Prepaid Expenses - Summary of Incremental Costs of Obtaining Contracts That Capitalized as Assets and Related Amortization Recognized as Commissions (Detail) ₩ in Millions	12 Months Ended
Dec. 31, 2018 KRW (₩)
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [abstract]
Amortization recognized as commissions	₩ 2,002,460

The amount of amortisation for assets recognised from the costs incurred to obtain or fulfil contracts with customers. [Refer: Assets recognised from costs to obtain or fulfil contracts with customers; Amortisation expense]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2018-01-01
-Paragraph 128
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_128_b&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_AmortisationAssetsRecognisedFromCostsIncurredToObtainOrFulfilContractsWithCustomers
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration