Geographic and Other Information - Revenue and Non-current Assets by Geography (Parenthetical) (Details) ₩ in Millions	12 Months Ended
Dec. 31, 2022 KRW (₩)
Disclosure of geographical areas [abstract]
Forward exchange hedging loss	₩ 212,956

Forward exchange hedging loss which was reclassified from accumulated other comprehensive income to revenue.

No definition available.

Name:	lpl_ForwardExchangeHedgingIncomeLossReclassifiedFromAccumulatedOtherComprehensiveIncome
Namespace Prefix:	lpl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration