows:
Buy |  |  | Sell |  |  |  |  |  |
Currency |  | Notional amount |  |  | Currency |  | Notional amount |  |  | Fair Value |  |  | Maturity
Currency Swap |  |  |  |  |  |  |  |  |  |
TL |  |  | 266,760 |  |  | USD |  |  | 50,000 |  |  |  | (3,715 | ) |  | 2 January 2019
TL |  |  | 266,510 |  |  | USD |  |  | 50,000 |  |  |  | (3,465 | ) |  | 2 January 2019
TL |  |  | 719,996 |  |  | USD |  |  | 135,000 |  |  |  | (9,774 | ) |  | 2 January 2019
TL |  |  | 212,736 |  |  | USD |  |  | 40,000 |  |  |  | (2,300 | ) |  | 2 January 2019
TL |  |  | 265,925 |  |  | USD |  |  | 50,000 |  |  |  | (2,880 | ) |  | 2 January 2019
TL |  |  | 1,366 |  |  | USD |  |  | 253 |  |  |  | (48 | ) |  | 19 March 2019
TL |  |  | 4,199 |  |  | USD |  |  | 680 |  |  |  | (939 | ) |  | 16 January 2019
TL |  |  | 5,681 |  |  | USD |  |  | 920 |  |  |  | (1,277 | ) |  | 22 January 2019
TL |  |  | 6,040 |  |  | EUR |  |  | 1,000 |  |  |  | (41 | ) |  | 2 January 2019
USD |  |  | 68,654 |  |  | EUR |  |  | 60,000 |  |  |  | (861 | ) |  | 15 January 2019
USD |  |  | 11,462 |  |  | EUR |  |  | 10,000 |  |  |  | (4 | ) |  | 8 January 2019
Cross currency swap contracts |  |  |
TL |  |  | 6,159 |  |  | USD |  |  | 1,000 |  |  |  | (912 | ) |  | 28 January 2019
TL |  |  | 6,159 |  |  | USD |  |  | 1,000 |  |  |  | (910 | ) |  | 24 January 2019
TL |  |  | 130,488 |  |  | USD |  |  | 24,000 |  |  |  | (9,365 | ) |  | 20 March 2023
TL |  |  | 268,200 |  |  | USD |  |  | 50,000 |  |  |  | (5,791 | ) |  | 14 June 2019
TL |  |  | 128,436 |  |  | USD |  |  | 24,000 |  |  |  | (2,652 | ) |  | 19 June 2019
TL |  |  | 169,368 |  |  | EUR |  |  | 24,000 |  |  |  | (24,895 | ) |  | 8 January 2019
TL |  |  | 118,800 |  |  | EUR |  |  | 18,000 |  |  |  | (22,051 | ) |  | 23 September 2021
TL |  |  | 111,732 |  |  | EUR |  |  | 18,867 |  |  |  | 1,920 |  |  | 14 February 2019
TL |  |  | 185,100 |  |  | EUR |  |  | 30,000 |  |  |  | (8,296 | ) |  | 22 April 2026
TL |  |  | 183,300 |  |  | EUR |  |  | 30,000 |  |  |  | (8,642 | ) |  | 22 April 2026
Participating cross currency swap contracts |  |  |
TL |  |  | 193,800 |  |  | EUR |  |  | 30,000 |  |  |  | (7,148 | ) |  | 16 September 2020
TL |  |  | 91,700 |  |  | USD |  |  | 20,000 |  |  |  | (17,051 | ) |  | 22 April 2026
Total Held for trading derivative financial liabilities |  |  |  | (131,097 | ) |  |
Held for trading
Buy |  |  | Sell |  |  |  |  |  |
Currency |  | Notional amount |  |  | Currency |  | Notional amount |  |  | Fair Value |  |  | Maturity
Cross currency swap contracts |  |  |
TL |  |  | 67,410 |  |  | USD |  |  | 18,000 |  |  |  | 27,928 |  |  | 28 January 2019
TL |  |  | 95,550 |  |  | USD |  |  | 25,000 |  |  |  | 36,751 |  |  | 24 January 2019
