LG Display (LPL) 20-F 30 Apr 19 2018 FY Annual report (foreign) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2018shares
Document and entity information [abstract]
Document Type	20-F
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	LPL
Entity Registrant Name	LG Display Co., Ltd.
Entity Central Index Key	0001290109
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	357,815,700

Consolidated Statements of Fina

Consolidated Statements of Financial Position - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	₩ 2,365,022	₩ 2,602,560
Deposits in banks	78,400	758,078
Trade accounts and notes receivable, net	2,829,163	4,325,120
Other accounts receivable, net	169,313	164,827
Other current financial assets	46,301	27,252
Inventories	2,691,203	2,350,084
Prepaid income taxes	4,516	3,854
Non-current assets held for sale	70,161
Other current assets	546,048	241,928
Total current assets	8,800,127	10,473,703
Deposits in banks	11	11
Investments in equity accounted investees	113,989	122,507
Other non-current accounts receivable, net	11,448	8,738
Other non-current financial assets	144,214	59,836
Property, plant and equipment, net	21,600,130	16,201,960
Intangible assets, net	987,642	912,821
Deferred tax assets	1,136,166	985,352
Other non-current assets	381,983	394,759
Total non-current assets	24,375,583	18,685,984
Total assets	33,175,710	29,159,687
Liabilities
Trade accounts and notes payable	3,087,461	2,875,090
Current financial liabilities	1,553,907	1,452,926
Other accounts payable	3,566,629	3,169,937
Accrued expenses	633,346	812,615
Income tax payable	105,900	321,978
Provisions	98,254	76,016
Advances received	834,010	194,129
Other current liabilities	74,976	75,991
Total current liabilities	9,954,483	8,978,682
Non-current financial liabilities	7,030,628	4,150,192
Non-current provisions	32,764	28,312
Defined benefit liabilities, net	45,360	95,447
Long-term advances received	1,114,316	830,335
Deferred tax liabilities	15,087	24,646
Other non-current liabilities	96,826	70,563
Total non-current liabilities	8,334,981	5,199,495
Total liabilities	18,289,464	14,178,177
Equity
Share capital	1,789,079	1,789,079
Share premium	2,251,113	2,251,113
Retained earnings	10,239,965	10,621,571
Reserves	(300,968)	(288,280)
Total equity attributable to equity holders of the Controlling Company	13,979,189	14,373,483
Non-controlling interests	907,057	608,027
Total equity	14,886,246	14,981,510
Total liabilities and equity	₩ 33,175,710	₩ 29,159,687

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of comprehensive income [abstract]
Revenue	₩ 24,336,571	₩ 27,790,216	₩ 26,504,074
Cost of sales	(21,251,305)	(22,424,661)	(22,754,270)
Gross profit	3,085,266	5,365,555	3,749,804
Selling expenses	(834,062)	(994,483)	(694,914)
Administrative expenses	(938,214)	(696,022)	(610,479)
Research and development expenses	(1,221,198)	(1,213,432)	(1,133,972)
Other income	1,004,137	1,081,746	1,591,801
Other expenses	(1,115,233)	(1,230,455)	(1,467,831)
Finance income	254,131	279,019	139,671
Finance costs	(326,893)	(268,856)	(266,186)
Equity in income of equity accounted investees, net	700	9,560	8,339
Profit (loss) before income tax	(91,366)	2,332,632	1,316,233
Income tax expense	(88,077)	(395,580)	(384,725)
Profit (loss) for the year	(179,443)	1,937,052	931,508
Other comprehensive income (loss) Items that will never be reclassified to profit or loss
Remeasurements of net defined benefit liabilities	5,690	(16,260)	155,346
Other comprehensive income (loss) from associates and joint ventures	20	441	200
Income tax	(1,169)	9,259	(37,594)
Items that will never be reclassified to profit or loss	4,541	(6,560)	117,952
Other comprehensive income (loss), Items that are or may be reclassified to profit or loss
Net change in fair value of available-for-sale financial assets			(77)
Foreign currency translation differences for foreign operations	(19,987)	(231,738)	(90,503)
Other comprehensive income (loss) from associates and joint ventures	37	905	(5,416)
Related income tax			19
Items that are or may be reclassified to profit or loss	(19,950)	(230,833)	(95,977)
Other comprehensive income (loss) for the year, net of income tax	(15,409)	(237,393)	21,975
Total comprehensive income (loss) for the year	(194,852)	1,699,659	953,483
Profit (loss) attributable to:
Owners of the Controlling Company	(207,239)	1,802,756	906,713
Non-controlling interests	27,796	134,296	24,795
Profit (loss) for the year	(179,443)	1,937,052	931,508
Total comprehensive income (loss) attributable to:
Owners of the Controlling Company	(215,386)	1,596,394	941,953
Non-controlling interests	20,534	103,265	11,530
Total comprehensive income (loss) for the year	₩ (194,852)	₩ 1,699,659	₩ 953,483
Earnings (loss) per share (In won)
Basic earnings (loss) per share	₩ (579)	₩ 5,038	₩ 2,534
Diluted earnings (loss) per share	₩ (579)	₩ 5,038	₩ 2,534

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - KRW (₩) ₩ in Millions	Total	Share capital [Member]	Share premium [member]	Retained earnings [member]	Reserves [Member]	Attributable to owners of the Controlling Company [Member]	Non-controlling interests [member]
Beginning Balance at Dec. 31, 2015	₩ 12,704,956	₩ 1,789,079	₩ 2,251,113	₩ 8,158,526	₩ (5,766)	₩ 12,192,952	₩ 512,004
Total comprehensive income (loss) for the year
Profit (loss) for the year	931,508			906,713		906,713	24,795
Other comprehensive income (loss)
Other comprehensive income (loss)	21,975			117,952	(82,712)	35,240	(13,265)
Total comprehensive income (loss) for the year	953,483			1,024,665	(82,712)	941,953	11,530
Dividends to equity holders	(178,908)			(178,908)		(178,908)
Capital contribution from non-controlling interests	(17,143)						(17,143)
Ending Balance at Dec. 31, 2016	13,462,388	1,789,079	2,251,113	9,004,283	(88,478)	12,955,997	506,391
Total comprehensive income (loss) for the year
Profit (loss) for the year	1,937,052			1,802,756		1,802,756	134,296
Other comprehensive income (loss)
Other comprehensive income (loss)	(237,393)			(6,560)	(199,802)	(206,362)	(31,031)
Total comprehensive income (loss) for the year	1,699,659			1,796,196	(199,802)	1,596,394	103,265
Dividends to equity holders	(178,908)			(178,908)		(178,908)
Subsidiaries' dividends distributed to non-controlling interests	(5,929)						(5,929)
Capital contribution from non-controlling interests	4,300						4,300
Ending Balance at Dec. 31, 2017	14,981,510	1,789,079	2,251,113	10,621,571	(288,280)	14,373,483	608,027
Total comprehensive income (loss) for the year
Profit (loss) for the year	(179,443)			(207,239)		(207,239)	27,796
Other comprehensive income (loss)
Other comprehensive income (loss)	(15,409)			4,541	(12,688)	(8,147)	(7,262)
Total comprehensive income (loss) for the year	(194,852)			(202,698)	(12,688)	(215,386)	20,534
Dividends to equity holders	(178,908)			(178,908)		(178,908)
Subsidiaries' dividends distributed to non-controlling interests	(53,107)						(53,107)
Capital contribution from non-controlling interests	331,603						331,603
Ending Balance at Dec. 31, 2018	₩ 14,886,246	₩ 1,789,079	₩ 2,251,113	₩ 10,239,965	₩ (300,968)	₩ 13,979,189	₩ 907,057

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Profit (loss) for the year	₩ (179,443)	₩ 1,937,052	₩ 931,508
Adjustments for:
Income tax expense	88,077	395,580	384,725
Depreciation	3,123,659	2,791,883	2,643,445
Amortization of intangible assets	430,906	422,693	378,126
Gain on foreign currency translation	(84,643)	(187,558)	(250,508)
Loss on foreign currency translation	138,452	174,919	161,897
Expenses related to defined benefit plans	179,880	198,241	220,962
Gain on disposal of property, plant and equipment	(6,620)	(101,227)	(14,637)
Loss on disposal of property, plant and equipment	15,048	20,030	7,466
Impairment loss on property, plant and equipment	43,601		1,610
Impairment loss on inventories	313,180	206,127	204,123
(Reversal of) bad debt expense	(1,155)	144	(19)
Gain on disposal of intangible assets	(239)	(308)
Loss on disposal of intangible assets		30	75
Impairment loss on intangible assets	82	1,809	138
Reversal of impairment loss on intangible assets	(348)	(35)
Warranty expenses	234,928	251,131	166,691
Finance income	(101,313)	(202,591)	(58,748)
Finance costs	173,975	142,591	187,931
Equity in income of equity method accounted investees, net	(700)	(9,560)	(8,339)
Other income	(3,310)	(16,812)	(15,546)
Other expenses	593	1,870	15,777
Adjustments for reconcile of profit and loss	4,364,610	6,026,009	4,956,677
Changes in Trade accounts and notes receivable	1,306,118	484,448	(553,756)
Other accounts receivable	(56,870)	(3,004)	62,981
Inventories	(763,081)	(262,106)	(98,435)
Other current assets	(249,968)	180,844	126,616
Other non-current assets	(61,164)	(119,002)	(126,256)
Trade accounts and notes payable	267,358	113,590	(114,977)
Other accounts payable	(111,053)	106,930	66,930
Accrued expenses	(194,394)	181,509	(16,431)
Provisions	(217,984)	(210,973)	(160,462)
Other current liabilities	78,849	(585)	17,272
Defined benefit liabilities, net	(224,335)	(261,966)	(276,459)
Long-term advances received	948,276	1,020,470
Other non-current liabilities	24,510	5,974	21,641
Cash generated from operating activities	5,110,872	7,262,138	3,905,341
Income taxes paid	(486,549)	(416,794)	(187,816)
Interests received	71,819	55,340	48,911
Interests paid	(212,019)	(136,483)	(125,530)
Net cash provided by operating activities	4,484,123	6,764,201	3,640,906
Cash flows from investing activities:
Dividends received	5,272	8,639	59,820
Proceeds from withdrawal of deposits in banks	1,454,561	2,206,148	3,293,398
Increase in deposits in banks	(775,239)	(1,803,718)	(2,684,810)
Acquisition of financial assets at fair value through profit or loss	(431)		(1,500)
Proceeds from disposal of financial assets at fair value through other comprehensive income	6
Acquisition of available-for-sale financial assets		(273)	(859)
Proceeds from disposal of available-for-sale financial assets		917	507
Acquisition of investments in equity accounted investees	(14,732)	(20,309)
Proceeds from disposal of investments in equity accounted investees	4,527	13,128	29,745
Acquisition of property, plant and equipment	(7,942,210)	(6,592,435)	(3,735,948)
Proceeds from disposal of property, plant and equipment	142,088	160,252	278,067
Acquisition of intangible assets	(480,607)	(454,448)	(405,167)
Proceeds from disposal of intangible assets	960	1,674	261
Government grants received	1,210	1,859	6,393
Receipt from settlement of derivatives	2,026	2,592	4,008
Increase in short-term loans	(7,700)		(2,132)
Proceeds from collection of short-term loans	15,968	1,118	8,202
Increase in long-term loans	(36,580)	(13,930)	(32,498)
Decrease in deposits	4,136	4,272	2,436
Increase in deposits	(58,794)	(2,648)	(9,105)
Proceeds from disposal of emission rights	10,200	6,090
Net cash used in investing activities	(7,675,339)	(6,481,072)	(3,189,182)
Cash flows from financing activities:
Proceeds from short-term borrowings	552,164		107,345
Repayments of short-term borrowings	(552,884)	(105,864)
Proceeds from issuance of bonds	828,169	497,959	597,573
Proceeds from long-term borrowings	3,882,958	1,195,415	1,667,060
Repayments of long-term borrowings			(347,693)
Repayments of current portion of long-term borrowings and bonds	(1,859,098)	(544,731)	(1,520,287)
Capital contribution from non-controlling interests	331,603	4,300
Subsidiaries' dividends distributed to non-controlling interests	(51,085)	(5,929)	(17,143)
Dividends paid	(178,908)	(178,908)	(178,908)
Net cash provided by financing activities	2,952,919	862,242	307,947
Net increase (decrease) in cash and cash equivalents	(238,297)	1,145,371	759,671
Beginning Balance	2,602,560	1,558,696	751,662
Effect of exchange rate fluctuations on cash held	759	(101,507)	47,363
Ending Balance	₩ 2,365,022	₩ 2,602,560	₩ 1,558,696

Reporting Entity

Reporting Entity	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Reporting Entity	1. Reporting Entity (a) Description of the Controlling Company LG Display Co., Ltd. (the “Controlling Company”) was incorporated in February 1985 and the Controlling Company is a public corporation listed in the Korea Exchange since 2004. The main business of the Controlling Company and its subsidiaries (the “Group”) is to manufacture and sell displays and its related products. As of December 31, 2018, the Group is operating Thin Film Transistor Liquid Crystal Display (“TFT-LCD”) TFT-LCD Yeouidae-ro, Yeongdeungpo-gu, The Controlling Company’s common stock is listed on the Korea Exchange under the identifying code 034220. As of December 31, 2018, there are 357,815,700 shares of common stock outstanding. The Controlling Company’s common stock is also listed on the New York Stock Exchange in the form of American Depository Shares (“ADSs”) under the symbol “LPL”. One ADS represents one-half (b) Consolidated Subsidiaries as of December 31, 2018 (In millions) Subsidiaries Location Percentage Fiscal year end Date of Business Capital stocks LG Display America, Inc. San Jose, U.S.A. 100% December 31 September 24, 1999 Sell Display products USD 411 LG Display Germany GmbH Eschborn, Germany 100% December 31 November 5, 1999 Sell Display products EUR 1 LG Display Japan Co., Ltd. Tokyo, Japan 100% December 31 October 12, 1999 Sell Display products JPY 95 LG Display Taiwan Co., Ltd. Taipei, Taiwan 100% December 31 April 12, 1999 Sell Display products NTD 116 LG Display Nanjing Co., Ltd. Nanjing, China 100% December 31 July 15, 2002 Manufacture Display products CNY 3,020 LG Display Shanghai Co., Ltd. Shanghai, China 100% December 31 January 16, 2003 Sell Display products CNY 4 LG Display Poland Sp. z o.o. Wroclaw, Poland 100% December 31 September 6, 2005 Manufacture Display products PLN 511 LG Display Guangzhou Co., Ltd. Guangzhou, China 100% December 31 June 30, 2006 Manufacture Display products CNY 1,655 LG Display Shenzhen Co., Ltd. Shenzhen, China 100% December 31 August 28, 2007 Sell Display products CNY 4 LG Display Singapore Pte. Ltd. Singapore 100% December 31 January 12, 2009 Sell Display products USD 1.1 L&T Display Technology (Fujian) Limited Fujian, China 51% December 31 January 5, 2010 Manufacture and sell LCD module and LCD monitor sets CNY 116 LG Display Yantai Co., Ltd. Yantai, China 100% December 31 April 19, 2010 Manufacture Display products CNY 1,008 Nanumnuri Co., Ltd. Gumi, South Korea 100% December 31 March 21, 2012 Janitorial services KRW 800 LG Display (China) Co., Ltd. Guangzhou, China 70% December 31 December 10, 2012 Manufacture and sell Display products CNY 8,232 Unified Innovative Technology, LLC Wilmington, U.S.A. 100% December 31 March 12, 2014 Manage intellectual property USD 9 LG Display Guangzhou Trading Co., Ltd. Guangzhou, China 100% December 31 April 28, 2015 Sell Display products CNY 1.2 Global OLED Technology, LLC Herndon, U.S.A. 100% December 31 December 18, 2009 Manage OLED intellectual property USD 138 LG Display Vietnam Haiphong Co., Ltd.(*1) Haiphong Vietnam 100% December 31 May 5, 2016 Manufacture Display products USD 300 Suzhou Lehui Display Co., Ltd. Suzhou, China 100% December 31 July 1, 2016 Manufacture and sell LCD module and LCD monitor sets CNY 637 LG DISPLAY FUND I LLC(*2) Wilmington, U.S.A. 100% December 31 May 1, 2018 Invest in venture business and obtain technologies USD 2 LG Display High-Tech (China) Co., Ltd.(*3) Guangzhou, China 69% December 31 July 11, 2018 Manufacture Display products CNY 6,517 Money Market Trust(*4) Seoul, South Korea 100% December 31 — Money market trust KRW 24,501 (*1) For the year ended December 31, 2018, the Controlling Company contributed W (*2) For the year ended December 31, 2018, the Controlling Company established LG DISPLAY FUND I LLC in Wilmington, U.S.A. to invest in venture business and the Controlling Company has a 100% equity interest of this subsidiary. (*3) For the year ended December 31, 2018, the Controlling Company established LG Display High-Tech (China) Co., Ltd. in Guangzhou China to manufacture Display products and the Group has a 69% equity interest of this subsidiary. (*4) For the year ended December 31, 2018, the Controlling Company acquired and disposed interests in Money Market Trust (“MMT”) and the MMT amount as of December 31, 2018 is W W W W

