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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
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Summary Of Major Commitments With Local Financial Institutions | As of December 31, 2017, major commitments with local financial institutions are as follows:
(In millions of Korean won and foreign currencies in thousands) |  | Financial institution |  | Currency |  |  | Limit |  |  | Used amount |
Bank overdraft |  | Kookmin Bank and others |  |  | KRW |  |  |  | 1,730,000 |  |  |  | 72 |
Commercial papers |  | NH Investment & Securities Co., Ltd. |  |  | KRW |  |  |  | 370,000 |  |  |  | 300,000 |
Collateralized loan on accounts receivable-trade |  | NongHyup Bank and others |  |  | KRW |  |  |  | 35,560 |  |  |  | — |
Collateralized loan on electronic accounts receivable-trade |  | Shinhan Bank and others |  |  | KRW |  |  |  | 343,000 |  |  |  | 42,350 |
Plus electronic notes payable |  | Industrial Bank of Korea |  |  | KRW |  |  |  | 50,000 |  |  |  | 140 |
Loans for working capital |  | Korea Development Bank and others |  |  | KRW |  |  |  | 306,500 |  |  |  | 207,300 |
Green energy factoring |  | Shinhan Bank |  |  | KRW |  |  |  | 16 |  |  |  | 16 |
FX forward trading commitment |  | Shinhan Bank |  |  | USD |  |  |  | 11,500 |  |  |  | — |
Facility loans |  | Kookmin Bank and others |  |  | KRW |  |  |  | 8,456 |  |  |  | 8,456 |
|  |  |  |  | USD |  |  |  | 212,000 |  |  |  | 166,108 |
Facility loans on ships |  | Shinhan Bank |  |  | USD |  |  |  | 30,000 |  |  |  | 15,000 |
Inter-Korean Cooperation Fund |  | Export-Import Bank of Korea |  |  | KRW |  |  |  | 37,700 |  |  |  | 4,688 |
Total |  |  |  |  | KRW |  |  |  | 2,881,232 |  |  |  | 563,022 |
|  |  |  |  | USD |  |  |  | 253,500 |  |  |  | 181,108 |
Summary of Guarantees Received from Financial Institutions | As of December 31, 2017, guarantees received from financial institutions are as follows:
(In millions of Korean won and thousands of foreign currencies) |  | Financial institution |  | Currency |  |  | Limit |
Performance guarantee |  | Seoul Guarantee Insurance and others |  |  | KRW |  |  |  | 116,787 |
|  |  |  |  | USD |  |  |  | 1,275 |
Guarantee for import letters of credit |  | Industrial Bank of Korea and others |  |  | USD |  |  |  | 5,980 |
Guarantee for payment in foreign currency |  | KEB Hana and others |  |  | USD |  |  |  | 54,072 |
|  |  |  |  | PLN | 1 |  |  | 23,000 |
Guarantee for advances received |  | Export-Import Bank of Korea |  |  | USD |  |  |  | 7,414 |
Comprehensive credit line |  | KEB Hana Bank and others |  |  | KRW |  |  |  | 55,000 |
Bid guarantee |  | KEB Hana Bank |  |  | USD |  |  |  | 400 |
Bid guarantee |  | Korea Software Financial Cooperative |  |  | KRW |  |  |  | 96,911 |
Performance guarantee /Warranty Guarantee |  |  |  |  | KRW |  |  |  | 302,062 |
Guarantee for advances received/others |  | Korea Software Financial Cooperative and others |  |  | KRW |  |  |  | 99,228 |
Warranty guarantee |  | Seoul Guarantee Insurance |  |  | KRW |  |  |  | 2,962 |
Guarantees for licensing |  |  |  |  | KRW |  |  |  | 4,077 |
Guarantees for public sale |  |  |  |  | KRW |  |  |  | 50 |
Guarantees for deposits |  | Seoul Guarantee Insurance and others |  |  | KRW |  |  |  | 4,203 |
Total |  |  |  |  | KRW |  |  |  | 681,280 |
|  |  |  |  | USD |  |  |  | 69,141 |
|  |  |  |  | PLN | 1 |  |  | 23,000 |
1 | Polish Zloty.
Summary Of Guarantees Provided By The Group For Third Parties | As of December 31, 2017, guarantees provided by the Group to a third party, are as follows:
(in millions of Korean won) |  | Subject to payment guarantees |  | Creditor |  | Limit |  |  | Used amount |  |  | Period |
KT Estate Inc. |  | Busan Gaya Centreville Buyers |  | Shinhan Bank |  |  | ￦48,536 |  |  |  | ￦8,309 |  |  |  | Nov 10, 2017 ~Oct. 31, 2020 |
KT Estate Inc. |  | Daegu Beomeo -Crossroads SeohanIDaum Buyers |  | Shinhan Bank |  |  | 81,722 |  |  |  | 14,237 |  |  |  | Oct 29, 2017 ~Nov. 30, 2020 |
KT Hitel Co., Ltd. |  | KEB Hana Bank |  | Cash payers |  |  | 384 |  |  |  | — |  |  |  | Apr 19, 2017 ~ Apr 19, 2018 |

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