TL |  |  | 52,164 |  |  | USD |  |  | 14,620 |  |  |  | 27,870 |  |  | 16 July 2019
TL |  |  | 69,744 |  |  | USD |  |  | 19,780 |  |  |  | 38,636 |  |  | 22 July 2019
TL |  |  | 242,873 |  |  | USD |  |  | 70,500 |  |  |  | 160,594 |  |  | 16 September 2020
TL |  |  | 269,451 |  |  | USD |  |  | 70,500 |  |  |  | 131,437 |  |  | 22 December 2020
TL |  |  | 191,300 |  |  | USD |  |  | 50,000 |  |  |  | 74,095 |  |  | 13 February 2019
TL |  |  | 98,625 |  |  | EUR |  |  | 25,000 |  |  |  | 57,161 |  |  | 13 June 2019
TL |  |  | 203,600 |  |  | EUR |  |  | 50,000 |  |  |  | 109,610 |  |  | 23 July 2019
TL |  |  | 97,997 |  |  | EUR |  |  | 21,500 |  |  |  | 37,825 |  |  | 19 December 2019
TL |  |  | 105,280 |  |  | EUR |  |  | 18,800 |  |  |  | 7,710 |  |  | 23 September 2021
Total held for trading derivative financial assets |  |  |  | 709,617 |  |  |
Participating cross currency swap and FX swap contracts at 31 December 2017 |  |  |  |  |  |
Buy |  |  | Sell |  |  |  |  |  |
Currency |  | Notional amount |  |  | Currency |  | Notional amount |  |  | Fair value |  |  | Maturity
USD |  |  | 47,304 |  |  | EUR |  |  | 39,835 |  |  |  | 1,005 |  |  | 02 January 2018
TL |  |  | 69,680 |  |  | USD |  |  | 20,000 |  |  |  | 6,554 |  |  | 27 August 2018
TL |  |  | 81,480 |  |  | EUR |  |  | 20,000 |  |  |  | 9,965 |  |  | 14 December 2018
TL |  |  | 95,550 |  |  | USD |  |  | 25,000 |  |  |  | 72 |  |  | 24 January 2019
TL |  |  | 67,410 |  |  | USD |  |  | 18,000 |  |  |  | 1,498 |  |  | 28 January 2019
TL |  |  | 98,625 |  |  | EUR |  |  | 25,000 |  |  |  | 17,354 |  |  | 13 June 2019
TL |  |  | 52,164 |  |  | USD |  |  | 14,620 |  |  |  | 4,465 |  |  | 16 July 2019
TL |  |  | 69,744 |  |  | USD |  |  | 19,780 |  |  |  | 6,996 |  |  | 22 July 2019
TL |  |  | 203,600 |  |  | EUR |  |  | 50,000 |  |  |  | 27,198 |  |  | 23 July 2019
TL |  |  | 435,000 |  |  | USD |  |  | 150,000 |  |  |  | 142,085 |  |  | 16 September 2020
TL |  |  | 386,500 |  |  | USD |  |  | 100,000 |  |  |  | (4,645 | ) |  | 16 September 2020
TL |  |  | 293,500 |  |  | USD |  |  | 100,000 |  |  |  | 90,071 |  |  | 16 September 2020
TL |  |  | 242,873 |  |  | USD |  |  | 70,500 |  |  |  | 33,535 |  |  | 16 September 2020
TL |  |  | 194,000 |  |  | USD |  |  | 50,000 |  |  |  | (2,951 | ) |  | 16 September 2020
TL |  |  | 1,650,000 |  |  | EUR |  |  | 500,000 |  |  |  | 627,385 |  |  | 25 October 2025
TL |  |  | 275,850 |  |  | EUR |  |  | 60,000 |  |  |  | 1,078 |  |  | 22 April 2026
Total derivative financial assets |  |  |  | 961,665 |  |  |
Held for trading At 31 December 2017, total derivative financial assets of TL 981,396 also include net accrued interest income of TL 19,731.