Basis of Presenting Financial S

Basis of Presenting Financial Statements	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Basis of Presenting Financial Statements	2. Basis of Presenting Financial Statements (a) Statement of Compliance These consolidated financial statements have been prepared in accordance with International Financial Reporting Standards (“IFRSs”) as issued by the International Accounting Standards Board. The consolidated financial statements were authorized for issuance by the Board of Directors on January 29, 2019. (b) Basis of Measurement The consolidated financial statements have been prepared on the historical cost basis except for the following material items in the consolidated statements of financial position: • derivative financial instruments at fair value, financial assets at fair value through profit or loss (“FVTPL”) and financial asset at fair value through other comprehensive income (“FVOCI”), and • net defined benefit liabilities are recognized as the present value of defined benefit obligations less the fair value of plan assets (c) Functional and Presentation Currency The consolidated financial statements are presented in Korean won, which is the Controlling Company’s functional currency. (d) Use of Estimates and Judgments The preparation of the consolidated financial statements in conformity with IFRSs requires management to make judgments, estimates and assumptions that affect the application of accounting policies and the reported amounts of assets, liabilities, income and expenses. Actual results may differ from these estimates. Estimates and underlying assumptions are reviewed on an ongoing basis. Revisions to accounting estimates are recognized in the period in which the estimates are revised and in any future periods affected. Information about critical judgments in applying accounting policies that have the most significant effect on the amounts recognized in the consolidated financial statements is included in the following notes: • Financial instruments (note 3(f)) Information about assumptions and estimation uncertainties that have a significant risk of resulting in a material adjustment within the next 12 months is included in the following notes: • Recognition and measurement of provisions (note 3(l) and13) • Measurement of defined benefit obligations (note 12) • Deferred tax assets (note 24)

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Significant Accounting Policies	3. Summary of Significant Accounting Policies The significant accounting policies followed by the Group in the preparation of its consolidated financial statements are as follows: (a) Changes in Accounting Policies The Group has initially adopted IFRS 9, Financial Instruments, Revenue from Contracts with Customers Foreign Currency Transactions and Advance Consideration The Group has consistently applied the accounting policies to the consolidated financial statements for 2018 and 2017 except for the new amendments effective for annual period beginning January 1, 2018 as mentioned below. (i) IFRS 9, Financial Instruments IFRS 9 set out requirements for recognizing and measuring financial assets, financial liabilities and some contracts to buy or sell non-financial Financial Instruments: Recognition and Measurement Financial Instruments The followings describe the nature and impact on the significant changes in accounting policies from the adoption of IFRS 9. There is no impact on the opening balance of retained earnings at January 1, 2018 resulting from the initial adoption of IFRS 9. Classification and measurement of financial assets and financial liabilities IFRS 9 contains three principal classification categories for financial assets measured at: amortized cost, FVOCI and FVTPL. The classification of financial assets under IFRS 9 is generally based on the business model in which a financial asset is managed and its contractual cash flow characteristics. IFRS 9 eliminates the previous IAS 39 categories of held to maturity, loans and receivables and available for sale. IFRS 9 largely retains the existing requirements in IAS 39 for the classification and measurement of financial liabilities. The adoption IFRS 9 has not had a significant effect on the Group’s accounting policies related to financial liabilities and derivative financial instruments. The following table below explains the original measurement categories under IAS 39 and the changes in measurement categories under IFRS 9 for each class of the Group’s financial assets as at January 1, 2018. ( In millions of won ) Classification under IAS 39 Classification IFRS 9 Carrying amount IAS 39 Carrying amount IFRS 9 Difference Financial assets Cash and cash equivalents Loans and receivables Amortized cost W 2,602,560 2,602,560 — Deposits Loans and receivables Amortized cost 758,089 758,089 — Trade receivables Loans and receivables Amortized cost 4,325,120 4,325,120 — Other receivables Loans and receivables Amortized cost 173,565 173,565 — Debt instrument Available-for-sale FVOCI-debt 162 162 — Equity instrument Available-for-sale Mandatorily at FVTPL 4,980 4,980 — Convertible bonds Designated as at Mandatorily at 1,552 1,552 — Derivatives Designated as at Mandatorily at 842 842 — Others Loans and receivables Amortized cost 79,552 79,552 — Total financial assets W 7,946,422 7,946,422 — As of January 1, 2018, there was no financial liabilities measured at FVTPL. Impairment of financial assets IFRS 9 replaces the ‘incurred loss’ model in IAS 39 with an ‘expected credit loss’ (ECL) model. The new impairment model applies to financial assets measured at amortized cost, contract assets and debt investments at FVOCI, but not to investments in equity instruments. Under IFRS 9, credit losses are recognized earlier than under IAS 39. As a result of applying the new impairment model under IFRS 9, as of January 1, 2018, there is no additional allowance for impairments recognized as compared with the impairment model under IAS 39. Hedge Accounting When initially applying IFRS 9, the Group has elected as its accounting policy to continue to apply hedge accounting requirements under IAS 39 and as a result, there is no impact of applying IFRS 9 on the consolidated financial statements as at January 1, 2018. (ii) IFRS 15, Revenue from Contracts with Customers IFRS 15, Revenue from contracts with customers Revenue Construction Contracts SIC-31, Revenue: Barter Transactions Involving Advertising Services Customer Loyalty Programmes Agreements for the Construction of Real Estate Transfers of Assets from Customers The Group has initially adopted IFRS 15, Revenue from contracts with customers W The effect of the application of IFRS 15 on the Group’s consolidated statement of financial position as of December 31, 2018 is as follows. There is no significant impact on the consolidated statement of comprehensive income and the cash flows for the year ended December 31, 2018. (In millions of won) Categories As reported Adjustments Amounts without Current Assets Other current assets W 546,048 (7,489 ) 538,559 Current Liabilities Provisions W 98,254 (7,489 ) 90,765 (iii) IFRIC 22, Foreign Currency Transactions and Advance Consideration According to the new interpretation, IFRIC 22, Foreign Currency Transactions and Advance Consideration non-monetary non-monetary (b) Consolidation (i) Business combinations The Group accounts for business combinations using the acquisition method when control is transferred to the Group. The consideration transferred in the acquisition is generally measured at fair value, as are the identifiable net assets acquired. Any goodwill that arises is tested annually for impairment. Any gain on a bargain purchase is recognized in profit or loss immediately. Transaction costs are expensed as incurred, except if related to the issue of debt or equity securities in accordance with IAS 32 and IFRS 9. The consideration transferred does not include amounts related to the settlement of pre-existing (ii) Subsidiaries Subsidiaries are entities controlled by the Group. The Group controls an entity when it is exposed, or has right to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. The financial statements of subsidiaries are included in the consolidated financial statements from the date on which control commences until the date on which control ceases. (iii) Non-controlling interests Non-controlling Changes in the Group’s interest in subsidiaries that do not result in a loss of control are accounted for as equity transactions. (iv) Loss of control If the Controlling Company loses control of subsidiaries, the Controlling Company derecognizes the assets and liabilities of the former subsidiaries from the consolidated statement of financial position and recognizes the gain or loss associated with the loss of control attributable to the former controlling interest. Meanwhile, the Controlling Company recognizes any investment retained in the former subsidiaries at its fair value when control is lost. (v) Associates and joint ventures (equity method investees) Associates are those entities in which the Group has significant influence, but not control or joint control, over the financial and operating policies. A joint venture is an arrangement in which the Group has joint control, whereby the Group has rights to the net assets of the arrangement, rather than rights to its assets and obligations for its liabilities. Investments in associates and joint ventures are initially recognized at cost and subsequently accounted for using the equity method of accounting. The carrying amount of investments in associates and joint ventures is increased or decreased to recognize the Group’s share of the profits or losses and changes in the Group’s proportionate interest of the investee after the date of acquisition. Distributions received from an investee reduce the carrying amount of the investment. If an associate or joint ventures uses accounting policies different from those of the Controlling Company for like transactions and events in similar circumstances, appropriate adjustments are made to the consolidated financial statements. As of and during the periods presented in the consolidated financial statements, no adjustments were made in applying the equity method. When the Group’s share of losses exceeds its interest in an equity accounted investee, the carrying amount of that interest, including any long-term investments, is reduced to nil, and the recognition of further losses is discontinued except to the extent that the Group has an obligation or has made payments on behalf of the investee. (vi) Transactions eliminated on consolidation Intra-group balances and transactions, including income and expenses and any unrealized income and expenses and balance of trade accounts and notes receivable and payable arising from intra-group transactions, are eliminated. Unrealized gains arising from transactions with equity-accounted investees are eliminated against the investment to the extent of the Group’s interest in the investee. Unrealized losses are eliminated in the same way as unrealized gains, but only to the extent that there is no evidence of impairment. (c) Foreign Currency Transaction and Translation Transactions in foreign currencies are translated to the respective functional currencies of the Group at exchange rates at the dates of the transactions. Monetary assets and liabilities denominated in foreign currencies are retranslated to the functional currency at the exchange rate on the reporting date. Non-monetary Non-monetary non-operating If the presentation currency of the Group is different from a foreign operation’s functional currency, the financial position and financial performance of the foreign operation are translated into the presentation currency using the following methods. The assets and liabilities of foreign operations, whose functional currency is not the currency of a hyperinflationary economy, including goodwill and fair value adjustments arising on acquisition, are translated to the Group’s functional currency at exchange rates at the reporting date. The income and expenses of foreign operations are translated to the Group’s functional currency at exchange rates at the dates of the transactions. Foreign currency differences are recognized in other comprehensive income. However, if the operation is a non-wholly-owned non-controlling Any goodwill arising on the acquisition of a foreign operation and any fair value adjustments to the carrying amounts of assets and liabilities arising on the acquisition of that foreign operation is treated as assets and liabilities of the foreign operation. Thus, they are expressed in the functional currency of the foreign operation and translated at the at each reporting date’s exchange rate. (d) Cash and Cash Equivalents Cash and cash equivalents include all cash balances and short-term highly liquid investments with an original maturity of three months or less that are readily convertible into known amounts of cash. (e) Inventories Inventories are measured at the lower of cost and net realizable value. The cost of inventories is based on the weighted-average method, and includes expenditures incurred in acquiring the inventories, production or conversion costs and other costs incurred in bringing them to their existing location and condition. Net realizable value is the estimated selling price in the ordinary course of business less the estimated costs of completion and the estimated selling expenses. In the case of manufactured inventories and work-in-process, cost includes an appropriate share of production overheads based on the actual capacity of production facilities. However, the normal capacity is used for the allocation of fixed production overheads if the actual level of production is lower than the normal capacity. (f) Financial Instruments (i) Non-derivative Recognition and initial measurement Trade receivables and debt securities issued are initially recognized when they are originated. All other financial assets or liabilities are recognized in statement of financial position when, and only when, the Group becomes a party to the contractual provisions of the instrument. A financial asset (unless it is a trade receivable without a significant financing component) or financial liability is initially measured at fair value plus, for an item not at FVTPL, transaction costs that are directly attributable to its acquisition or issue. A trade receivable without a significant financing component is initially measured at the transaction price. Classification and subsequent measurement i) Financial assets: Policy applicable from January 1, 2018 On initial recognition, a financial asset is classified as measured at: amortized cost; FVOCI – debt investment; FVOCI – equity investments; or FVTPL. Financial assets are not reclassified subsequent to their initial recognition unless the Group changes its business model for managing financial assets, in which case all affected financial assets are reclassified on the first day of the first reporting period following the change in the business model. A financial asset is measured at amortized cost if it meets both of the following conditions and is not designated at FVTPL: • it is held within a business model whose objective is to hold assets to collect contractual cash flows; and • its contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. A debt investment is measured at FVOCI if it meets both of the following conditions and is not designated as at FVTPL: • it is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets; and • the contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. On initial recognition of an equity investments that is not held for trading, the Group may irrevocably elect to present subsequent changes in the investment’s fair value in OCI. This election is made on an investment-by-investment All financial assets not classified as measured at amortized cost or FVOCI as described above are measured at FVTPL. This includes all derivative financial assets. At initial recognition, the Group may irrevocably designate a financial asset that otherwise meets the requirements to be measured at amortized cost or at FVOCI as at FVTPL if doing so eliminates or significantly reduces an accounting mismatch that would otherwise arise. ii) Financial assets: business model: Policy applicable from January 1, 2018 The Group makes an assessment of the objective of the business model in which a financial asset is held at a portfolio level because this best reflects the way the business is managed and information is provided to management. The information considered includes: • the stated policies and objectives for the portfolio and the operation of those policies in practice. These include whether management’s strategy focuses on earning contractual interest income, maintaining a particular interest rate profile, matching the duration of the financial assets to the duration of any related liabilities or expected cash outflows or realizing cash flows through the sale of the assets; • how the performance of the portfolio is evaluated and reported to the Group’s management; • the risks that affect the performance of the business model (and the financial assets held within that business model) and how those risks are managed; • how managers of the business are compensated – e.g. whether compensation is based on the fair value of the assets managed or the contractual cash flows collected; and • the frequency, volume and timing of sales of financial assets in prior periods, the reasons for such sales and expectations about future sales activity. Transfers of financial asset to third parties in transaction that do not qualify for derecognition are not considered sale for this purpose. A financial assets that are held for trading or are managed and whose performance is evaluated on a fair value basis are measured at FVTPL. iii) Financial assets: Assessment whether contractual cash flows are solely payments of principal and interest: Policy applicable from January 1, 2018 For the purpose of this assessment, “principal” is defined as the fair value of the financial asset on initial recognition. ‘Interest’ is defined as consideration for the time value of money and for the credit risk associated with the principal amount outstanding during a particular period of time and for other basic lending risks and cost (e.g. liquidity risk and administrative costs), as well as profit margin. In assessing whether the contractual cash flows are solely payments of principal and interest, the Group considers the contractual terms of the instrument. This includes assessing whether the financial asset contains a contractual term that could change the timing or amount of contractual cash flows such that it would not meet this condition. In making this assessment, the Group considers. • contingent events that would change the amount or timing of cash flows: • terms that may adjust the contractual coupon rate, including variable-rate features; • prepayment and extension features; and • terms that limit the Group’s claim to cash flows from specified assets (e.g. non-recourse A prepayment feature is consistent with the solely payments of principal and interest criterion if the prepayment amount substantially represents unpaid amounts of principal and interest or the principal amount outstanding, which may include reasonable additional compensation for early termination of the contract. Additionally, for a financial asset acquired at a discount or premium to its contractual par amount, a feature that permits or requires prepayment at an amount that substantially represents the contractual par amount plus accrued (but unpaid) contractual interest (which may also include reasonable additional compensation for early termination) is treated as consistent with this criterion if the fair value of the prepayment feature is insignificant at initial recognition. iv) Financial assets: Subsequent measurement and gains and losses: Policy applicable from January 1, 2018 Financial assets at FVTPL These assets are subsequently measured at fair value. Net gains and losses, including any interest or dividend income, are recognized in profit or loss. Financial assets at amortized cost These assets are subsequently measured at amortized cost using the effective interest method. The amortized cost is reduced by impairment losses. Interest income, foreign exchange gains and losses and impairment are recognized in profit or loss. Any gain or loss on derecognition is recognized in profit or loss. Debt investments at FVOCI These assets are subsequently measured at fair value. Interest income calculated using the effective interest method, foreign exchange gains and losses and impairment are recognized in profit or loss. Other net gains and losses are recognized in OCI. On derecognition, gains and losses accumulated in OCI are reclassified to profit or loss. v) Financial assets: Policy applicable before January 1, 2018 The Group has classified financial assets into one of the following categories • loans and receivables • available-for-sale • at FVTPL vi) Financial assets: subsequent measurement, gains and losses: Policy applicable before January 1, 2018 Financial assets at FVTPL Measured at fair value and changes therein, including any interest or dividend income, were recognized in profit or loss. Loans and receivables Measured at amortized cost using the effective interest method. Available-for-sale Measured at fair value and changes therein, other than impairment losses, interest income and foreign currency differences on debt instruments, were recognized in OCI and accumulated in the fair value reserves. When these assets were derecognized, the gain or loss accumulated in equity was classified to profit or loss. Derecognition The Group derecognizes a financial asset when the contractual rights to the cash flows from the asset expire, it transfers the rights to receive the contractual cash flows of the financial asset in a transaction in which substantially all the risks and rewards of ownership of the financial asset are transferred, or it transfers or does not retain substantially all the risks and rewards of ownership of a transferred asset, and does not retain control of the transferred asset. If the Group has retained substantially all the risks and rewards of ownership of the transferred asset, the Group continue to recognize the transferred asset. Offset Financial assets and liabilities are offset and the net amount presented in the consolidated statement of financial position when, and only when, the Group has a legal right to offset the amounts and intends either to settle them on a net basis or to realize the asset and settle the liability simultaneously. (ii) Non-derivative The Group classifies financial liabilities into two categories, financial liabilities at FVTPL and other financial liabilities, in accordance with the substance of the contractual arrangement and the definitions of financial liabilities, and recognizes them in the consolidated statement of financial position when the Group becomes a party to the contractual provisions of the instrument. Financial liabilities at FVTPL include financial liabilities held for trading or designated as such upon initial recognition at FVTPL. After initial recognition, financial liabilities at FVTPL are measured at fair value, and changes therein are recognized in profit or loss. Upon initial recognition, transaction costs that are directly attributable to the issuance of financial liabilities are recognized in profit or loss as incurred. Non-derivative non-derivative The Group derecognizes a financial liability when its contractual obligations are discharged, cancelled or expired. (iii) Share capital The Group only issued common stocks and they are classified as equity. Incremental costs directly attributable to the issuance of common stocks are recognized as a deduction from equity, net of tax effects. Capital contributed in excess of par value upon issuance of common stocks is classified as share premium within equity. (iv) Derivative financial instruments Derivatives are initially recognized at fair value. Subsequent to initial recognition, derivatives are measured at fair value, and changes therein are accounted for as described below. Hedge accounting If necessary, the Group designates derivatives as hedging items to hedge the risk of changes in the fair value of assets, liabilities or firm commitments (a fair value hedge) and foreign currency risk of highly probable forecasted transactions or firm commitments (a cash flow hedge). On initial designation of the hedge, the Group’s management formally designates and documents the relationship between the hedging instrument(s) and hedged item(s), including the risk management objectives and strategy in undertaking the hedge transaction, together with the methods that will be used to assess the effectiveness of the hedging relationship, both at the inception of the hedge relationship as well as on an ongoing basis. i) Fair value hedges Change in the fair value of a derivative hedging instrument designated as a fair value hedge and the hedged item is recognized in profit or loss, respectively. The gain or loss from remeasuring the hedging instrument at fair value and the gain or loss on the hedged item attributable to the hedged risk are recognized in profit or loss in the same line item of the statement of comprehensive income. The Group discontinues fair value hedge accounting if it does not designate the derivative hedging instrument and the hedged item as the hedge relationship between them anymore or if the hedging instrument expires or is sold, terminated or exercised, or if the hedge no longer meets the criteria for hedge accounting. Any adjustment arising from gain or loss on the hedged item attributable to the hedged risk is amortized to profit or loss from the date the hedge accounting is discontinued. ii) Cash flow hedges When a derivative designated as a cash flow hedging instrument meets the criteria of cash flow hedge accounting, the effective portion of changes in the fair value of the derivative is recognized in other comprehensive income and the ineffective portion of changes in the fair value of the derivative is recognized in profit or loss. The Group discontinues cash flow hedge accounting if it does not designate the derivative hedging instrument and the hedged item as the hedge relationship between them anymore or if the hedging instruments expires or is sold, terminated or exercised, or if the hedge no longer meets the criteria for hedge accounting. The cumulative gain or loss on the hedging instrument that has been recognized in other comprehensive income is reclassified to profit or loss in the periods during which the forecasted transaction occurs. If the forecasted transaction is no longer expected to occur, then the balance in other comprehensive income is recognized immediately in profit or loss. Embedded derivative Embedded derivatives are separated from the host contract and accounted for separately if the host contract is not a financial asset and certain criteria are met. Other derivative financial instruments Derivative financial instruments are measured at fair value and changes of them not designated as a hedging instrument or not effective for hedging are recognized in profit or loss. (g) Property, Plant and Equipment (i) Recognition and measurement Items of property, plant and equipment are measured at cost less accumulated depreciation and accumulated impairment losses. Cost includes an expenditure that is directly attributable to the acquisition of the asset. The cost of self-constructed assets includes the cost of materials and direct labor, any costs directly attributable to bringing the assets to a working condition for their intended use, the costs of dismantling and removing the items and restoring the site on which they are located and borrowing costs on qualifying assets. The gain or loss arising from the derecognition of an item of property, plant and equipment is determined as the difference between the net disposal proceeds, if any, and the carrying amount of the item and recognized in other non-operating non-operating (ii) Subsequent costs Subsequent expenditure on an item of property, plant and equipment is recognized as part of its cost only if it is probable that future economic benefits associated with the item will flow to the Group and the cost of the item can be measured reliably. The costs of the day-to-day (iii) Depreciation Depreciation is recognized in profit or loss on a straight-line basis, reflecting the pattern in which the asset’s future economic benefits are expected to be consumed by the Group. The residual value of property, plant and equipment is zero. Land is not depreciated. Estimated useful lives of the assets are as follows: Useful lives (years) Buildings and structures 20, 40 Machinery 4, 5 Furniture and fixtures 4 Equipment, tools and vehicles 2, 4, 12 Depreciation methods, useful lives and residual values are reviewed at each financial year-end During the year ended December 31, 2018, the Group changed estimated useful lives of the mask and mold which had previously been classified as inventories. Based on the review of the accumulated historical usage information that became available, it is expected that the mask and mold will be used for the period exceeding one year. Accordingly, the Group changed useful lives of Mask and Mold to two years accounted for the change in accounting estimate and reclassified the mask and mold to property, plant and equipment from inventories. As a result of such change, the Group reclassified inventories amounting to W (In millions of won) Description 2018 2019 2020 Increase (decrease) in depreciation expense W (110,373 ) 58,364 52,009 (h) Borrowing Costs The Group capitalizes borrowing costs, which includes interests and exchange differences arising from foreign currency borrowings to the extent that they are regarded as an adjustment to interest costs, directly attributable to the acquisition, construction or production of a qualifying asset as part of the cost of that asset. A qualifying asset is an asset that necessarily takes a substantial period of time to get ready for its intended use or sale. To the extent that the Group borrows funds specifically for the purpose of obtaining a qualifying asset, the Group determines the amount of borrowing costs eligible for capitalization as the actual borrowing costs incurred on that borrowing during the period less any investment income on the temporary investment of those borrowings. The Group immediately recognizes other borrowing costs as an expense. (i) Government Grants In case there is reasonable assurance that the Group will comply with the conditions attached to a government grant, the government grant is recognized as follows: (i) Grants related to the purchase or construction of assets A government grant related to the purchase or construction of assets is deducted in calculating the carrying amount of the asset. The grant is recognized in profit or loss over the life of a depreciable asset as a reduced depreciation expense and cash related to grant received is presented in investing activities in the statement of cash flows. (ii) Grants for compensating the Group’s expenses incurred A government grant that compensates the Group for expenses incurred is recognized in profit or loss as a deduction from relevant expenses on a systematic basis in the periods in which the expenses are recognized. (iii) Other government grants A government grant that becomes receivable for the purpose of giving immediate financial support to the Group with no compensation for expenses or losses already incurred or no future related costs is recognized as income of the period in which it becomes receivable. (j) Intangible Assets Intangible assets are initially measured at cost. Subsequently, intangible assets are measured at cost less accumulated amortization and accumulated impairment losses. (i) Goodwill Goodwill arising from business combinations is recognized as the excess of the acquisition cost of investments in subsidiaries, associates and joint ventures over the Group’s share of the net fair value of the identifiable assets acquired and liabilities assumed. Any deficit is a bargain purchase that is recognized in profit or loss. Goodwill is measured at cost less accumulated impairment losses. (ii) Research and development Expenditure on research activities, undertaken with the prospect of gaining new scientific or technical knowledge and understanding, is recognized in profit or loss as incurred. Development activities involve a plan or design of the production of new or substantially improved products and processes. Development expenditure is capitalized only if the Group can demonstrate all of the following: • the technical feasibility of completing the intangible asset so that it will be available for use or sale, • its intention to complete the intangible asset and use or sell it, • its ability to use or sell the intangible asset, • how the intangible asset will generate probable future economic benefits. Among other things, the Group can demonstrate the existence of a market for the output of the intangible asset or the intangible asset itself or, if it is to be used internally, the usefulness of the intangible asset, • the availability of adequate technical, financial and other resources to complete the development and to use or sell the intangible asset, and • its ability to measure reliably the expenditure attributable to the intangible asset during its development. The expenditure capitalized includes the cost of materials, direct labor, overhead costs that are directly attributable to preparing the asset for its intended use, and borrowing costs on qualifying assets. (iii) Other intangible assets Other intangible assets include intellectual property rights, software, customer relationships, technology, memberships and others. (iv) Subsequent costs Subsequent expenditure is capitalized only when it increases the future economic benefits embodied in the specific intangible asset to which it relates. All other expenditure, including expenditure on internally generated goodwill and brands, is recognized in profit or loss as incurred. (v) Amortization Amortization is calculated on a straight-line basis over the estimated useful lives of intangible assets, other than goodwill, from the date that they are available for use. The residual value of intangible assets is zero. However, as there are no foreseeable limits to the periods over which condominium and

