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Risk Management - Summary of Maturity Analysis for Non Derivative Financial Assets (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |  |  |  |
Cash and cash equivalents |  | ₩ 2,635,238 | ₩ 2,029,584 | ₩ 1,810,129 | ₩ 1,358,345
Financial assets at fair value through other comprehensive income |  | 435,107 | 358,559 |  |
Financial assets at amortised cost |  | 25,273 | 14,422 |  |
Loans |  | 939,126 | 821,094 |  |
Long-term/short-term financial instruments |  | 1,728,508 | 2,062,103 |  |
Financial assets at fair value through profit or loss |  | 1,032,864 | 1,881,382 |  |
Trade and other receivables |  | 10,036,206 | 9,784,899 |  |
Financial assets held for managing liquidity risk |  | 16,832,322 | 16,952,043 |  |
Less than 1 year |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |  |  |  |
Cash and cash equivalents |  | 2,635,238 | 2,029,584 |  |
Financial assets at fair value through other comprehensive income |  | 0 | 0 |  |
Financial assets at amortised cost |  | 15,422 | 13,149 |  |
Loans |  | 88,396 | 78,805 |  |
Long-term/short-term financial instruments |  | 1,278,014 | 1,483,482 |  |
Financial assets at fair value through profit or loss |  | 360,833 | 1,196,101 |  |
Trade and other receivables |  | 8,123,455 | 7,920,005 |  |
Financial assets held for managing liquidity risk |  | 12,501,358 | 12,721,126 |  |
1~5 Years |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |  |  |  |
Cash and cash equivalents |  | 0 | 0 |  |
Financial assets at fair value through other comprehensive income |  | 0 | 0 |  |
Financial assets at amortised cost |  | 9,840 | 1,265 |  |
Loans |  | 443,146 | 385,571 |  |
Long-term/short-term financial instruments |  | 171,636 | 252,349 |  |
Financial assets at fair value through profit or loss |  | 346 | 0 |  |
Trade and other receivables |  | 1,233,703 | 1,160,400 |  |
Financial assets held for managing liquidity risk |  | 1,858,671 | 1,799,585 |  |
More than 5 years |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |  |  |  |
Cash and cash equivalents |  | 0 | 0 |  |
Financial assets at fair value through other comprehensive income |  | 0 | 0 |  |
Financial assets at amortised cost |  | 11 | 8 |  |
Loans |  | 407,584 | 325,212 |  |
Long-term/short-term financial instruments |  | 286 | 386 |  |
Financial assets at fair value through profit or loss |  | 3,130 | 2,690 |  |
Trade and other receivables |  | 679,048 | 704,494 |  |
Financial assets held for managing liquidity risk |  | 1,090,059 | 1,032,790 |  |
Other |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |  |  |  |
Cash and cash equivalents | [1] | 0 | 0 |  |
Financial assets at fair value through other comprehensive income | [1] | 435,107 | 358,559 |  |
Financial assets at amortised cost | [1] | 0 | 0 |  |
Loans | [1] | 0 | 31,506 |  |
Long-term/short-term financial instruments | [1] | 278,572 | 325,886 |  |
Financial assets at fair value through profit or loss | [1] | 668,555 | 682,591 |  |
Trade and other receivables | [1] | 0 | 0 |  |
Financial assets held for managing liquidity risk | [1] | ₩ 1,382,234 | ₩ 1,398,542 |  |
[1] | The maturities cannot be presently determined.

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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 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 8 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_8_f&doctype=Standard -URIDate 2021-03-24 + Details
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