Participating cross currency swap and FX swap contracts at 31 December 2017 |  |  |  |  |  |
Buy |  |  | Sell |  |  |  |  |  |
Currency |  | Notional amount |  |  | Currency |  | Notional amount |  |  | Fair value |  |  | Maturity
TL |  |  | 470,232 |  |  | USD |  |  | 122,680 |  |  |  | (2,465 | ) |  | 2 January 2018
TL |  |  | 180,023 |  |  | USD |  |  | 47,250 |  |  |  | (545 | ) |  | 2 January 2018
TL |  |  | 141,001 |  |  | USD |  |  | 36,786 |  |  |  | (726 | ) |  | 3 January 2018
TL |  |  | 219,162 |  |  | USD |  |  | 57,245 |  |  |  | (1,043 | ) |  | 4 January 2018
TL |  |  | 115,022 |  |  | USD |  |  | 30,150 |  |  |  | (435 | ) |  | 5 January 2018
TL |  |  | 17,204 |  |  | USD |  |  | 4,500 |  |  |  | (284 | ) |  | 10 January 2018
TL |  |  | 15,916 |  |  | EUR |  |  | 3,500 |  |  |  | (157 | ) |  | 10 January 2018
TL |  |  | 91,556 |  |  | EUR |  |  | 20,140 |  |  |  | (620 | ) |  | 22 January 2018
TL |  |  | 137,834 |  |  | EUR |  |  | 30,400 |  |  |  | (601 | ) |  | 05 February 2018
TL |  |  | 82,013 |  |  | EUR |  |  | 17,860 |  |  |  | (1,413 | ) |  | 19 February 2018
TL |  |  | 1,143 |  |  | EUR |  |  | 250 |  |  |  | (25 | ) |  | 5 Mart 2018
TL |  |  | 97,997 |  |  | EUR |  |  | 21,500 |  |  |  | (2,154 | ) |  | 19 December 2019
TL |  |  | 269,451 |  |  | USD |  |  | 70,500 |  |  |  | (5,010 | ) |  | 22 December 2020
Total derivative financial liabilities |  |  |  | (15,478 | ) |
Details of Currency Forward Contracts |
Currency forward contracts at 31 December 2017
Buy |  |  |  |  |  |  |  |
Currency |  |  | Notional amount |  |  | Fair value |  |  | Maturity
USD |  |  | 50,000 |  |  |  | (2,246 | ) |  | 30 January 2018
Total derivative financial liabilities |  |  |  | (2,246 | ) |  |
Summary of Fair Value of Financial Assets and Financial Liabilities | This section explains the judgements and estimates made in determining the fair values of the financial instruments that are recognized and measured at fair value in the financial statements. An explanation of each level is as follows:
|  | Fair values
|  | 31 December 2018 |  |  | 31 December 2017 |  |  | Fair Value hierarchy |  |  | Valuation Techniques
a)Participating cross currency swap contracts (*) |  |  | 653,142 |  |  |  | 950,862 |  |  |  | Level 3 |  |  | Pricing models based on discounted cash Present value of the estimated future cash flows based on unobservable yield curves and end period FX rates
-Held for trading |  |  | (24,199 | ) |  |  | 950,862 |  |  |  |  |  |  |
-Derivatives used for hedging |  |  | 677,341 |  |  |  | — |  |  |  |  |  |  |
b)FX swap contracts |  |  | 656,302 |  |  |  | (4,675 | ) |  |  | Level 2 |  |  | Present value of the estimated future cash flows based on observable yield curves and end period FX rates
-Held for trading |  |  | 602,719 |  |  |  | (4,675 | ) |  |  |  |  |  |
-Derivatives used for hedging |  |  | 53,583 |  |  |  | — |  |  |  |  |  |  |
c)Currency forward contracts |  |  | — |  |  |  | (2,246 | ) |  |  | Level 2 |  |  | Forward exchange rates at the balance sheet date
-Held for trading |  |  | — |  |  |  | (2,246 | ) |  |  |  |  |  |
(*) | TL 118,647 accrual of net interest expense has been reflected to consolidated financial statements as at 31 December 2018 (31 December 2017: TL 72,653). Since bid-ask spread is unobservable input; in valuation of participating cross currency swap contracts, prices in bid- ask price range which were considered the most appropriate were used instead of mid prices. If mid prices were used in the valuation the fair value of participating cross currency swap contracts would have been TL 123,995 lower as at 31 December 2018 (31 December 2017: TL 129,870).
Summary of Financial Assets and Financial Liabilities Measured and Recognised at Fair Value | The following table presents the Group’s financial assets and financial liabilities measured and recognised at fair value at 31 December 2018 and 2017 on a hedge accounting basis:
Fair values |
Participating cross currency swap contracts |  | Nominal Value |  |  | Maturity Date |  |  | 31 December 2018 |  |  | 31 December 2017 |  |  | Fair Value hierarchy |  |  | Hedge Ratio |  |  | Change in intrinsic value of outstanding hedging instruments since 1 July |  |  | Change in value of hedging item used to determine hedge effectiveness |
EUR Contracts |  |  | 500,000 |  |  |  | 23 October 2025 |  |  |  | 208,462 |  |  |  | 627,385 |  |  |  | Level 3 |  |  |  | 1:1 |  |  |  | 359,400 |  |  |  | (359,400 | )
