XML 64 R49.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Financial Instruments by Category (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Text block1 [abstract] |
Summary of Financial Instruments by Category | Financial instruments by category as of December 31, 2016 and 2017, are as follows:
(In millions of Korean won) |  | 2016 |
Financial assets |  | Loans and receivables |  |  | Assets at fair value through profit and loss |  |  | Derivatives used for hedge |  |  | Available- for-sale |  |  | Held-to- Maturity |  |  | Total |
Cash and cash equivalents |  | ￦ | 2,900,311 |  |  | ￦ | — |  |  | ￦ | — |  |  | ￦ | — |  |  | ￦ | — |  |  | ￦ | 2,900,311 |
Trade and other receivables |  |  | 6,036,363 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,036,363 |
Other financial assets |  |  | 716,769 |  |  |  | 6,277 |  |  |  | 227,318 |  |  |  | 404,774 |  |  |  | 30,143 |  |  |  | 1,385,281 |
(In millions of Korean won) |  | 2016 |
Financial liabilities |  | Liabilities at fair value through profit and loss |  |  | Derivatives used for hedge |  |  | Financial liabilities at amortized cost |  |  | Total |
Trade and other payables |  | ￦ | — |  |  | ￦ | — |  |  | ￦ | 8,328,082 |  |  | ￦ | 8,328,082 |
Borrowings |  |  | — |  |  |  | — |  |  |  | 8,120,791 |  |  |  | 8,120,791 |
Other financial liabilities |  |  | 1,973 |  |  |  | 14,928 |  |  |  | 91,763 |  |  |  | 108,664 |
(In millions of Korean won) |  | 2017 |
Financial assets |  | Loans and receivables |  |  | Assets at fair value through profit and loss |  |  | Derivatives used for hedge |  |  | Available- for-sale |  |  | Held-to- Maturity |  |  | Total |
Cash and cash equivalents |  | ￦ | 1,928,182 |  |  | ￦ | — |  |  | ￦ | — |  |  | ￦ | — |  |  | ￦ | — |  |  | ￦ | 1,928,182 |
Trade and other receivables |  |  | 6,643,115 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 6,643,115 |
Other financial assets |  |  | 1,333,317 |  |  |  | 5,813 |  |  |  | 7,389 |  |  |  | 380,953 |  |  |  | 151 |  |  |  | 1,727,623 |
(In millions of Korean won) |  | 2017 |
Financial liabilities |  | Liabilities at fair value through profit and loss |  |  | Derivatives used for hedge |  |  | Financial liabilities at amortized cost |  |  | Total |
Trade and other payables |  | ￦ | — |  |  | ￦ | — |  |  | ￦ | 8,425,503 |  |  | ￦ | 8,425,503 |
Borrowings |  |  | — |  |  |  | — |  |  |  | 6,683,662 |  |  |  | 6,683,662 |
Other financial liabilities |  |  | 5,051 |  |  |  | 93,770 |  |  |  | 87,669 |  |  |  | 186,490 |
Summary of Gains or Losses Arising From Financial Instruments by Category | Gains or losses arising from financial instruments by category for the years ended December 31, 2015, 2016 and 2017, are as follows:
(In millions of Korean won) |  | 2015 |  |  | 2016 |  |  | 2017 |
Loans and receivables |  |  |  |  |  |  |  |  |  |  |  |
Interest income1, 4 |  | ￦ | 85,603 |  |  | ￦ | 129,813 |  |  | ￦ | 108,608 |
Loss on foreign currency transaction |  |  | (365 | ) |  |  | (7,493 | ) |  |  | (11,949 | )
Gain(loss) on foreign currency translation |  |  | 1,921 |  |  |  | 3,083 |  |  |  | (12,354 | )
Loss on disposal |  |  | (2,539 | ) |  |  | (15,838 | ) |  |  | (20,351 | )
Loss on valuation |  |  | (141,555 | ) |  |  | (92,589 | ) |  |  | (44,219 | )
Assets at fair value through profit or loss |  |  |  |  |  |  |  |  |  |  |  |
Dividend income |  |  | — |  |  |  | — |  |  |  | 1 |
Gain on disposal |  |  | 368 |  |  |  | 186 |  |  |  | 153 |
Loss on valuation |  |  | — |  |  |  | (7,184 | ) |  |  | (464 | )
Derivatives used for hedging |  |  |  |  |  |  |  |  |  |  |  |
