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Related Party Transactions - Summary of Related Parties Outstanding Balances of Receivables and Payables (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Trade receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | ₩ 2,249 | ₩ 1,440
Loans and receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 2,510 |
Other receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 43,369 | 33,298
Trade payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables |  | 3
Other payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables | 7,536 | 55,000
KT Wibro Infra Co., Ltd. [member] | Other payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables |  | 43,394
K-Realty CR-REITs No.1 [member] | Trade receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 778 | 882
K-Realty CR-REITs No.1 [member] | Other receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 33,800 | 33,110
MOS GS Co., Ltd. [member] | Trade receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 17 | 9
MOS GS Co., Ltd. [member] | Other receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables |  | 1
MOS GS Co., Ltd. [member] | Other payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables | 392 | 1,494
MOS Daegu Co., Ltd. [member] | Trade receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 1 | 1
MOS Daegu Co., Ltd. [member] | Other payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables | 1,388 | 1,082
MOS Chungcheong Co., Ltd. [member] | Trade receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 1 | 6
MOS Chungcheong Co., Ltd. [member] | Other receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 290 | 1
MOS Chungcheong Co., Ltd. [member] | Other payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables | 1,827 | 2,065
MOS Gangnam Co., Ltd. [member] | Trade receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 6 | 6
MOS Gangnam Co., Ltd. [member] | Other receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 1 | 1
MOS Gangnam Co., Ltd. [member] | Other payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables | 287 | 1,129
MOS GB Co., Ltd. [member] | Trade receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 17 | 19
MOS GB Co., Ltd. [member] | Other receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 1 | 5
MOS GB Co., Ltd. [member] | Other payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables | 778 | 2,167
MOS BS Co., Ltd. [member] | Trade receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 34 | 34
MOS BS Co., Ltd. [member] | Other receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 1 | 1
MOS BS Co., Ltd. [member] | Other payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables | 46 | 1,114
MOS Honam Co., Ltd. [member] | Trade receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 2 | 2
MOS Honam Co., Ltd. [member] | Other receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 1 |
MOS Honam Co., Ltd. [member] | Other payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables | 384 | 1,289
Others [member] | Trade receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 54 | 481
Others [member] | Other receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 1,281 | 179
Others [member] | Trade payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables |  | 3
Others [member] | Other payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables | 2,135 | ₩ 1,266
K Bank Inc. [member] | Trade receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 1,338 |
K Bank Inc. [member] | Other receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 7,994 |
K Bank Inc. [member] | Other payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables | 296 |
NgeneBio [Member] | Trade receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 1 |
NgeneBio [Member] | Loans and receivables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Receivables | 2,510 |
NgeneBio [Member] | Other payables [member] |  |
Disclosure of transactions between related parties [Line Items] |  |
Payables | ₩ 3 |

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