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Reporting Entity - Summary of Consolidated Subsidiaries (Detail)
€ in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, zł in Millions, $ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
KRW (₩)
Dec. 31, 2018
KRW (₩)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
JPY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
PLN (zł)
Disclosure of subsidiaries [line items]                
Fiscal year end --12-31              
Date of incorporation [1] Jul. 11, 2018              
Capital stocks | ₩ ₩ 1,789,079 ₩ 1,789,079            
LG Display America, Inc. [member]                
Disclosure of subsidiaries [line items]                
Location San Jose, U.S.A.              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Sep. 24, 1999              
Business Sell display products              
Capital stocks | $     $ 411.0          
LG Display Japan Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location Tokyo, Japan              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Oct. 12, 1999              
Business Sell display products              
Capital stocks       ¥ 95        
LG Display Germany GmbH [member]                
Disclosure of subsidiaries [line items]                
Location Eschborn, Germany              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Nov. 05, 1999              
Business Sell display products              
Capital stocks | €             € 1  
LG Display Taiwan Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location Taipei, Taiwan              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Apr. 12, 1999              
Business Sell display products              
Capital stocks | $           $ 116    
LG Display Nanjing Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location Nanjing, China              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Jul. 15, 2002              
Business Manufacture display products              
Capital stocks         ¥ 3,020.0      
LG Display Shanghai Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location Shanghai, China              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Jan. 16, 2003              
Business Sell display products              
Capital stocks         4.0      
LG Display Poland Sp. z o.o. [member]                
Disclosure of subsidiaries [line items]                
Location [2] Wroclaw, Poland              
Percentage of ownership [2] 100.00%              
Fiscal year end [2] --12-31              
Date of incorporation [2] Sep. 06, 2005              
Business [2] Manufacture display products              
Capital stocks | zł [2]               zł 511
LG Display Guangzhou Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location Guangzhou, China              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Jun. 30, 2006              
Business Manufacture display products              
Capital stocks         1,655.0      
LG Display Shenzhen Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location Shenzhen, China              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Aug. 28, 2007              
Business Sell display products              
Capital stocks         4.0      
LG Display Singapore Pte. Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location Singapore              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Jan. 12, 2009              
Business Sell display products              
Capital stocks | $     1.1          
L&T Display Technology (Fujian) Limited [member]                
Disclosure of subsidiaries [line items]                
Location Fujian, China              
Percentage of ownership 51.00%              
Fiscal year end --12-31              
Date of incorporation Jan. 05, 2010              
Business Manufacture and sell LCD module and LCD monitor sets              
Capital stocks         116.0      
LG Display Yantai Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location Yantai, China              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Apr. 19, 2010              
Business Manufacture display products              
Capital stocks         1,008.0      
Nanumnuri Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location Gumi, South Korea              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Mar. 21, 2012              
Business Provide janitorial services              
Capital stocks | ₩ ₩ 800              
LG Display (China) Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location Guangzhou, China              
Percentage of ownership 70.00%              
Fiscal year end --12-31              
Date of incorporation Dec. 10, 2012              
Business Manufacture and sell display products              
Capital stocks         8,232.0      
Unified Innovative Technology, LLC [member]                
Disclosure of subsidiaries [line items]                
Location Wilmington, U.S.A.              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Mar. 12, 2014              
Business Manage intellectual property              
Capital stocks | $     9.0          
LG Display Guangzhou Trading Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location Guangzhou, China              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Apr. 28, 2015              
Business Sell display products              
Capital stocks         1.2      
Global OLED Technology, LLC [member]                
Disclosure of subsidiaries [line items]                
Location Sterling, U.S.A.              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Dec. 18, 2009              
Business Manage OLED intellectual property              
Capital stocks | $     138.0          
LG Display Vietnam Haiphong Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location [3] Haiphong Vietnam              
Percentage of ownership [3] 100.00%              
Fiscal year end [3] --12-31              
Date of incorporation [3] May 05, 2016              
Business [3] Manufacture display products              
Capital stocks | $ [3]     600.0          
Suzhou Lehui Display Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location Suzhou, China              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Date of incorporation Jul. 01, 2016              
Business Manufacture and sell LCD module and LCD monitor sets              
Capital stocks         637.0      
LG DISPLAY FUND I LLC [member]                
Disclosure of subsidiaries [line items]                
Location [4] Wilmington, U.S.A.              
Percentage of ownership [4] 100.00%              
Fiscal year end [4] --12-31              
Date of incorporation [4] May 01, 2018              
Business [4] Invest in venture business and obtain technologies              
Capital stocks | $ [4]     $ 6.0          
LG Display High-Tech (China) Co., Ltd. [member]                
Disclosure of subsidiaries [line items]                
Location [1] Guangzhou, China              
Percentage of ownership 75.00% [1] 69.00%            
Fiscal year end [1] --12-31              
Business [1] Manufacture and sell display products              
Capital stocks [1]         ¥ 14,570.0      
Money market trust [member]                
Disclosure of subsidiaries [line items]                
Location Seoul, South Korea              
Percentage of ownership 100.00%              
Fiscal year end --12-31              
Business Money market trust              
Capital stocks | ₩ ₩ 34,700              
[1] For the year ended December 31, 2019, the Controlling Company contributed W1,045,393 million in cash for the capital increase of LG Display High-Tech (China) Co., Ltd. (“LGDCO”). Meanwhile, additional contribution from LG Display Guangzhou Co., Ltd. and non-controlling interest amounted to W32,329 million and W276,396 million, respectively. The Group’s ownership percentage in LGDCO increased from 69% to 75% as a result of these additional investments.
[2] On July 1, 2019, LG Display Poland Sp. z o.o. commenced the liquidation process.
[3] For the year ended December 31, 2019, the Controlling Company contributed W342,680 million in cash for the capital increase of LG Display Vietnam Haiphong Co., Ltd. (“LGDVN”).
[4] For the year ended December 31, 2019, the Controlling Company contributed W4,073 million in cash for the capital increase of LG DISPLAY FUND I LLC.