Cash and Cash Equivalents and D

Cash and Cash Equivalents and Deposits in Banks	12 Months Ended
	Dec. 31, 2018
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Cash and Cash Equivalents and Deposits in Banks	4. Cash and Cash Equivalents and Deposits in Banks Cash and cash equivalents and deposits in banks as of December 31, 2017 and December 31, 2018 are as follows: (In millions of won) December 31, 2017 December 31, 2018 Current assets Cash and cash equivalents Demand deposits W 2,602,560 2,365,022 Deposits in banks Time deposits W 685,238 4,318 Restricted cash(*) 72,840 74,082 W 758,078 78,400 Non-current Deposits in banks Restricted cash(*) W 11 11 W 3,360,649 2,443,433 (*) Restricted cash includes mutual growth fund to aid LG Group’s second and third-tier suppliers, pledge to enforce investment plans according to the receipt of subsidies from Gumi city and Gyeongsangbuk- do and others.

Receivables and Other Assets

Receivables and Other Assets	12 Months Ended
	Dec. 31, 2018
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Receivables and Other Assets	5. Receivables and Other Assets (a) Trade accounts and notes receivable as of December 31, 2017 and December 31, 2018 are as follows: ( In millions of won December 31, 2017 December 31, 2018 Trade, net W 3,275,902 2,305,368 Due from related parties 1,049,218 523,795 W 4,325,120 2,829,163 (b) Other accounts receivable as of December 31, 2017 and December 31, 2018 are as follows: (In millions of won) December 31, 2017 December 31, 2018 Current assets Non-trade W 150,554 159,238 Accrued income 14,273 10,075 W 164,827 169,313 Non-current assets Long-term non-trade 8,738 11,448 W 173,565 180,761 Due from related parties included in other accounts receivable, as of December 31, 2017 and 2018 are W W (c) The aging of trade accounts and notes receivable, and other accounts receivable as of December 31, 2017 and December 31, 2018 are as follows: (In millions of won) December 31, 2017 Book value Impairment loss Trade accounts and notes receivable Other accounts receivable Trade accounts and notes receivable Other accounts receivable Not past due W 4,323,465 173,493 (1,631 ) (905 ) Past due 1-15 2,652 488 (1 ) (3 ) Past due 16-30 days 631 65 — (1 ) Past due 31-60 — 208 — (2 ) Past due more than 60 days 4 622 — (400 ) W 4,326,752 174,876 (1,632 ) (1,311 ) (In millions of won) December 31, 2018 Book value Impairment loss Trade accounts and notes receivable Other accounts receivable Trade accounts and notes receivable Other accounts receivable Not past due W 2,807,598 177,689 (473 ) (816 ) Past due 1-15 21,558 3,148 (4 ) (26 ) Past due 16-30 days 454 441 — (4 ) Past due 31-60 30 96 — (1 ) Past due more than 60 days — 668 — (434 ) W 2,829,640 182,042 (477 ) (1,281 ) The movement in the allowance for impairment in respect of trade accounts and notes receivable and other accounts receivable for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) Trade accounts and notes receivable 2016 2017 2018 Balance at the beginning of the year W 1,507 1,488 1,632 (Reversal of) bad debt expense (19 ) 144 (1,155 ) Balance at the end of the year W 1,488 1,632 477 (In millions of won) Other accounts receivable 2016 2017 2018 Balance at the beginning of the year W 618 1,116 1,311 (Reversal of) bad debt expense 498 195 (30 ) Balance at the end of the year W 1,116 1,311 1,281 (d) Other assets as of December 31, 2017 and December 31, 2018 are as follows: (In millions of won) December 31, 2017 December 31, 2018 Current assets Advance payments W 7,973 13,259 Prepaid expenses 83,626 89,110 Value added tax refundable 148,351 436,190 Emission rights 1,978 — Right to recover returned goods(*) — 7,489 W 241,928 546,048 Non-current Long-term prepaid expenses W 394,759 381,983 (*) As a result from the initial application of IFRS 15, the Group recognized an asset for right to recover goods returned by the customer.

Other Financial Assets

Other Financial Assets	12 Months Ended
	Dec. 31, 2018
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Other Financial Assets	6. Other Financial Assets (a) Other financial assets as of December 31, 2017 are as follows: (In millions of won) December 31, 2017 Current assets Available-for-sale Debt instrument Government bonds W 6 Deposits 10,480 Short-term loans 16,766 W 27,252 Non-current Financial asset at fair value through profit or loss W 1,552 Available-for-sale Government bonds W 156 Equity instrument Intellectual Discovery, Ltd. W 729 Kyulux, Inc. 1,968 ARCH Venture Fund Vill, LP. 2,283 W 4,980 Deposits W 19,898 Long-term loans 32,408 Derivatives(*) 842 W 59,836 (*) Represents interest rate swap contracts related to borrowings with variable interest rate. (b) Other financial assets as of December 31, 2018 are as follows: (In millions of won) December 31, 2018 Current assets Financial asset at fair value through profit or loss Derivatives(*) W 13,059 Financial asset at fair value through other comprehensive income Debt instrument Government bonds W 106 Financial asset carried at amortized cost Deposits W 17,020 Short-term loans 16,116 W 46,301 Non-current Financial asset at fair value through profit or loss Equity instrument Intellectual Discovery, Ltd. W 4,598 Kyulux, Inc. 2,460 Fineeva Co., Ltd. 286 ARCH Venture Fund Vill, L.P. 6,337 W 13,681 Convertible bonds W 1,327 Financial asset at fair value through other comprehensive income Debt instrument Government bonds W 55 Financial asset carried at amortized cost Deposits W 74,103 Long-term loans 55,048 W 144,214 (*) Represents exchange rate swap contracts related to foreign currency denominated borrowings and bonds. Other financial assets of related parties as of December 31, 2017 and 2018 are W W

Inventories

Inventories	12 Months Ended
	Dec. 31, 2018
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Inventories	7. Inventories Inventories at the reporting date are as follows: (In millions of won) December 31, 2017 December 31, 2018 Finished goods W 965,643 1,084,297 Work-in-process 748,592 856,388 Raw materials 344,997 554,720 Supplies 290,852 195,798 W 2,350,084 2,691,203 For the years ended December 31, 2016, 2017 and 2018, the amount of inventories recognized as cost of sales and inventory write-downs included in cost of sales are as follows: (In millions of won) 2016 2017 2018 Inventories recognized as cost of sales W 22,754,270 22,424,661 21,251,305 Including: inventory write-downs 204,123 206,127 313,180 There were no significant reversals of inventory write-downs recognized during 2016, 2017 and 2018.

Investments in Equity Accounted

Investments in Equity Accounted Investees	12 Months Ended
	Dec. 31, 2018
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Investments in Equity Accounted Investees	8. Investments in Equity Accounted Investees (a) Associates at the reporting date are as follows: (In millions of won) Associates Location Fiscal year end Date of Business 2017 2018 Percentage Carrying amount Percentage Carrying amount Paju Electric Glass Co., Ltd. Paju, South Korea December 31 January 2005 Manufacture electric glass for FPDs 40% W 40% W INVENIA Co., Ltd. Seongnam, South Korea December 31 January 2001 Develop and manufacture equipment for FPDs 13 2,887 13 4,166 WooRee E&L Co., Ltd.(*1) Ansan, South Korea December 31 June 2008 Manufacture LED back light unit packages 14 7,270 14 4,746 LB Gemini New Growth Fund No. 16(*2) Seoul, South Korea December 31 December 2009 Invest in small and middle sized companies and benefit from M&A opportunities 31 5,910 — — YAS Co., Ltd. Paju, South Korea December 31 April 2002 Develop and manufacture deposition equipment for OLEDs 15 15,888 15 16,308 AVATEC Co., Ltd. Daegu, South Korea December 31 August 2000 Process and sell electric glass for FPDs 17 23,732 17 23,441 Arctic Sentinel, Inc. Los Angeles, U.S.A. March 31 June 2008 Develop and manufacture tablet for kids 10 — 10 — (In millions of won) Associates Location Fiscal year end Date of Business 2017 2018 Percentage of ownership Carrying amount Percentage of Carrying amount CYNORA GmbH(*3) Bruchsal, Germany December 31 March 2003 Develop organic emitting materials for displays and lighting devices 14% W 14% W Material Science Co., Ltd.(*4) Seoul, South Korea December 31 January 2014 Develop, manufacture, and sell materials for display — — 10 3,346 Nanosys Inc.(*5) Milpitas, U.S.A. December 31 July 2001 Develop, manufacture, and sell materials for display — — 4 5,491 W W Although the Controlling Company’s share interests in INVENIA Co., Ltd., WooRee E&L Co., Ltd., YAS Co., Ltd., AVATEC Co., Ltd., Arctic Sentinel, Inc., Cynora GmbH, Material Science Co., Ltd. and Nanosys Inc. are below 20% as of December 31, 2018, the Controlling Company is able to exercise significant influence through its right to appoint a director to the board of directors of each investee. Accordingly, the investments in these investees have been accounted for using the equity method. (*1) The Controlling Company recognized a reversal of impairment loss of W (*2) In 2018, the LB Gemini New Growth Fund No.16 (“the Fund”) which the Controlling Company was a member of a limited partnership, was approved to be dissolve at the general meeting and completed liquidation. In 2018, the Controlling Company received W W (*3) In 2018, the Controlling Company determined investments in CYNORA GmbH irrecoverable and accordingly recognized an impairment loss of W (*4) In March 2018, the Controlling Company invested W W (*5) In May 2018, the Controlling Company invested W W . As of December 31, 2018, the market value for the Controlling Company’s investments in INVENIA Co., Ltd., WooRee E&L Co., Ltd., YAS Co., Ltd., and AVATEC Co., Ltd., all of which are listed in KOSDAQ, are W W W W Dividends received from equity method investees for the years ended December 31, 2016, 2017 and 2018 amounted to W W W (b) Summary of financial information of the significant associate as of December 31, 2017 and 2018 and for the years ended December 31, 2016, 2017 and 2018 are as follows: (i) Paju Electric Glass Co., Ltd. ( In millions of won ) December 31, 2017 December 31, 2018 Total assets W 193,584 194,021 Current assets 146,702 128,788 Non-current 46,882 65,233 Total liabilities 77,174 72,686 Current liabilities 71,973 66,797 Non-current 5,201 5,889 (In millions of won) 2016 2017 2018 Revenue W 549,559 408,846 384,144 Profit for the year 21,082 12,327 12,744 Other comprehensive income (loss) 16,477 (9,366 ) 2,612 Total comprehensive income 37,559 2,961 15,356 (c) Reconciliation from financial information of the significant associate to its carrying value in the consolidated financial statements as of December 31, 2017 and 2018 is as follows: (i) As of December 31, 2017 (In millions of won) Company Net asset Ownership Net asset Goodwill Intra-group Book Paju Electric Glass Co., Ltd. W 116,410 40 % 46,564 — (53 ) 46,511 (ii) As of December 31, 2018 (In millions of won) Company Net asset Ownership Net asset Goodwill Intra-group Book Paju Electric Glass Co., Ltd. W 121,335 40 % 48,534 — (711 ) 47,823 (d) Book value of other associates, in aggregate, as of December 31, 2017 and 2018 is as follows: (i) As of December 31, 2017 (In millions of won) Book value Net profit of associates (applying ownership Profit for Other Total Other associates W 75,996 3,943 5,093 9,036 (ii) As of December 31, 2018 (In millions of won) Book value Net profit (loss) of associates (applying ownership Profit (loss) Other Total Other associates W 66,166 (3,739 ) (988 ) (4,727 ) (e) Changes in investments in associates accounted for using the equity method for the years ended December 31, 2017 and 2018 are as follows: (In millions of won) 2017 Company January 1 Acquisition/ Disposal Dividends Equity income Other Other December 31 Associates Paju Electric Glass Co., Ltd. W 52,750 — (8,109 ) 5,617 (3,747 ) — 46,511 Others 119,933 (48,209 ) (530 ) 3,943 5,093 (4,234 ) 75,996 W 172,683 (48,209 ) (8,639 ) 9,560 1,346 (4,234 ) 122,507 (In millions of won) 2018 Company January 1 Acquisition/ Disposal Dividends Equity income Other Other December 31 Associates Paju Electric Glass Co., Ltd. W 46,511 — (4,172 ) 4,439 1,045 — 47,823 Others 75,996 12,592 (1,100 ) (3,739 ) (988 ) (16,595 ) 66,166 W 122,507 12,592 (5,272 ) 700 57 (16,595 ) 113,989

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2018
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Property, Plant and Equipment	9. Property, Plant and Equipment (a) Changes in property, plant and equipment for the year ended December 31, 2017 are as follows: (In millions of won) Land Buildings Machinery and equipment Furniture and fixtures Construction- in-progress (*1) Others Total Acquisition cost as of January 1, 2017 W 461,484 6,284,778 37,472,177 775,682 2,981,964 202,306 48,178,391 Accumulated depreciation as of January 1, 2017 — (2,397,967 ) (32,947,359 ) (651,424 ) — (146,251 ) (36,143,001 ) Accumulated impairment loss as of January 1, 2017 — (1,651 ) (2,290 ) — — — (3,941 ) Book value as of January 1, 2017 W 461,484 3,885,160 4,522,528 124,258 2,981,964 56,055 12,031,449 Additions — — — — 7,272,476 — 7,272,476 Depreciation — (295,045 ) (2,416,202 ) (66,963 ) — (13,673 ) (2,791,883 ) Disposals (1,042 ) (7,206 ) (75,275 ) (52 ) — (3,133 ) (86,708 ) Others(*2) 69 339,640 3,825,155 87,186 (4,270,210 ) 18,160 — Effect of movements in exchange rates — (63,222 ) (140,306 ) (3,087 ) (14,213 ) (687 ) (221,515 ) Government grants received — (548 ) (3,150 ) — 1,839 — (1,859 ) Book value as of December 31, 2017 W 460,511 3,858,779 5,712,750 141,342 5,971,856 56,722 16,201,960 Acquisition cost as of December 31, 2017 W 460,511 6,539,506 38,901,158 772,824 5,971,856 205,475 52,851,330 Accumulated depreciation as of December 31, 2017 W — (2,678,970 ) (33,186,118 ) (631,482 ) — (148,753 ) (36,645,323 ) Accumulated impairment loss as of December 31, 2017 W — (1,757 ) (2,290 ) — — — (4,047 ) (*1) As of December 31, 2017, construction-in-progress mainly relates to construction of manufacturing facilities. (*2) Others are mainly amounts transferred from construction-in-progress. (b) Changes in property, plant and equipment for the year ended December 31, 2018 are as follows: (In millions of won) Land Buildings Machinery and equipment Furniture and fixtures Construction- in-progress (*1) Others Total Acquisition cost as of January 1, 2018 W 460,511 6,539,506 38,901,158 772,824 5,971,856 205,475 52,851,330 Accumulated depreciation as of January 1, 2018 — (2,678,970 ) (33,186,118 ) (631,482 ) — (148,753 ) (36,645,323 ) Accumulated impairment loss as of January 1, 2018 — (1,757 ) (2,290 ) — — — (4,047 ) Book value as of January 1, 2018 W 460,511 3,858,779 5,712,750 141,342 5,971,856 56,722 16,201,960 Additions — — — — 8,605,551 — 8,605,551 Depreciation — (318,311 ) (2,568,335 ) (67,274 ) — (169,739 ) (3,123,659 ) Disposals (15 ) (161 ) (112,752 ) (311 ) — (2,971 ) (116,210 ) Impairment loss — — (25,711 ) — (17,890 ) — (43,601 ) Others(*2) 1,332 55,430 1,959,645 68,177 (2,357,412 ) 380,278 107,450 Effect of movements in exchange rates — 9,809 14,520 359 15,010 312 40,010 Government grants received — — (1,029 ) — (181 ) — (1,210 ) Reclassification to assets held-for-sale — (69,758 ) (1 ) (37 ) — (365 ) (70,161 ) Book value as of December 31, 2018 W 461,828 3,535,788 4,979,087 142,256 12,216,934 264,237 21,600,130 Acquisition cost as of December 31, 2018 W 461,828 6,528,939 39,825,070 834,628 12,234,824 633,220 60,518,509 Accumulated depreciation as of December 31, 2018 W — (2,991,445 ) (34,817,982 ) (692,372 ) — (368,893 ) (38,870,782 ) Accumulated impairment loss as of December 31, 2018 W — (1,706 ) (28,001 ) — (17,890 ) — (47,597 ) (*1) As of December 31, 2018, construction-in-progress mainly relates to construction of manufacturing facilities. (*2) Others are mainly amounts transferred from construction-in-progress. (c) Capitalized borrowing costs and capitalization rate for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Capitalized borrowing costs W 16,909 47,686 146,607 Capitalization rate 2.91 % 1.92 % 2.80 %

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Intangible Assets	10. Intangible Assets (a) Changes in intangible assets for the year ended December 31, 2017 are as follows: (In millions of won) Intellectual property Software Member- Development Construction- in-progress Customer relationships Technology Good-will(*2) Others (*3) Total Acquisition cost as of January 1, 2017 W 904,664 806,835 51,564 1,433,791 18,738 59,176 11,074 110,072 13,077 3,408,991 Accumulated amortization as of January 1, 2017 (618,398 ) (661,063 ) — (1,177,451 ) — (26,678 ) (7,382 ) — (13,071 ) (2,504,043 ) Accumulated impairment loss as of January 1, 2017 — — (10,011 ) — — — — — — (10,011 ) Book value as of January 1, 2017 W 286,266 145,772 41,553 256,340 18,738 32,498 3,692 110,072 6 894,937 Additions - internally developed — — — 336,207 — — — — — 336,207 Additions - external purchases 22,746 — 4,819 — 108,761 — — — — 136,326 Amortization(*1) (42,195 ) (78,939 ) — (295,787 ) — (4,659 ) (1,108 ) — (5 ) (422,693 ) Disposals (4 ) — (1,392 ) — — — — — — (1,396 ) Impairment loss — — (1,809 ) — — — — — — (1,809 ) Reversal of impairment loss — — 35 — — — — — — 35 Transfer from construction-in-progress — 98,989 — — (98,989 ) — — (3,218 ) — (3,218 ) Effect of movements in exchange rates (19,847 ) (4,332 ) (6 ) — 2,423 — — (3,806 ) — (25,568 ) Book value as of December 31, 2017 W 246,966 161,490 43,200 296,760 30,933 27,839 2,584 103,048 1 912,821 Acquisition cost as of December 31, 2017 W 895,721 898,278 54,985 1,769,998 30,933 59,176 11,074 103,048 13,077 3,836,290 Accumulated amortization as of December 31, 2017 W (648,755 ) (736,788 ) — (1,473,238 ) — (31,337 ) (8,490 ) — (13,076 ) (2,911,684 ) Accumulated impairment loss as of December 31, 2017 W — — (11,785 ) — — — — — — (11,785 ) (*1) The Group has classified the amortization as manufacturing overhead costs, selling expenses, administrative expenses and research and development expenses. (*2) As of December 31, 2017, the book value of goodwill decreased by W (*3) Others mainly consist of rights to use electricity and gas supply facilities. (b) Changes in intangible assets for the year ended December 31, 2018 are as follows: (In millions of won) Intellectual property Software Member- Development Construction- in-progress Customer relationships Technology Good- will Others (*2) Total Acquisition cost as of January 1, 2018 W 895,721 898,278 54,985 1,769,998 30,933 59,176 11,074 103,048 13,077 3,836,290 Accumulated amortization as of January 1, 2018 (648,755 ) (736,788 ) — (1,473,238 ) — (31,337 ) (8,490 ) — (13,076 ) (2,911,684 ) Accumulated impairment loss as of January 1, 2018 — — (11,785 ) — — — — — — (11,785 ) Book value as of January 1, 2018 W 246,966 161,490 43,200 296,760 30,933 27,839 2,584 103,048 1 912,821 Additions - internally developed — — — 372,835 — — — — — 372,835 Additions - external purchases 24,596 — 2,844 — 100,820 — — — — 128,260 Amortization(*1) (43,437 ) (80,159 ) — (302,685 ) — (3,517 ) (1,107 ) — (1 ) (430,906 ) Disposals — — (721 ) — — — — — — (721 ) Impairment loss — — (82 ) — — — — — — (82 ) Reversal of impairment loss — — 348 — — — — — — 348 Transfer from construction-in-progress — 95,028 449 — (95,028 ) — — — — 449 Effect of movements in exchange rates 1,896 1,240 1 — 238 — — 1,263 — 4,638 Book value as of December 31, 2018 W 230,021 177,599 46,039 366,910 36,963 24,322 1,477 104,311 — 987,642 Acquisition cost as of December 31, 2018 W 926,969 992,139 57,560 2,142,832 36,963 59,176 11,075 104,311 13,077 4,344,102 Accumulated amortization as of December 31, 2018 W (696,948 ) (814,540 ) — (1,775,922 ) — (34,854 ) (9,598 ) — (13,077 ) (3,344,939 ) Accumulated impairment loss as of December 31, 2018 W — — (11,521 ) — — — — — — (11,521 ) (*1) The Group has classified the amortization as manufacturing overhead costs, selling expenses, administrative expenses and research and development expenses. (*2) Others mainly consist of rights to use electricity and gas supply facilities. (c) Development of new projects are divided into research activities and development activities. Expenditures on research activities are recognized in profit or loss and qualifying development expenditures are capitalized, respectively. (d) Development costs as of December 31, 2017 and 2018 are as follows: (i) As of December 31, 2017 (In millions of won and in years) Classification Product Book Value Remaining Useful life Development completed Mobile W 79,372 0.6 TV 36,038 0.6 Notebook 14,311 0.5 Others 12,444 0.4 Sub-Total W 142,165 Development in process Mobile W 117,222 — TV 30,670 — Notebook 2,356 — Others 4,347 — Sub-Total W 154,595 Total W 296,760 (ii) As of December 31, 2018 (In millions of won and in years) Classification Product Book Value Remaining Useful life Development completed Mobile W 108,467 0.5 TV 28,001 0.5 Notebook 4,458 0.6 Others 9,475 0.5 Sub-Total W 150,401 Development in process Mobile W 144,679 — TV 55,580 — Notebook 9,639 — Others 6,611 — Sub-Total W 216,509 Total W 366,910