Loss on transaction |  |  | (5,157 | ) |  |  | — |  |  |  | (58,569 | )
Gain(loss) on valuation |  |  | 141,512 |  |  |  | 109,436 |  |  |  | (63,640 | )
Other comprehensive income for the year2 |  |  | 100,401 |  |  |  | 60,501 |  |  |  | (44,429 | )
Reclassified to profit or loss from other comprehensive income for the year2,3 |  |  | (88,003 | ) |  |  | (71,915 | ) |  |  | 50,231 |
Available-for-sale |  |  |  |  |  |  |  |  |  |  |  |
Interest income1,4 |  |  | 73 |  |  |  | 40 |  |  |  | 453 |
Dividend income |  |  | 7,733 |  |  |  | 3,926 |  |  |  | 5,174 |
Gain on disposal |  |  | 131,045 |  |  |  | 22,695 |  |  |  | 89,598 |
Impairment loss |  |  | (1,471 | ) |  |  | (966 | ) |  |  | (6,137 | )
Other comprehensive income for the year2 |  |  | 47,381 |  |  |  | 10,925 |  |  |  | 51,235 |
Reclassified to profit or loss from other comprehensive income for the year2 |  |  | (83,397 | ) |  |  | (3,840 | ) |  |  | (55,450 | )
Held-to-Maturity |  |  |  |  |  |  |  |  |  |  |  |
Interest income1,4 |  |  | 226 |  |  |  | 213 |  |  |  | — |
Liabilities at fair value through profit and loss |  |  |  |  |  |  |  |  |  |  |  |
Gain(loss) on disposal |  |  | (850 | ) |  |  | (632 | ) |  |  | — |
Gain(loss) on valuation |  |  | (2,006 | ) |  |  | 33 |  |  |  | (3,078 | )
Derivatives used for hedging |  |  |  |  |  |  |  |  |  |  |  |
Gain(loss) on transactions |  |  | (273 | ) |  |  | 8,329 |  |  |  | — |
Loss on valuation |  |  | (1,733 | ) |  |  | (138 | ) |  |  | (145,885 | )
Other comprehensive income for the year2 |  |  | 11,513 |  |  |  | 4,295 |  |  |  | (66,624 | )
Reclassified to profit or loss from other comprehensive income for the year 2,3 |  |  | (9,959 | ) |  |  | (3,956 | ) |  |  | 91,698 |
Financial liabilities at amortized cost |  |  |  |  |  |  |  |  |  |  |  |
Interest expense4 |  |  | (385,925 | ) |  |  | (337,219 | ) |  |  | (302,464 | )
Gain(loss) foreign currency transaction |  |  | (23,416 | ) |  |  | (7,518 | ) |  |  | 62,347 |
Gain(loss) foreign currency translation |  |  | (166,254 | ) |  |  | (112,864 | ) |  |  | 225,695 |
Total |  | ￦ | (385,127 | ) |  | ￦ | (308,677 | ) |  | ￦ | (150,420 | )
1 | BC Card, a subsidiary of the Group, recognized interest income as operating revenue. Interest income recognized as operating revenue is ￦ 15,561 million (2015: ￦ 15,867 million, 2016: ￦ 14,380 million) for the year ended December 31, 2017.
2 | The amounts directly reflected in equity after adjustments of deferred income tax.
3 | During the year, certain derivatives of the Group were settled and the related gain or loss on valuation of cash flow hedge in other comprehensive income was reclassified to profit or loss for the year.
4 | BC Card recognized gain/loss on foreign currency transaction as operating income and expenses. During the year, related gain/loss on foreign currency transaction recognized as operating income and expense is ￦ 11,049 million (2016: (-) ￦ 1,987 million).

X
- Definition The disclosure of gain loss on financial instruments. + References No definition available. + Details
Name: | kt_DisclosureOfGainLossOnFinancialInstrumentsExplanatory
Namespace Prefix: | kt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition The disclosure of instruments by category + References No definition available. + Details
Name: | kt_DisclosureOfInstrumentsByCategoryExplanatory
Namespace Prefix: | kt_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Text block1 [abstract] + References No definition available. + Details
Name: | kt_TextBlock1Abstract
Namespace Prefix: | kt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration