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Financial Instruments by Category - Summary of Financial Instruments by Category (Detail) ₩ in Millions | Dec. 31, 2020 KRW (₩) | Dec. 31, 2020 SGD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 KRW (₩) | Dec. 31, 2018 KRW (₩) | Dec. 31, 2017 KRW (₩)
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Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Trade and other payables | ₩ 7,017,639 |  |  | ₩ 8,679,698 |  |
Borrowings | 7,316,298 | $ 284,000,000 | $ 519,598,989 | 7,298,867 |  |
Other financial liabilities | 263,169 |  |  | 150,079 |  |
Cash and cash equivalents | 2,634,624 |  |  | 2,305,894 | ₩ 2,703,422 | ₩ 1,928,182
Trade and other receivables | 6,095,042 |  |  | 7,004,725 |  |
Other financial assets | 1,747,187 |  |  | 1,690,046 |  |
Loans and receivables [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Cash and cash equivalents | 2,634,624 |  |  | 2,305,894 |  |
Trade and other receivables | 4,976,423 |  |  | 5,748,459 |  |
Other financial assets | 671,068 |  |  | 441,804 |  |
Financial assets at fair value through profit or loss [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Other financial assets | 809,919 |  |  | 632,324 |  |
Derivative used for hedge [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Other financial liabilities | 127,929 |  |  | 20,096 |  |
Other financial assets | 7,684 |  |  | 58,576 |  |
Financial liabilities designated as at fair value through profit or loss [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Other financial liabilities | 2,682 |  |  | 38 |  |
Financial liabilities at amortized cost [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Trade and other payables | 7,017,639 |  |  | 8,679,698 |  |
Borrowings | 7,316,298 |  |  | 7,298,867 |  |
Other financial liabilities | 132,558 |  |  | 129,945 |  |
Financial assets at fair value through other comprehensive income [member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |  |
Trade and other receivables | 1,118,619 |  |  | 1,256,266 |  |
Other financial assets | ₩ 258,516 |  |  | ₩ 557,342 |  |

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