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Financial Instruments by Category - Summary of Financial Instruments by Category (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade and other payables | ₩ 7,980,203 | ₩ 7,017,639 |  |
Borrowings | 8,437,703 | 7,316,298 |  |
Other financial liabilities | 497,666 | 263,169 |  |
Lease liabilities | 1,159,369 | 1,143,640 |  |
Cash and cash equivalents | 3,019,592 | 2,634,624 | ₩ 2,305,894 | ₩ 2,703,422
Trade and other receivables | 6,178,816 | 6,153,241 |  |
Other financial assets | 2,008,038 | 1,747,187 |  |
Loans and receivables [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Cash and cash equivalents | 3,019,592 | 2,634,624 |  |
Trade and other receivables | 5,687,103 | 5,034,622 |  |
Other financial assets | 608,389 | 671,068 |  |
Financial assets at fair value through profit or loss [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Other financial assets | 952,319 | 809,919 |  |
Derivative used for hedge [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Other financial liabilities | 18,126 | 127,929 |  |
Other financial assets | 99,453 | 7,684 |  |
Financial liabilities designated as at fair value through profit or loss [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Other financial liabilities | 216,040 | 2,682 |  |
Financial liabilities at amortized cost [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade and other payables | 7,980,203 | 7,017,639 |  |
Borrowings | 8,437,703 | 7,316,298 |  |
Other financial liabilities | 263,500 | 132,558 |  |
Financial assets at fair value through other comprehensive income [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Trade and other receivables | 491,713 | 1,118,619 |  |
Other financial assets | 347,877 | 258,516 |  |
Others [member] |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Lease liabilities | ₩ 1,159,369 | ₩ 1,143,640 |  |

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