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Other Financial Assets and Liabilities - Summary of Hedged items (Detail) - Derivatives [member] - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about hedged items [line items] |  |
Book value of hedged items | ₩ 2,643,046 | ₩ 2,673,253
Changes in fair value to calculate the ineffective portion of hedges | 151,817 | (60,696)
Cash flow hedge reserves | 19,779 | (7,609)
USD |  |
Disclosure of detailed information about hedged items [line items] |  |
Book value of hedged items | 1,924,576 | 1,822,477
Changes in fair value to calculate the ineffective portion of hedges | 133,978 | (45,855)
Cash flow hedge reserves | 19,641 | (5,214)
JPY |  |
Disclosure of detailed information about hedged items [line items] |  |
Book value of hedged items | 484,960 | 850,776
Changes in fair value to calculate the ineffective portion of hedges | 4,228 | (14,841)
Cash flow hedge reserves | (2,569) | ₩ (2,395)
SGD |  |
Disclosure of detailed information about hedged items [line items] |  |
Book value of hedged items | 233,510 |
Changes in fair value to calculate the ineffective portion of hedges | 13,611 |
Cash flow hedge reserves | ₩ 2,707 |

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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of a hedged item, recognised as an asset. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24B_a_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition A component of equity representing the reserve of cash flow hedges in relation to continuing hedges. [Refer: Reserve of cash flow hedges] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 24B -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_24B_b_ii&doctype=Standard -URIDate 2020-01-01 + Details
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