Financial Liabilities

Financial Liabilities	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Financial Liabilities	11. Financial Liabilities (a) Financial liabilities at the reporting date are as follows: (In millions of won) December 31, 2017 December 31, 2018 Current Current portion of long-term borrowings and bonds W 1,452,926 1,553,907 W 1,452,926 1,553,907 Non-current Won denominated borrowings W 1,251,258 2,700,608 Foreign currency denominated borrowings 1,392,931 2,531,663 Bonds 1,506,003 1,772,599 Derivatives(*) — 25,758 W 4,150,192 7,030,628 (*) Represents exchange rate swap contracts related to foreign currency denominated borrowings and bonds . (b) Won denominated long-term borrowings at the reporting date are as follows: (In millions of won) Lender Annual interest rate as of December 31, 2018 (%) December 31, December 31, Woori Bank 3-year Bond rate – 2.75 W 1,922 1,259 Shinhan Bank — 200,000 — Korea Development Bank and others CD rate (91days) + 0.64, 2.43~3.25 1,250,000 2,850,000 Less current portion of long-term borrowings (200,664 ) (150,651 ) W 1,251,258 2,700,608 (c) Foreign currency denominated long-term borrowings at the reporting date are as follows: ( In millions of won and USD, CNY) Lender Annual interest rate as of December 31, 2018 (%)(*) December 31, December 31, The Export-Import Bank of Korea 3ML+0.75~1.70 W 755,337 955,975 China Construction Bank and others USD: 3ML+0.80~2.00 CNY: PBOC*(0.90~1.05) 1,385,097 2,419,286 Foreign currency equivalent USD 1,500 USD 2,262 CNY 3,263 CNY 5,198 Less current portion of long-term borrowings W (747,503 ) (843,598 ) W 1,392,931 2,531,663 (*) ML represents Month LIBOR (London Inter-Bank Offered Rates) and PBOC represents People’s Bank of China. (d) Details of bonds issued and outstanding at the reporting date are as follows: (In millions of won) Maturity Annual interest rate as December 31, December 31, Won denominated bonds(*1) Publicly issued bonds April 2019 ~ February 2023 1.80~3.45 W 2,015,000 1,900,000 Privately issued bonds May 2025 ~ May 2033 3.25~4.25 — 110,000 Less discount on bonds (4,238 ) (3,949 ) Less current portion (504,759 ) (559,658 ) W 1,506,003 1,446,393 Foreign currency denominated Publicly issued bond November 2021 3.88 W — 335,430 Foreign currency equivalent — USD 300 Less discount on bonds — (9,224 ) W — 326,206 W 1,506,003 1,772,599 (*1) Principal of the won denominated bonds is to be repaid at maturity and interests are paid quarterly. (*2) Principal of the foreign currency denominated bond is to be repaid at maturity and interests are paid semi-annually.

Employee Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Employee Benefits	12. Employee Benefits The Controlling Company and certain subsidiaries’ defined benefit plans provide a lump-sum The defined benefit plans expose the Group to actuarial risks, such as the risk associated with expected periods of service, interest rate risk, market (investment) risk, and others. (a) Net defined benefit liabilities recognized at the reporting date are as follows: (In millions of won) December 31, 2017 December 31, 2018 Present value of partially funded defined benefit obligations W 1,562,424 1,595,423 Fair value of plan assets (1,466,977 ) (1,550,063 ) W 95,447 45,360 (b) Changes in the present value of the defined benefit obligations for the years ended December 31, 2017 and 2018 are as follows: (In millions of won) 2017 2018 Opening defined benefit obligations W 1,401,396 1,562,424 Current service cost 195,850 204,668 Past service cost — (25,749 ) Interest cost 40,844 49,145 Remeasurements (before tax) (114 ) (27,885 ) Benefit payments (76,011 ) (88,562 ) Transfers from (to) related parties 534 (4,217 ) Curtailment of plans — (74,459 ) Others (75 ) 58 Closing defined benefit obligations W 1,562,424 1,595,423 Weighted average remaining maturity of defined benefit obligations as of December 31, 2017 and 2018 are 14.0 years and 14.4 years, respectively. (c) Changes in fair value of plan assets for the years ended December 31, 2017 and 2018 are as follows: (In millions of won) 2017 2018 Opening fair value of plan assets W 1,258,409 1,466,977 Expected return on plan assets 38,453 48,184 Remeasurements (before tax) (16,374 ) (22,195 ) Contributions by employer directly to plan assets 250,998 212,224 Benefit payments (64,509 ) (80,690 ) Curtailment of plans — (74,437 ) Closing fair value of plan assets W 1,466,977 1,550,063 (d) Plan assets at the reporting date are as follows: (In millions of won) December 31, 2017 December 31, 2018 Guaranteed deposits in banks W 1,466,977 1,550,063 As of December 31, 2018, the Controlling Company maintains the plan assets with Mirae Asset Securities Co., Ltd., KB Insurance Co., Ltd. and others. The Group’s estimated additional contribution to the plan assets for the year ending December 31, 2019 is W (e) Expenses recognized in profit or loss for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Current service cost W 210,682 195,850 204,668 Past service cost — — (25,749 ) Net interest cost 10,280 2,391 961 W 220,962 198,241 179,880 Expenses are recognized in the following line items in the consolidated statements of comprehensive income: (In millions of won) 2016 2017 2018 Cost of sales W 177,652 158,418 134,879 Selling expenses 12,513 11,114 11,045 Administrative expenses 16,486 16,287 19,472 Research and development expenses 14,311 12,422 14,484 W 220,962 198,241 179,880 (f) Remeasurements of net defined benefit liabilities (assets) included in other comprehensive income (loss) for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Balance at January 1 W (281,902 ) (163,950 ) (170,510 ) Remeasurements Actuarial profit or loss arising from: Experience adjustment 70,258 (48,890 ) 56,225 Demographic assumptions (4,605 ) (7,702 ) (15,379 ) Financial assumptions 95,429 56,706 (12,961 ) Return on plan assets (5,736 ) (16,374 ) (22,195 ) Share of associates regarding remeasurements 200 441 20 155,546 (15,819 ) 5,710 Income tax (37,594 ) 9,259 (1,169 ) Balance at December 31 W (163,950 ) (170,510 ) (165,969 ) (g) Principal actuarial assumptions at the reporting date (expressed as weighted averages) are as follows: 2017 2018 Expected rate of salary increase 4.7 % 4.3 % Discount rate for defined benefit obligations 3.2 % 2.8 % Assumptions regarding future mortality are based on published statistics and mortality tables. The current mortality underlying the values of the liabilities in the defined benefit plans are as follows: December 31, 2017 December 31, 2018 Teens Males 0.01 % 0.01 % Females 0.00 % 0.00 % Twenties Males 0.01 % 0.01 % Females 0.00 % 0.00 % Thirties Males 0.01 % 0.01 % Females 0.01 % 0.01 % Forties Males 0.03 % 0.03 % Females 0.02 % 0.02 % Fifties Males 0.05 % 0.05 % Females 0.02 % 0.02 % (h) Reasonably possible changes to respective relevant actuarial assumptions would have affected the defined benefit obligations by the following amounts as of December 31, 2018: (In millions of won) Defined benefit obligation 1% increase 1% decrease Discount rate for defined benefit obligations W (199,750 ) 241,608 Expected rate of salary increase 236,002 (199,363 )

Provisions

Provisions	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Provisions	13. Provisions Changes in provisions for the year ended December 31, 2017 are as follows: (In millions of won) Litigation and claims Warranties(*) Others Total Balance of January 1, 2017 W — 62,462 1,665 64,127 Additions 43 251,131 170 251,344 Usage and reclassification — (211,143 ) — (211,143 ) Balance at December 31, 2017 W 43 102,450 1,835 104,328 Current W 43 74,138 1,835 76,016 Non-current W — 28,312 — 28,312 Changes in provisions for the year ended December 31, 2018 are as follows: (In millions of won) Litigations and claims Warranties(*) Others Total Balance at January 1, 2018 W 43 102,450 1,835 104,328 Adjustment from adoption of IFRS 15 — — 9,789 9,789 Additions (reversals) — 234,928 (2,694 ) 232,234 Usage (43 ) (215,290 ) — (215,333 ) Balance at December 31, 2018 W — 122,088 8,930 131,018 Current W — 89,324 8,930 98,254 Non-current W — 32,764 — 32,764 (*) The provision for warranties covers defective products and is normally applicable for 18 months from the date of purchase. The warranty liability is calculated by using historical and anticipated rates of warranty claims, and costs per claim to satisfy the Group’s warranty obligation.

Other Liabilities

Other Liabilities	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Other Liabilities	14. Other Liabilities Other liabilities at the reporting date are as follows: (In millions of won) December 31, 2017 December 31, 2018 Current liabilities Withholdings W 63,766 30,970 Unearned revenues 12,225 43,841 Security deposits — 165 W 75,991 74,976 Non-current Long-term accrued expenses W 70,561 80,817 Long-term other accounts payable 2 3,103 Long-term unearned revenue — 2,116 Security deposits — 10,790 W 70,563 96,826

Contingent Liabilities and Comm

Contingent Liabilities and Commitments	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Contingent Liabilities and Commitments	15. Contingent Liabilities and Commitments (a) Legal Proceedings Anti-trust litigations Argos Limited and affiliated companies (“Argos”) filed a Notice of Claim against the Controlling Company and LG Display Taiwan Co., Ltd. in the High Court of Justice in London alleging infringement of Treaty on the Functioning of the European Union and Agreement on the European Economic Area. The Controlling Company and LG Display Taiwan Co., Ltd. reached a settlement with Argos in November 2018. Others The Group is defending against various claims in addition to pending proceedings described above. The Group does not have a present obligation for these matters and has not recognized any provision at December 31, 2018. (b) Commitments Factoring and securitization of accounts receivable The Controlling Company has agreements with Korea Development Bank and several other banks for accounts receivable sales negotiating facilities of up to an aggregate of USD1,670 million ( W The Controlling Company and oversea subsidiaries entered into agreements with financial institutions for accounts receivables sales negotiating facilities. The respective maximum amount of accounts receivables sales and the amount of sold accounts receivables before maturity by contract are as follows: (In millions of USD and KRW) Classification Financial institutions Maximum Not yet due Contractual amount KRW Contractual KRW Controlling Company Shinhan Bank KRW USD 90,000 25 90,000 — USD 12 — Sumitomo Mitsui Banking Corporation USD 20 22,362 — — KRW 130,000 130,000 KRW 36,089 36,089 Bank of Tokyo-Mitsubishi UFJ USD 40 44,724 USD 40 44,516 BNP Paribas USD 200 223,620 USD 12 13,630 ING Bank USD 150 167,715 USD 31 35,554 USD 435 USD 95 KRW 220,000 706,374 KRW 36,089 143,075 Subsidiaries LG Display Singapore Pte. Ltd. Standard Chartered Bank USD 300 335,430 USD 209 233,364 LG Display Taiwan Co., Ltd. BNP Paribas USD 52 58,141 USD 9 10,063 Australia and New Zealand Banking Group Ltd USD 70 78,267 USD 52 58,142 Taishin International Bank USD 289 323,131 USD 86 96,157 LG Display Germany GmbH Citibank USD 160 178,896 — — BNP Paribas USD 75 83,858 USD 75 83,767 LG Display America, Inc. Hongkong & Shanghai Banking Corp. USD 400 447,240 USD 230 257,164 Standard Chartered Bank USD 600 670,860 USD 515 575,823 Sumitomo Mitsui Banking Corporation USD 80 89,448 USD 67 74,915 LG Display Japan Co., Ltd. Sumitomo Mitsui Banking Corporation USD 20 22,362 — — LG Display Guangzhou Trading Co., Ltd. Industrial and Commercial Bank of China — — — — USD 2,046 2,287,633 USD 1,243 1,389,395 USD 2,481 USD 1,338 KRD 220,000 2,994,007 KRW 36,089 1,532,470 In connection with all of the contracts in the above table, the Controlling Company has sold its accounts receivable without recourse. Letters of credit As of December 31, 2018, the Controlling Company has agreements in relation to the opening of letters of credit up to USD 30 million ( W W W Payment guarantees The Controlling Company obtained payment guarantees amounting to USD 1,538 million ( W . W W LG Display (China) Co., Ltd. and other subsidiaries are provided with payment guarantees from the China Construction Bank and other various banks amounting to CNY1,711 million ( W W W W W W License agreements As of December 31, 2018, in relation to its LCD business, the Group has technical license agreements with Hitachi Display, Ltd. and others and has a trademark license agreement with LG Corp. Long-term supply agreement As of December 31, 2018, in connection with long-term W The Controlling Company received payment guarantees amounting to USD 1,538 million ( W Pledged Assets Regarding the secured bank loan amounting to USD 240 million ( W W

Capital and Reserves

Capital and Reserves	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Capital and Reserves	16. Capital and Reserves (a) Share capital The Controlling Company is authorized to issue 500,000,000 shares of capital stock (par value W (b) Reserves Reserves consist mainly of the following: Translation reserve The translation reserve comprises all foreign currency differences arising from the translation of the financial statements of foreign operations. Other comprehensive income (loss) from associates The other comprehensive income (loss) from associates comprises the amount related to change in equity of investments in equity accounted investees. Reserves at the reporting date are as follows: (In millions of won) December 31, 2017 December 31, 2018 Foreign currency translation differences for foreign operations W (259,749 ) (272,474 ) Other comprehensive loss from associates (excluding remeasurements of net defined benefit liabilities) (28,531 ) (28,494 ) W (288,280 ) (300,968 ) The movement in reserves for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) Net change in fair value of available-for- sale financial assets Foreign currency for foreign operations Other income (loss) from associates (excluding Total January 1, 2016 W 58 18,196 (24,020 ) (5,766 ) Change in reserves (58 ) (77,238 ) (5,416 ) (82,712 ) December 31, 2016 — (59,042 ) (29,436 ) (88,478 ) January 1, 2017 — (59,042 ) (29,436 ) (88,478 ) Change in reserves — (200,707 ) 905 (199,802 ) December 31, 2017 — (259,749 ) (28,531 ) (288,280 ) January 1, 2018 — (259,749 ) (28,531 ) (288,280 ) Change in reserves — (12,725 ) 37 (12,688 ) December 31, 2018 — (272,474 ) (28,494 ) (300,968 )

