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Other Financial Assets and Liabilities - Summary of Hedged items (Detail) - Derivatives [member] - KRW (₩) ₩ in Millions	12 Months Ended
	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

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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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
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-IssueDate 2020-01-01
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- Definition

The amount of a hedged item, recognised as an asset. [Refer: Hedged items [member]]

+ References

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-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 24B
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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

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