EUR Contracts |  |  | 60,000 |  |  |  | 22 April 2026 |  |  |  | 64,670 |  |  |  | 1,078 |  |  |  | Level 3 |  |  |  | 1:1 |  |  |  | 43,128 |  |  |  | (43,128 | )
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | — |
USD Contracts |  |  | 400,000 |  |  |  | 16 September 2020 |  |  |  | 394,975 |  |  |  | 224,560 |  |  |  | Level 3 |  |  |  | 1:1 |  |  |  | 179,388 |  |  |  | (179,388 | )
USD Contracts |  |  | 20,000 |  |  |  | 10 April 2026 |  |  |  | 9,234 |  |  |  | — |  |  |  | Level 3 |  |  |  | 1:1 |  |  |  | 13,519 |  |  |  | (13,519 | )
CNY Contracts |  |  | 202,600 |  |  |  | 22 April 2026 |  |  |  | 53,583 |  |  |  | — |  |  |  | Level 2 |  |  |  | 1:1 |  |  |  | 15,600 |  |  |  | (15,600 | )
Summary of Cash Flow Sensitivity Analysis for Variable Rate Instruments | An increase/decrease of interest rates by 100 basis points would have (decreased)/increased equity and profit or loss by the amounts shown below. This analysis assumes that all other variables, in particular foreign exchange rates, remain constant. The analysis is performed on the same basis at 31 December 2018 and 2017:
|  | Profit or loss |  |  | Equity |
|  | 100 bps increase |  |  | 100 bps decrease |  |  | 100 bps increase |  |  | 100 bps decrease |
31 December 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate instruments (financial liability) |  |  | (234,196 | ) |  |  | 234,196 |  |  |  | — |  |  |  | — |
Cash flow sensitivity (net) |  |  | (234,196 | ) |  |  | 234,196 |  |  |  | — |  |  |  | — |
31 December 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate instruments (financial liability) |  |  | (83,922 | ) |  |  | 83,922 |  |  |  | — |  |  |  | — |
Cash flow sensitivity (net) |  |  | (83,922 | ) |  |  | 83,922 |  |  |  | — |  |  |  | — |
Summary of Reconciliation by Risk Category of Components of Equity and Analysis of OCI Items, Net of Tax | The following table provides a reconciliation by risk category of components of equity and analysis of OCI items, net of tax, resulting from cash flow hedge accounting.
|  | 2018 |
|  | Hedging Reserve |  |  | Cost of Hedging Reserve |
Balance at 1 January 2018 |  |  | — |  |  |  | — |
Cash Flow Hedges |  |  |  |  |  |  |  |
Changes in fair value: |  |  | 683,706 |  |  |  | (448,833 | )
Foreign currency risk |  |  | 612,733 |  |  |  | (448,833 | )
Interest rate risk |  |  | 70,973 |  |  |  | — |
Amount reclassified into profit or loss: |  |  | (664,550 | ) |  |  | 101,231 |
Foreign currency risk |  |  | (611,035 | ) |  |  | 101,231 |
Interest rate risk |  |  | (53,515 | ) |  |  | — |
Tax on movements during the year: |  |  | (4,214 | ) |  |  | 76,472 |
Balance at 31 December 2018 |  |  | 14,942 |  |  |  | (271,130 | )
Interest rate risk and currency risk [member] |
Statement [LineItems] |
Summary of Cash Flow Sensitivity Analysis for Variable Rate Instruments |
|  | Profit or Loss |  |  | Equity, net of tax |
|  | 100 bp increase |  |  | 100 bp decrease |  |  | 100 bp increase |  |  | 100 bp decrease |
31 December 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Participating cross currency swap contracts |  |  | 937,845 |  |  |  | 9,455 |  |  |  | (360,596 | ) |  |  | (259,066 | )
Cross currency swap contracts |  |  | 31,584 |  |  |  | 320 |  |  |  | 1,452 |  |  |  | 4,765 |
Cash Flow sensitivity (net) |  |  | 969,429 |  |  |  | 9,775 |  |  |  | (359,144 | ) |  |  | (254,301 | )
Participating cross currency swap contracts [member] |
Statement [LineItems] |
Summary of Fair Value of Financial Assets and Financial Liabilities | Movements in the participating cross currency swap contracts for the years ended 31 December 2018 and 31 December 2017 are stated below:
|  | 31 December 2018 |  |  | 31 December 2017 |
Opening balance |  |  | 950,862 |  |  |  | 382,054 |
Cash flow effect |  |  | (612,466 | ) |  |  | — |
Total gain/loss: |  |  |  |  |  |  |  |
Gains recognized in profit or loss |  |  | 314,746 |  |  |  | 568,808 |
Closing balance |  |  | 653,142 |  |  |  | 950,862 |
Consideration payable in relation to acquisition of Belarusian telecom [member] |
Statement [LineItems] |
Summary of Fair Value of Financial Assets and Financial Liabilities | Changes in the consideration payable in relation to acquisition of Belarusian Telecom for the years ended 31 December 2018 and 31 December 2017 are stated below:
|  | 2018 |  |  | 2017 |
Opening balance |  |  | 323,691 |  |  |  | 295,062 |
Gains recognized in profit or loss |  |  | 34,613 |  |  |  | 28,629 |
Closing balance |  |  | 358,304 |  |  |  | 323,691 |

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