Geographic and Other Informatio

Geographic and Other Information	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Geographic and Other Information	17. Geographic and Other Information The following is a summary of sales by region based on the location of the customers for the years ended December 31, 2016, 2017 and 2018. (a) Revenue by geography (In millions of won) Region 2016 2017 2018 Domestic W 1,825,191 1,996,183 1,589,452 Foreign China 18,367,767 18,090,974 15,242,533 Asia (excluding China) 2,148,676 2,383,390 2,481,112 United States 2,053,317 2,724,714 2,462,918 Europe (excluding Poland) 983,672 1,433,126 1,496,138 Poland 1,125,451 1,161,829 1,064,418 24,678,883 25,794,033 22,747,119 W 26,504,074 27,790,216 24,336,571 Sales to Company A and Company B amount to W W W W W W end-brand (b) Non-current (In millions of won) Region December 31, 2017 December 31, 2018 Property, plant and Intangible assets Property, plant and Intangible assets Domestic W 12,487,111 731,373 14,984,688 816,808 Foreign China 2,929,739 17,244 5,049,216 12,332 Others 785,110 164,204 1,566,226 158,502 W 3,714,849 181,448 6,615,442 170,834 W 16,201,960 912,821 21,600,130 987,642 (c) Revenue by product and services (In millions of won) Product 2016 2017 2018 Panels for: Televisions W 10,132,520 11,717,982 9,727,260 Desktop monitors 4,035,195 4,393,482 4,040,025 Tablet products 2,695,808 2,369,634 1,990,766 Notebook computers 2,383,532 2,244,088 2,836,888 Mobile and others 7,257,019 7,065,030 5,741,632 W 26,504,074 27,790,216 24,336,571

The Nature of Expenses and Othe

The Nature of Expenses and Others	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
The Nature of Expenses and Others	18. The Nature of Expenses and Others The classification of expenses by nature for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Changes in inventories W 63,884 (62,299 ) (341,120 ) Purchases of raw materials, merchandise and others 14,244,942 13,548,848 12,863,812 Depreciation and amortization 3,021,571 3,214,576 3,554,565 Outsourcing fees 819,742 771,697 825,393 Labor costs 3,022,607 3,258,427 3,222,110 Supplies and others 1,053,245 1,239,915 1,010,352 Utility 840,664 865,347 899,075 Fees and commissions 638,732 692,125 722,134 Shipping costs 224,742 249,820 240,288 Advertising 67,636 236,440 112,400 Warranty expenses 166,691 251,131 234,928 Travel 73,807 92,976 104,009 Taxes and dues 74,506 91,806 123,210 Others 927,218 919,051 757,673 W 25,239,987 25,369,860 24,328,829 Total expenses consist of cost of sales, selling, administrative, research and development expenses and other non-operating

Selling and Administrative Expe

Selling and Administrative Expenses	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Selling and Administrative Expenses	19. Selling and Administrative Expenses Details of selling and administrative expenses for the years ended December 31, 2016, 2017, and 2018 are as follows: (In millions of won) 2016 2017 2018 Salaries(*1) W 276,824 327,288 500,610 Expenses related to defined benefit plans(*2) 28,999 27,401 30,724 Other employee benefits 89,717 94,740 90,348 Shipping costs 191,442 214,866 200,434 Fees and commissions 192,786 197,070 221,050 Depreciation 129,225 138,711 174,575 Taxes and dues 30,523 46,317 65,621 Advertising 67,636 236,440 112,400 Warranty expenses 166,691 251,131 234,928 Rent 25,840 26,711 26,691 Insurance 11,561 12,459 11,584 Travel 23,343 27,879 24,659 Training 14,464 16,311 13,309 Others 56,342 73,181 65,343 W 1,305,393 1,690,505 1,772,276 (*1) The expense related to retirement allowance for the year ended December 31, 2018 is W (*2) The expense related to the define contribution plan for the year ended December 31, 2018 is W

Personnel Expenses

Personnel Expenses	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Personnel Expenses	20. Personnel Expenses Details of personnel expenses for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Salaries and wages W 2,418,869 2,704,217 2,720,014 Other employee benefits 459,730 483,704 500,169 Contributions to National Pension plan 69,588 73,061 75,668 Expenses related to defined benefit plan and defined contribution plan(*) 220,962 198,241 180,737 W 3,169,149 3,459,223 3,476,588 (*) The expense related to the define contribution plan for the year ended December 31, 2018 is W

Other Income and Other Expenses

Other Income and Other Expenses	12 Months Ended
	Dec. 31, 2018
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Other Income and Other Expenses	21. Other Income and Other Expenses (a) Details of other income for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Foreign currency gain W 1,543,909 969,425 970,306 Gain on disposal of property, plant and equipment 14,637 101,227 6,620 Gain on disposal of intangible assets — 308 239 Reversal of impairment loss on intangible assets — 35 348 Rental income 5,152 2,212 3,584 Others 28,103 8,539 23,040 W 1,591,801 1,081,746 1,004,037 (b) Details of other expenses for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Foreign currency loss W 1,420,502 1,189,193 1,030,084 Other bad debt expenses — 1,798 4 Loss on disposal of property, plant and equipment 7,466 20,030 15,048 Impairment loss on property, plant and equipment 1,610 — 43,601 Loss on disposal of intangible assets 75 30 — Impairment loss on intangible assets 138 1,809 82 Donations 22,221 17,152 7,698 Expenses related to legal proceedings or claims and others 15,819 443 18,716 W 1,467,831 1,230,455 1,115,233

Finance Income and Finance Cost

Finance Income and Finance Costs	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Finance Income and Finance Costs	22. Finance Income and Finance Costs (a) Finance income and costs recognized in profit or loss for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Finance income Interest income W 42,079 60,106 69,020 Foreign currency gain 81,554 210,890 160,989 Gain on disposal of investments in equity accounted investees 11,367 3,669 — Reversal of impairment loss of investments in equity accounted investees — — 802 Gain on transaction of derivatives 4,427 3,106 2,075 Gain on valuation of derivatives 244 1,070 13,059 Gain on disposal of available-for-sale — 8 — Gain on valuation of financial asset at fair value through profit or loss — 170 8,186 W 139,671 279,019 254,131 Finance costs Interest expense W 113,285 90,538 80,517 Foreign currency loss 132,320 126,642 184,309 Loss on disposal of investments in equity accounted investees 5,643 42,112 595 Loss on impairment of investments in equity accounted investees 6,137 4,234 17,397 Loss on impairment of available-for-sale 3,757 1,948 — Loss on valuation of financial asset at fair value through profit or loss 118 — 225 Loss on sale of trade accounts and notes receivable 2,886 784 13,361 Loss on transaction of derivatives 334 514 49 Loss on valuation of derivatives 472 — 26,600 Others 1,234 2,084 3,840 W 266,186 268,856 326,893 (b) Finance income and costs recognized in other comprehensive income or loss for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Foreign currency translation differences for foreign operations W (90,503 ) (231,738 ) (19,987 ) Net change in fair value of available-for-sale (77 ) — — Tax effect 19 — — Finance income (costs) recognized in other comprehensive income (loss) after tax W (90,561 ) (231,738 ) (19,987 )

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Income Taxes	23. Income Taxes (a) Details of income tax expense (benefit) for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Current tax expense Current year 361,237 512,123 167,394 Adjustment for prior years — — 82,225 W 361,237 512,123 249,619 Deferred tax expense (benefit) Origination and reversal of temporary differences (49,190 ) (104,835 ) (226,360 ) Change in unrecognized deferred tax assets 72,678 (11,708 ) 64,818 23,488 (116,543 ) (161,542 ) Income tax expense W 384,725 395,580 88,077 (b) Income taxes recognized directly in other comprehensive income or loss for the years ended December 31, 2016, 2017, and 2018 are as follows: (In millions of won) 2016 Before tax Tax benefit (expense) Net of tax Net change in fair value of available-for-sale W (77 ) 19 (58 ) Remeasurements of net defined benefit liabilities (assets) 155,346 (37,594 ) 117,752 Foreign currency translation differences for foreign operations (90,503 ) — (90,503 ) Change in equity of equity method investee (5,216 ) — (5,216 ) W 59,550 (37,575 ) 21,975 (In millions of won) 2017 Before tax Tax benefit Net of tax Net change in fair value of available-for-sale W — — — Remeasurements of net defined benefit liabilities (assets) (16,260 ) 9,259 (7,001 ) Foreign currency translation differences for foreign operations (231,738 ) — (231,738 ) Change in equity of equity method investee 1,346 — 1,346 W (246,652) 9,259 (237,393 ) (In millions of won) 2018 Before tax Tax expense Net of tax Net change in fair value of available-for-sale W — — — Remeasurements of net defined benefit liabilities (assets) 5,690 (1,169 ) 4,521 Foreign currency translation differences for foreign operations (19,987 ) — (19,987 ) Change in equity of equity method investee 57 — 57 W (14,240) (1,169 ) (15,409 ) (c) Reconciliation of the actual effective tax rate for the years ended December 31, 2016, 2017, and 2018 is as follows: (In millions of won) 2016 2017 2018 Profit (loss) before income taxes W 1,316,233 2,332,632 (91,366 ) Income tax using the statutory tax rate of each country 33.49 % 440,753 28.54 % 665,733 (33.60 %) 30,695 Non-deductible 3.39 % 44,606 2.72 % 63,416 (40.07 %) 36,608 Tax credits (11.45 %) (150,663 ) (10.64 %) (248,191 ) 117.27 % (107,146 ) Change in unrecognized deferred tax assets 5.52 % 72,678 (0.50 %) (11,708 ) (70.94 %) 64,818 Adjustment for prior years — — — — (90.00 %) 82,225 Effect on change in tax rate (Note 24(d)) — — (3.10 %) (72,376 ) 15.68 % (14,326 ) Others (1.72 %) (22,649 ) (0.06 %) (1,294 ) 5.25 % (4,797 ) Actual income tax expense W 384,725 395,580 88,077 Actual effective tax rate 29.23 % 16.96 % (*) (*) Actual effective tax rate are not calculated due to loss before income tax.

Deferred Tax Assets and Liabili

Deferred Tax Assets and Liabilities	12 Months Ended
	Dec. 31, 2018
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Deferred Tax Assets and Liabilities	24. Deferred Tax Assets and Liabilities (a) Unrecognized deferred tax liabilities As of December 31, 2017 and 2018, in relation to the temporary differences on investments in subsidiaries amounting to W W (b) Unused tax credit carryforwards for which no deferred tax asset is recognized Realization of deferred tax assets related to tax credit carryforwards which are primarily related to Korea is dependent on whether sufficient taxable income will be generated prior to their expiration. As of December 31, 2018, the Controlling Company recognized deferred tax assets of W (In millions of won) December 31, 2019 December 31, 2020 December 31, 2021 December 31, 2022 Tax credit carryforwards W — 58,391 91,862 (c) Deferred tax assets and liabilities are attributable to the following: (In millions of won) Assets Liabilities Total December, 31, December, 31, December, 31, December, 31, December, 31, December, 31, Other accounts receivable, net W — — (1,441 ) (1,013 ) (1,441 ) (1,013 ) Inventories, net 34,550 60,606 — — 34,550 60,606 Defined benefit liabilities, net 2,375 — — — 2,375 — Unrealized gain or loss and others 29,061 13,404 — — 29,061 13,404 Accrued expenses 183,903 126,072 — — 183,903 126,072 Property, plant and equipment 409,928 445,721 — (1,495 ) 409,928 444,226 Intangible assets 3,457 3,468 (24,646 ) (14,588 ) (21,189 ) (11,120 ) Provisions 27,018 32,468 — — 27,018 32,468 Gain or loss on foreign currency translation, net 13 13 — — 13 13 Others 27,562 20,850 — (7,665 ) 27,562 13,185 Tax loss carryforwards — 134,845 — — — 134,845 Tax credit carryforwards 268,926 308,393 — — 268,926 308,393 Deferred tax assets (liabilities) W 986,793 1,145,840 (26,087 ) (24,761 ) 960,706 1,121,079 (d) Changes in deferred tax assets and liabilities for the years ended December 31, 2017 and 2018 are as follows: (In millions of won) January 1, Profit or loss Other (loss) December 31, Profit or loss Other December 31, Other accounts receivable, net W (1,190 ) (251 ) — (1,441 ) 428 — (1,013 ) Inventories, net 35,771 (1,221 ) — 34,550 26,056 — 60,606 Defined benefit liabilities, net 10,817 (17,701 ) 9,259 2,375 (1,206 ) (1,169 ) — Subsidiaries and associates 34,777 (5,716 ) — 29,061 (15,657 ) — 13,404 Accrued expenses 122,998 60,905 — 183,903 (57,831 ) — 126,072 Property, plant and equipment 338,860 71,068 — 409,928 34,298 — 444,226 Intangible assets (31,027 ) 9,838 — (21,189 ) 10,069 — (11,120 ) Provisions 15,051 11,967 — 27,018 5,450 — 32,468 Gain or loss on foreign currency translation, net 11 2 — 13 — — 13 Others 21,435 6,127 — 27,562 (14,377 ) — 13,185 Tax loss carryforwards — — — — 134,845 — 134,845 Tax credit carryforwards 287,400 (18,474 ) — 268,926 39,467 — 308,393 Deferred tax assets (liabilities) W 834,903 116,544 9,259 960,706 161,542 (1,169 ) 1,121,079 Statutory tax rate applicable to the Controlling Company is 24.2% for the year ended December 31, 2017. During the year ended December 31, 2017, certain amendments to corporate income tax rules in Korea were enacted and effective on January 1, 2018 that resulted in application of 27.5% for taxable income in excess of W

Earnings (Loss) Per Share Attri

Earnings (Loss) Per Share Attributable to Owners of the Controlling Company	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Earnings (Loss) Per Share Attributable to Owners of the Controlling Company	25. Earnings (Loss) Per Share Attributable to Owners of the Controlling Company (a) Basic earnings (loss) per share for the years ended December 31, 2016, 2017 and 2018 are as follows: (In won and No. of shares) 2016 2017 2018 Profit (loss) attributable to owners of the Controlling Company W 906,714,278,688 1,802,756,119,275 (207,239,484,774 ) Weighted-average number of common stocks outstanding 357,815,700 357,815,700 357,815,700 Earnings (loss) per share W 2,534 5,038 (579 ) For the years ended December 31, 2016, 2017 and 2018, there were no events or transactions that resulted in changes in the number of common stocks used for calculating earnings (loss) per share. (b) Diluted earnings (loss) per share for the years ended December 31, 2016, 2017 and 2018 are not calculated since there was no potential common stock.

