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Financial Instruments by Category - Summary of Financial Instruments by Category (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade and other payables | ₩ 8,679,698 | ₩ 8,357,520 |  |
Borrowings | 7,298,867 | 6,648,293 |  |
Other financial liabilities | 150,079 | 164,396 |  |
Cash and cash equivalents | 2,305,894 | 2,703,422 | ₩ 1,928,182 | ₩ 2,900,311
Trade and other receivables | 7,004,725 | 6,523,344 |  |
Other financial assets | 1,690,046 | 1,617,956 |  |
Loans and receivables [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Cash and cash equivalents | 2,305,894 | 2,703,422 |  |
Trade and other receivables | 5,748,459 | 5,425,996 |  |
Other financial assets | 441,804 | 484,271 |  |
Financial assets at fair value through profit or loss [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Other financial assets | 632,324 | 777,685 |  |
Derivative used for hedge [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Other financial liabilities | 20,096 | 57,308 |  |
Other financial assets | 58,576 | 29,843 |  |
Financial liabilities designated as at fair value through profit or loss [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Other financial liabilities | 38 | 7,758 |  |
Financial liabilities at amortized cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade and other payables | 8,679,698 | 8,357,520 |  |
Borrowings | 7,298,867 | 6,648,293 |  |
Other financial liabilities | 129,945 | 99,330 |  |
Financial assets at fair value through other comprehensive income [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade and other receivables | 1,256,266 | 1,097,348 |  |
Other financial assets | ₩ 557,342 | ₩ 326,157 |  |

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_i&doctype=Standard -URIDate 2019-03-27 + Details
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