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Financial Instruments by Category - Summary of Financial Instruments by Category (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Trade and other payables | ₩ 8,425,503 | ₩ 8,328,082 |  |
Borrowings | 6,683,662 | 8,120,791 |  |
Other financial liabilities | 186,490 | 108,664 |  |
Cash and cash equivalents | 1,928,182 | 2,900,311 | ₩ 2,559,464 | ₩ 1,888,663
Trade and other receivables | 6,643,115 | 6,036,363 |  |
Other financial assets | 1,727,623 | 1,385,281 |  |
Loans and receivables [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Cash and cash equivalents | 1,928,182 | 2,900,311 |  |
Trade and other receivables | 6,643,115 | 6,036,363 |  |
Other financial assets | 1,333,317 | 716,769 |  |
Financial assets at fair value through profit or loss [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Other financial assets | 5,813 | 6,277 |  |
Derivatives contracts [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Other financial liabilities | 93,770 | 14,928 |  |
Other financial assets | 7,389 | 227,318 |  |
Available-for-sale [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Other financial assets | 380,953 | 404,774 |  |
Held-to-maturity financial assets [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Other financial assets | 151 | 30,143 |  |
Financial liabilities designated as at fair value through profit or loss [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Other financial liabilities | 5,051 | 1,973 |  |
Financial liabilities at amortized cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Trade and other payables | 8,425,503 | 8,328,082 |  |
Borrowings | 6,683,662 | 8,120,791 |  |
Other financial liabilities | ₩ 87,669 | ₩ 91,763 |  |

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