Financial Risk Management

Financial Risk Management	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Financial Risk Management	26. Financial Risk Management The Group is exposed to credit risk, liquidity risk and market risks. The Group identifies and analyzes such risks, and controls are implemented under a risk management system to monitor and manage these risks at below a threshold level. (a) Market Risk Market risk is the risk that changes in market prices, such as foreign exchange rates, interest rates and equity prices, will affect the Group’s income or the value of its holdings of financial instruments. The objective of market risk management is to manage and control market risk exposures within acceptable parameters, while optimizing the return. (i) Currency Risk The Group is exposed to currency risk on sales, purchases and borrowings that are denominated in a currency other than the functional currency of the Controlling Company, Korean won (KRW). The currencies in which these transactions primarily are denominated are USD, CNY, JPY, etc. Interest on borrowings is denominated in the currency of the borrowing. Generally, borrowings are denominated in currencies that match the cash flows generated by the underlying operations of the Group, primarily KRW, USD and CNY. In respect of other monetary assets and liabilities denominated in foreign currencies, the Group adopts policies to ensure that its net exposure is kept to an acceptable level by buying or selling foreign currencies at spot rates when necessary to address short-term imbalances. The Group entered into a currency swap contract to hedge currency risk with respect to foreign currency borrowings and bonds. i) Exposure to currency risk The Group’s exposure to foreign currency risk based on notional amounts at the reporting date is as follows: (In millions) December 31, 2017 USD JPY CNY TWD EUR PLN VND Cash and cash equivalents 1,228 152 6,940 16 3 165 342,063 Deposits in banks — — 750 — — — — Trade accounts and notes receivable 3,316 11 1,453 — — — — Non-trade 62 1,340 136 2 9 — 13,405 Other assets denominated in foreign currencies 1 206 596 7 — — 1,882 Trade accounts and notes payable (1,345 ) (14,898 ) (2,843 ) — — — (102,398 ) Other accounts payable (285 ) (14,653 ) (2,403 ) (11 ) (8 ) (4 ) (2,138,370 ) Borrowings (1,500 ) — (3,263 ) — — — — Net exposure 1,477 (27,842 ) 1,366 14 4 161 (1,883,418 ) (In millions) December 31, 2018 USD JPY CNY TWD EUR PLN VND Cash and cash equivalents 790 83 5,515 121 8 206 2,070,889 Trade accounts and notes receivable 2,175 7 1,098 — — — — Non-trade 21 852 201 3 4 — 23,182 Other assets denominated in foreign currencies 33 220 11,157 108 12 23 2,782 Trade accounts and notes payable (863 ) (12,501 ) (2,862 ) — — — (355,390 ) Other accounts payable (928 ) (20,326 ) (4,762 ) (6 ) (3 ) (4 ) (1,585,130 ) Borrowings (2,571 ) — (5,198 ) — — — — Aggregate notional amounts in financial position (1,343 ) (31,665 ) 5,149 226 21 225 156,333 Currency swap contracts 780 — — — — — — Net exposure (563 ) (31,665 ) 5,149 226 21 225 156,333 Average exchange rates applied during the reporting periods are as follows: (In won) Average rate Reporting date spot rate 2016 2017 2018 December 31, December 31, USD W 1,159.83 1,131.08 1,100.21 1,071.40 1,118.10 JPY 10.67 10.09 9.96 9.49 10.13 CNY 174.40 167.52 166.41 163.65 162.76 TWD 35.97 37.16 36.51 35.92 36.58 EUR 1,283.95 1,277.01 1,298.53 1,279.25 1,279.16 PLN 294.41 299.98 304.87 306.07 297.33 VND 0.0518 0.0498 0.0478 0.0472 0.0482 ii) Sensitivity analysis A weaker won, as indicated below, against the following currencies which comprise the Group’s assets or liabilities denominated in a foreign currency as of December 31, 2017 and 2018, would have increased (decreased) equity and profit or loss by the amounts shown below. This analysis is based on foreign currency exchange rate variances that the Group considers to be reasonably possible as of the end of the reporting period. The analysis assumes that all other variables, in particular interest rates, would remain constant. The changes in equity and profit or loss would have been as follows: (In millions of won) December 31, 2017 December 31, 2018 Equity Profit or Equity Profit or loss USD (5 percent weakening) W 50,040 91,238 (46,136 ) 38,725 JPY (5 percent weakening) (10,294 ) (9,141 ) (12,060 ) (10,497 ) CNY (5 percent weakening) 13,212 (6,396 ) 41,779 318 TWD (5 percent weakening) 23 1 413 1 EUR (5 percent weakening) 16 594 1,197 390 PLN (5 percent weakening) 2,515 (120 ) 3,451 (236 ) VND (5 percent weakening) (4,445 ) — 273 273 A stronger won against the above currencies as of December 31, 2017 and 2018 would have had the equal but opposite effect on the above currencies to the amounts shown above, on the basis that all other variables remain constant. (ii) Interest Rate Risk i) Profile The interest rate profile of the Group’s interest-bearing financial instruments at the reporting date is as follows: (In millions of won) December 31, 2017 December 31, 2018 Fixed rate instruments Financial assets W 3,360,800 2,443,583 Financial liabilities (2,962,671 ) (5,033,515 ) W 398,129 (2,589,932 ) Variable rate instruments Financial liabilities W (2,640,447 ) (3,525,262 ) ii) Equity and profit or loss sensitivity analysis for variable rate instruments For the years ended December 31, 2017 and 2018 a change of 100 basis points in interest rates at the reporting date would have increased (decreased) equity and profit or loss by the amounts shown below for the respective following years. This analysis assumes that all other variables, in particular foreign currency rates, remain constant. (In millions of won) Equity Profit or loss 1%p increase 1%p decrease 1%p increase 1%p decrease December 31, 2017 Variable rate instruments(*) W (17,362 ) 17,362 (17,362 ) 17,362 December 31, 2018 Variable rate instruments(*) W (25,558 ) 25,558 (25,558 ) 25,558 (*) Financial instruments subject to interest rate swap not qualified for hedging are excluded. (iii) Credit risk Credit risk is the risk of financial loss to the Group if a customer or counterparty to a financial instrument fails to meet its contractual obligations, and arises principally from the Group’s receivables from customers. The Group’s exposure to credit risk of trade and other receivables is influenced mainly by the individual characteristics of each customer. However, management believes that the demographics of the Group’s customer base, including the default risk of the country in which customers operate, do not have a significant influence on credit risk since the majority of the customers are global electronic appliance manufacturers operating in global markets. The Group establishes credit limits for each customer and each new customer is analyzed quantitatively and qualitatively before determining whether to utilize third party guarantees, insurance or factoring as appropriate. In relation to the impairment of financial assets, the Group recognizes expected credit loss and its changes at each reporting date subsequent to initial recognition of financial asset according to an expected credit loss impairment model. The carrying amount of financial assets represents the maximum credit exposure. The maximum exposure to credit risk as of December 31, 2017 and 2018 are as follows: i) As of December 31, 2017 (In millions of won) December 31, 2017 Cash and cash equivalents W 2,602,560 Deposits in banks 758,089 Trade accounts and notes receivable 4,325,120 Non-trade 150,554 Accrued income 14,273 Available-for-sale 162 Financial assets at fair value through profit or loss 1,552 Deposits 30,378 Short-term loans 16,766 Long-term loans 32,408 Long-term non-trade 8,738 Derivatives 842 W 7,941,442 ii) As of December 31, 2018 (In millions of won) December 31, 2018 Financial assets carried at amortized cost Cash and cash equivalents W 2,365,022 Deposits in banks 78,411 Trade accounts and notes receivable 2,829,163 Non-trade 159,238 Accrued income 10,075 Deposits 91,123 Short-term loans 16,116 Long-term 55,048 Long-term non-trade 11,448 W 5,615,644 Financial assets at fair value through profit or loss Convertible bonds W 1,327 Derivatives 13,059 W 14,386 Financial assets at fair value through other comprehensive income Debt instrument W 161 W 5,630,191 Credit risk is the risk of financial loss to the Group if a customer or counterparty to a financial instrument fails to meet its contractual obligations, and arises primarily from the sales and investing activities. Trade accounts and notes receivables are insured in order to manage credit risk and uninsured trade accounts and notes receivables are managed in accordance with the Group’s management policy. (c) Liquidity Risk Liquidity risk is the risk that the Group will encounter difficulty in meeting the obligations associated with its financial liabilities that are settled by delivering cash or another financial asset. The Group’s approach to managing liquidity is to ensure, as far as possible, that it will always have sufficient liquidity to meet its liabilities when due, under both normal and stressed conditions, without incurring unacceptable losses or risking damage to the Group’s reputation. The Group has historically been able to satisfy its cash requirements from cash flows from operations and debt and equity financing. To the extent that the Group does not generate sufficient cash flows from operations to meet its capital requirements, the Group may rely on other financing activities, such as external long-term borrowings and offerings of debt securities, equity-linked and other debt securities. In addition, the Group maintains a line of credit with various banks. The following are the contractual maturities of financial liabilities, including estimated interest payments, as of December 31, 2018. ( In millions of won ) Contractual cash flows Carrying Total 6 months 6-12 1-2 2-5 More than Non-derivative Secured bank borrowings W 268,093 268,190 268,190 — — — — Unsecured bank borrowings 5,958,427 6,588,502 565,832 356,688 973,297 4,169,682 523,003 Unsecured bond issues 2,332,257 2,537,553 291,738 328,400 456,990 1,320,248 140,177 Trade accounts and notes payable 3,087,461 3,087,461 3,087,461 — — — — Other accounts payable 3,566,629 3,566,629 3,565,599 1,030 — — — Long-term other accounts payable 3,103 3,103 — — 2,077 1,026 — Security deposits 10,955 10,955 — 165 10,790 — — Derivative financial liabilities Derivatives W 25,758 (35,140 ) (6,742 ) (6,728 ) (12,517 ) (9,153 ) — W 15,252,683 16,027,253 7,772,078 679,555 1,430,637 5,481,803 663,180 It is not expected that the cash flows included in the maturity analysis could occur significantly earlier, or at significantly different amounts. (d) Capital Management Management’s policy is to maintain a capital base so as to maintain investor, creditor and market confidence and to sustain future development of the business. Liabilities to equity ratio, net borrowings to equity ratio and other financial ratios are used by management to achieve an optimal capital structure. Management also monitors the return on capital as well as the level of dividends to ordinary shareholders. (In millions of won) December 31, 2017 December 31, 2018 Total liabilities W 14,178,177 18,289,464 Total equity 14,981,510 14,886,246 Cash and deposits in banks(*1) 3,360,638 2,443,422 Borrowings (including bonds) 5,603,118 8,558,777 Total liabilities to equity ratio 95 % 123 % Net borrowings to equity ratio(*2) 15 % 41 % (*1) Cash and deposits in banks consist of cash and cash equivalents and current deposit in banks. (*2) Net borrowings to equity ratio is calculated by dividing total borrowings (including bonds) less cash and current deposits in banks by total equity. (e) Determination of fair value (i) Measurement of fair value A number of the Group’s accounting policies and disclosures require the determination of fair value, for both financial and non-financial i) Current assets and liabilities The carrying amounts approximate fair value because of the short maturity of these instruments. ii) Trade receivables and other receivables The fair value of trade and other receivables is estimated as the present value of future cash flows, discounted at the market rate of interest at the reporting date. This fair value is determined for disclosure purposes. The carrying amounts of short-term receivables approximate fair value. iii) Investments in equity and debt securities The fair value of marketable financial assets at fair value through profit or loss and at fair value through other comprehensive income is determined by reference to their quoted closing bid price at the reporting date. The fair value of non-marketable iv) Non-derivative Fair value, which is determined for disclosure purposes, except for the liabilities at FVTPL, is calculated based on the present value of future principal and interest cash flows, discounted at the market rate of interest at the reporting date. (ii) Fair values versus carrying amounts The fair values of financial assets and liabilities, together with the carrying amounts shown in the consolidated statements of financial position as of December 31, 2017 and 2018 are as follows: i) As of December 31, 2017 (In millions of won) December 31, 2017 Carrying Fair values Assets carried at fair value Available-for-sale W 162 162 Financial asset at fair value through profit or loss 1,552 1,552 Derivatives 842 842 Assets carried at amortized cost Cash and cash equivalents W 2,602,560 (*) Deposits in banks 758,089 (*) Trade accounts and notes receivable 4,325,120 (*) Non-trade 150,554 (*) Accrued income 14,273 (*) Deposits 30,378 (*) Short-term loans 16,766 (*) Long-term 32,408 (*) Long-term non-trade 8,738 (*) Liabilities carried at amortized cost Secured bank borrowings W 642,172 642,172 Unsecured bank borrowings 2,950,184 2,955,399 Unsecured bond issues 2,010,762 2,016,086 Trade accounts and notes payable 2,875,090 (*) Other accounts payable 3,169,937 3,170,147 Long-term other accounts payable 2 (*) (*) Excluded from disclosures as the carrying amount approximates fair value. ii) As of December 31, 2018 (In millions of won) December 31, 2018 Carrying amounts Fair values Financial assets carried at amortized cost Cash and cash equivalents W 2,365,022 (*) Deposits in banks 78,411 (*) Trade accounts and notes receivable 2,829,163 (*) Non-trade 159,238 (*) Accrued income 10,075 (*) Deposits 91,123 (*) Short-term loans 16,116 (*) Long-term 55,048 (*) Long-term non-trade 11,448 (*) Financial assets at fair value through profit or loss Equity instrument W 13,681 13,681 Convertible bonds 1,327 1,327 Derivatives 13,059 13,059 Financial assets at fair value through other comprehensive income Debt instrument W 161 161 Financial liabilities at fair value through profit or loss Derivatives W 25,758 25,758 Financial liabilities carried at amortized cost Secured bank borrowings W 268,093 268,093 Unsecured bank borrowings 5,958,427 6,013,903 Unsecured bond issues 2,332,257 2,384,987 Trade accounts and notes payable 3,087,461 (*) Other accounts payable 3,566,629 (*) Long-term other accounts payable 3,103 (*) Security deposits 10,955 (*) (*) Excluded from disclosures as the carrying amount approximates fair value. (iii) Fair values of financial assets and liabilities i) Fair value hierarchy The table below analyzes financial instruments carried at fair value based on the input variables used in the valuation method to measure fair value of assets and liabilities. The different levels have been defined as follows: • Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities • Level 2: inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly • Level 3: inputs for the asset or liability that are not based on observable market data ii) Financial instruments measured at fair value Fair value hierarchy classifications of the financial instruments that are measured at fair value as of December 31, 2017 and 2018 are as follows: (In millions of won) Level 1 Level 2 Level 3 Total December 31, 2017 Available-for-sale W 162 — — 162 Financial assets at fair value through profit or loss — — 1,552 1,552 Derivatives — — 842 842 (In millions of won) Level 1 Level 2 Level 3 Total December 31, 2018 Financial assets at fair value through profit or loss Equity instrument W — — 13,681 13,681 Convertible bonds — — 1,327 1,327 Derivatives — — 13,059 13,059 Financial asset at fair value through other comprehensive income Debt instrument W 161 — — 161 Financial liabilities at fair value through profit or loss Derivatives W — — 25,758 25,758 iii) Financial instruments not measured at fair value but for which the fair value is disclosed Fair value hierarchy classifications, valuation technique and inputs for fair value measurements of the financial instruments not measured at fair value but for which the fair value is disclosed as of December 31, 2017 and December 31, 2018 are as follows: (In millions of won) December 31, 2017 Valuation technique Input Classification Level 1 Level 2 Level 3 Liabilities Secured bank borrowings W — — 642,172 Discounted cash flow Discount rate Unsecured bank borrowings — — 2,955,399 Discounted cash flow Discount rate Unsecured bond issues — — 2,016,086 Discounted cash flow Discount rate Other accounts payable — — 3,170,147 Discounted cash flow Discount rate (In millions of won) December 31, 2018 Valuation technique Input Classification Level 1 Level 2 Level 3 Liabilities Secured bank borrowings W — — 268,093 Discounted cash flow Discount rate Unsecured bank borrowings — — 6,013,903 Discounted cash flow Discount rate Unsecured bond issues — — 2,384,987 Discounted cash flow Discount rate The interest rates applied for determination of the above fair value at the reporting date are as follows: December 31, 2017 December 31, 2018 Borrowings, bonds and others 1.57~2.92% 2.09~3.37%

Changes in liabilities arising

Changes in liabilities arising from financing activities	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Changes in liabilities arising from financing activities	27. Changes in liabilities arising from financing activities Changes in liabilities arising from financing activities for the year ended December 31, 2018 are as follows: (In millions of won) Non-cash January 1, 2018 Cash flows from Reclassification Exchange rate effect Effective interest December 31, Short-term borrowings W — (720 ) — 720 — — Current portion of long-term borrowings and bonds 1,452,926 (1,859,098 ) 1,904,888 54,659 532 1,553,907 Long-term 2,644,189 3,882,958 (1,345,520 ) 50,644 — 5,232,271 Bonds 1,506,003 828,169 (559,368 ) (4,172 ) 1,967 1,772,599 W 5,603,118 2,851,309 — 101,851 2,499 8,558,777

Related Parties and Others

Related Parties and Others	12 Months Ended
	Dec. 31, 2018
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Related Parties and Others	28. Related Parties and Others (a) Related parties Related parties for the periods presented are as follows: Classification Description Associates(*) Paju Electric Glass Co., Ltd. and others Entity that has significant influence over the Controlling Company LG Electronics Inc. Subsidiaries of the entity that has significant influence over the Controlling Company Subsidiaries of LG Electronics Inc. (*) Details of associates are described in note 8. (b) Significant transactions such as sales of goods and purchases of raw material and outsourcing service and others, which occurred in the normal course of business with related parties for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 Purchase and others Sales and others Dividend Purchase of raw material Acquisition of Outsourcing Other costs Joint Venture Suzhou Raken Technology Co., Ltd.(*1) W 59,388 29,902 — — — 543 Associates and their subsidiaries New Optics Ltd. W 2,469 — 50,372 — 7,569 255 New Optics USA, Inc. — — — — 509 — NEWOPTIX RS. SA DE CV 33 — — — — — INVENIA Co., Ltd. 54 — 1,429 48,398 — 261 TLI Inc.(*2) — 101 57,429 — — 2,238 AVACO Co., Ltd.(*2) — 128 703 31,299 — 1,373 AVATEC Co., Ltd. — 265 — — 70,196 1,027 Paju Electric Glass Co., Ltd. — 21,030 453,463 — — 3,674 Shinbo Electric Co., Ltd. 204,637 — 355,607 — 2,449 1,097 Narenanotech Corporation 17 — 513 24,821 — 909 WooRee E&L Co., Ltd. — — — — — 32 YAS Co., Ltd. 44 — 2,076 80,836 — 1,758 LB Gemini New Growth Fund No. 16 — 8,394 — — — — W 207,254 29,918 921,592 185,354 80,723 12,624 ( In millions of won ) 2016 Purchase and others Sales and others Dividend Purchase of Acquisition of Outsourcing Other costs Entity that has significant influence over the Controlling Company LG Electronics Inc. W 1,580,279 — 23,047 538,175 — 103,158 Subsidiaries of the entity that has significant influence over the Controlling Company LG Electronics India Pvt. Ltd. W 75,591 — — — — 69 LG Electronics Vietnam Haiphong Co., Ltd. 162,893 — — — — 141 LG Electronics Nanjing New Technology Co., Ltd. 229,773 — — 293 — 1,876 LG Electronics RUS, LLC 127,316 — — — — 2,993 LG Electronics do Brasil Ltda. 133,903 — — — — 3,430 LG Innotek Co., Ltd. 11,503 — 209,878 — — 9,873 Qingdao LG Inspur Digital Communication Co., Ltd. 47,804 — — — — — Inspur LG Digital Mobile Communications Co., Ltd. 370,966 — — — — 5 LG Electronics Mexicalli, S.A. DE C.V. 210,021 — — — — 77 LG Electronics Mlawa Sp. z o.o. 709,558 — — — — 895 LG Electronics Taiwan Taipei Co., Ltd. 11,919 — — — — 27 ( In millions of won ) 2016 Sales and others Purchase and others Dividend Purchase of Acquisition of Outsourcing Other costs LG Electronics Wroclaw Sp. z o.o. W 290,785 — — — — 99 LG Hitachi Water Solutions Co., Ltd. — — — 167,987 — 2,782 LG Electronics Reynosa, S.A. DE C.V. 1,074,790 — — — — 1,907 LG Electronics Almaty Kazakhstan 15,953 — — — — 33 LG Electronics Air-Conditioning — — — 4,994 — 259 Hi Entech Co., Ltd. — — — — — 25,365 Hientech (Tianjin) Co., Ltd. — — — 28,587 — 10,613 LG Electronics S.A. (Pty) Ltd 21,236 — — — — 39 Others 2,289 — — — — 4,094 W 3,496,300 — 209,878 201,861 — 64,577 W 5,343,221 59,820 1,154,517 925,390 80,723 180,902 (*1) Represents transactions occurred prior to exchange of equity interests. (*2) Represent transactions occurred prior to disposal of the entire investments. ( In millions of won ) 2017 Sales and others Purchase and others Dividend Purchase of Acquisition of Outsourcing Other costs Associates and their subsidiaries New Optics Ltd.(*) W 1 — — — 4 6 INVENIA Co., Ltd. — — 1,862 66,548 — 2,259 AVATEC Co., Ltd. — 530 — — 90,785 720 Paju Electric Glass Co., Ltd. — 8,109 380,815 — — 4,225 Shinbo Electric Co., Ltd.(*) 15,812 — — — — 21 Narenanotech Corporation(*) — — 279 21,727 — 244 WooRee E&L Co., Ltd. — — — — — 175 YAS Co., Ltd. — — 6,347 69,243 — 2,474 W 15,813 8,639 389,303 157,518 90,789 10,124 Entity that has significant influence over the Controlling Company LG Electronics Inc. W 1,689,381 — 47,898 906,427 — 109,865 Subsidiaries of the entity that has significant influence over the Controlling Company LG Electronics India Pvt. Ltd. W 71,597 — — — — 163 LG Electronics Vietnam Haiphong Co., Ltd. 205,934 — — 8,892 — 198 ( In millions of won ) 2017 Sales and others Purchase and others Dividend Purchase of Acquisition of Outsourcing Other LG Electronics Nanjing New Technology Co., Ltd. W 300,785 — — 245 — 379 LG Electronics RUS, LLC 103,479 — — — — 963 LG Electronics do Brasil Ltda. 228,821 — — — — 430 LG Innotek Co., Ltd. 14,836 — 199,896 — — 5,692 Qingdao LG Inspur Digital Communication Co., Ltd. 77,787 — — — — — Inspur LG Digital Mobile Communications Co., Ltd. 230,832 — — — — — LG Electronics Mexicalli, S.A. DE C.V. 319,772 — — — — 186 LG Electronics Mlawa Sp. z o.o. 847,565 — — — — 985 LG Electronics Taiwan Taipei Co., Ltd. 13,693 — — — — 164 LG Hitachi Water Solutions Co., Ltd. — — — 318,978 — 1,532 LG Electronics Reynosa, S.A. DE C.V. 1,287,340 — — — — 1,926 LG Electronics Almaty Kazakhstan 14,079 — — — — 53 LG Electronics Air-Conditioning — — 255 3,744 — 2,621 HiEntech Co., Ltd. — — — 6,991 — 34,432 Hientech (Tianjin) Co., Ltd. — — — 21,838 — 11,822 LG Electronics S.A. (Pty) Ltd. 14,155 — — — — 25 Others 857 — 3 14 — 7,264 W 3,731,532 — 200,154 360,702 — 68,835 W 5,436,726 8,639 637,355 1,424,647 90,789 188,824 (*) Represents transactions occurred prior to disposal of the entire investments. ( In millions of won ) 2018 Sales and others Purchase and others Dividend Purchase of Acquisition of Outsourcing Other costs Associates and their subsidiaries INVENIA Co., Ltd. — 30 1,608 58,111 — 896 AVATEC Co., Ltd. — 530 — — 71,403 905 Paju Electric Glass Co., Ltd. — 4,172 364,183 — — 4,411 WooRee E&L Co., Ltd. — — 58 — — 144 YAS Co., Ltd. — — 5,281 143,192 — 3,391 LB Gemini New Growth Fund No. 16 1,112 540 — — — — W 1,112 5,272 371,130 201,303 71,403 9,747 Entity that has significant influence over the Controlling Company LG Electronics Inc. W 1,215,153 — 36,522 1,041,563 — 127,775 Subsidiaries of the entity that has significant influence over the Controlling Company LG Electronics India Pvt. Ltd. W 71,798 — — — — 103 LG Electronics Vietnam Haiphong Co., Ltd. 173,051 — — 4,541 — 166 ( In millions of won ) 2018 Sales and others Purchase and others Dividend Purchase of Acquisition of Outsourcing Other costs LG Electronics Nanjing New Technology Co., Ltd. W 223,524 — — 424 — 1,528 LG Electronics RUS, LLC 106,631 — — — — 2,673 LG Electronics do Brasil Ltda. 192,775 — — — — 350 LG Innotek Co., Ltd. 29,267 — 147,453 — — 39,136 Qingdao LG Inspur Digital Communication Co., Ltd. 37,738 — — — — — Inspur LG Digital Mobile Communications Co., Ltd. 131,970 — — — — 1 LG Electronics Mexicalli, S.A. DE C.V. 187,844 — — — — 210 LG Electronics Mlawa Sp. z o.o. 740,784 — — — — 631 LG Electronics Taiwan Taipei Co., Ltd. 12,746 — — — — 330 LG Hitachi Water Solutions Co., Ltd. 9,100 — — 304,365 — 8,980 LG Electronics Reynosa, S.A. DE C.V. 1,030,414 — — — — 2,021 LG Electronics Almaty Kazakhstan 3,759 — — — — 42 LG Electronics Air-Conditioning — — 330 26,871 — 7,264 HiEntech Co., Ltd. — — — 22,378 — 29,215 Hientech (Tianjin) Co., Ltd. — — — 92,900 — 23,880 LG Electronics S.A. (Pty) Ltd. 7,244 — — — — 20 LG Electronics Egypt S.A.E. 25,491 — — — — 16 Others 5,195 — 28 15 — 11,480 W 2,989,331 — 147,811 451,494 — 128,046 W 4,205,596 5,272 555,463 1,694,360 71,403 265,568 (c) Trade accounts and notes receivable and payable as of December 31, 2017and 2018 are as follows: ( In millions of won ) Trade accounts and notes receivable and others Trade accounts and notes payable and others December 31, 2017 December 31, 2018 December 31, 2017 December 31, 2018 Associates INVENIA Co., Ltd. 2,375 2,000 18,662 30,179 AVATEC Co., Ltd. — — 2,949 4,382 Paju Electric Glass Co., Ltd. — — 60,141 60,566 WooRee E&L Co., Ltd. — — 61 7 YAS Co., Ltd. 375 — 6,474 6,145 W 2,750 2,000 88,287 101,279 Entity that has significant influence over the Controlling Company LG Electronics Inc. W 550,335 247,679 257,071 430,677 Subsidiaries of the entity that has significant influence over the Controlling Company LG Electronics do Brasil Ltda. W 19,091 15,608 10 62 LG Electronics RUS, LLC 25,102 22,570 80 90 LG Innotek Co., Ltd. 407 2,885 62,675 47,382 Qingdao LG Inspur Digital Communication Co., Ltd. 13,061 3,530 — — Inspur LG Digital Mobile Communications Co., Ltd. 55,278 13,172 — — ( In millions of won ) Trade accounts and notes receivable and others Trade accounts and notes payable and others December 31, 2017 December 31, 2018 December 31, 2017 December 31, 2018 LG Electronics Mexicali, S.A. DE C.V. W 29,440 15,305 — — LG Electronics Mlawa Sp. z o.o. 136,874 70,236 25 33 LG Electronics Nanjing New Technology Co., Ltd. 46,373 43,463 699 139 LG Electronics Reynosa, S.A. DE C.V. 137,413 69,189 82 134 LG Electronics Vietnam Haiphong Co., Ltd. 36,017 25,544 3,917 — LG Hitachi Water Solutions Co., Ltd. — 9,100 154,864 50,425 Hientech (Tianjin) Co., Ltd. — — 5,600 16,345 HiEntech Co., Ltd. — — 6,679 16,816 LG Electronics India Pvt. Ltd. 3,030 9,047 — 29 LG Electronics Egypt S.A.E. — 10,296 1 — LG Electronics Air-Conditioning — — — 17,654 Others 7,618 5,263 1,714 1,246 W 509,704 315,208 236,346 150,355 W 1,062,789 564,887 581,704 682,311 (d) Details of significant cash transactions such as loans and collection of loans, which occurred in the normal course of business with related parties for the years ended December 31, 2017 and 2018 are as follows: (In millions of won) Loans(*1) Associates January 1, 2017 Increase Decrease December 31, 2017 New Optics Ltd.(*2) W 1,000 — 125 875 INVENIA Co., Ltd. 833 2,000 458 2,375 Narenanotech Corporation(*2) 300 — 75 225 YAS Co., Ltd. 833 — 458 375 W 2,966 2,000 1,116 3,850 (*1) Loans are presented based on nominal amounts. (*2) Excluded from related parties due to disposal of equity investments during the year ended December 31, 2017. (In millions of won) Loans(*) Associates January 1, 2018 Increase Decrease December 31, 2018 INVENIA Co., Ltd. W 2,375 — 375 2,000 YAS Co., Ltd. 375 — 375 — W 2,750 — 750 2,000 (*) Loans are presented based on nominal amounts. (e) Key management personnel compensation Compensation costs of key management for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Short-term benefits W 2,323 3,724 2,622 Expenses related to the defined benefit plan 897 488 794 W 3,220 4,212 3,416 Key management refers to the registered directors who have significant control and responsibilities over the Controlling Company’s operations and business.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2018
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Supplemental Cash Flow Information	29. Supplemental Cash Flow Information Supplemental cash flow information for the years ended December 31, 2016, 2017 and 2018 is as follows: (In millions of won) 2016 2017 2018 Non-cash Changes in other accounts payable arising from the purchase of property, plant and equipment W 809,406 632,355 516,734

Non-current Assets Held for Sal

Non-current Assets Held for Sale	12 Months Ended
	Dec. 31, 2018
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Non-current Assets Held for Sale	30. Non-current The Group plans to dispose a part of tangible assets of LG Display Poland Sp. z o.o. based on the management’s approval and began effort to sell the disposal group. The Group expects to complete the sale within the first half of 2019. (1) impairment loss of disposal group Fair value less costs to sell of disposal group is expected to exceed the carrying amount and no impairment loss is recognized to the non-current (2) assets of disposal group Non-current (In millions of won) December 31, 2018 Property, plant and equipment W 70,161

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
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Change in Accounting Policies	(a) Changes in Accounting Policies The Group has initially adopted IFRS 9, Financial Instruments, Revenue from Contracts with Customers Foreign Currency Transactions and Advance Consideration The Group has consistently applied the accounting policies to the consolidated financial statements for 2018 and 2017 except for the new amendments effective for annual period beginning January 1, 2018 as mentioned below. (i) IFRS 9, Financial Instruments IFRS 9 set out requirements for recognizing and measuring financial assets, financial liabilities and some contracts to buy or sell non-financial Financial Instruments: Recognition and Measurement Financial Instruments The followings describe the nature and impact on the significant changes in accounting policies from the adoption of IFRS 9. There is no impact on the opening balance of retained earnings at January 1, 2018 resulting from the initial adoption of IFRS 9. Classification and measurement of financial assets and financial liabilities IFRS 9 contains three principal classification categories for financial assets measured at: amortized cost, FVOCI and FVTPL. The classification of financial assets under IFRS 9 is generally based on the business model in which a financial asset is managed and its contractual cash flow characteristics. IFRS 9 eliminates the previous IAS 39 categories of held to maturity, loans and receivables and available for sale. IFRS 9 largely retains the existing requirements in IAS 39 for the classification and measurement of financial liabilities. The adoption IFRS 9 has not had a significant effect on the Group’s accounting policies related to financial liabilities and derivative financial instruments. The following table below explains the original measurement categories under IAS 39 and the changes in measurement categories under IFRS 9 for each class of the Group’s financial assets as at January 1, 2018. ( In millions of won ) Classification under IAS 39 Classification IFRS 9 Carrying amount IAS 39 Carrying amount IFRS 9 Difference Financial assets Cash and cash equivalents Loans and receivables Amortized cost W 2,602,560 2,602,560 — Deposits Loans and receivables Amortized cost 758,089 758,089 — Trade receivables Loans and receivables Amortized cost 4,325,120 4,325,120 — Other receivables Loans and receivables Amortized cost 173,565 173,565 — Debt instrument Available-for-sale FVOCI-debt 162 162 — Equity instrument Available-for-sale Mandatorily at FVTPL 4,980 4,980 — Convertible bonds Designated as at Mandatorily at 1,552 1,552 — Derivatives Designated as at Mandatorily at 842 842 — Others Loans and receivables Amortized cost 79,552 79,552 — Total financial assets W 7,946,422 7,946,422 — As of January 1, 2018, there was no financial liabilities measured at FVTPL. Impairment of financial assets IFRS 9 replaces the ‘incurred loss’ model in IAS 39 with an ‘expected credit loss’ (ECL) model. The new impairment model applies to financial assets measured at amortized cost, contract assets and debt investments at FVOCI, but not to investments in equity instruments. Under IFRS 9, credit losses are recognized earlier than under IAS 39. As a result of applying the new impairment model under IFRS 9, as of January 1, 2018, there is no additional allowance for impairments recognized as compared with the impairment model under IAS 39. Hedge Accounting When initially applying IFRS 9, the Group has elected as its accounting policy to continue to apply hedge accounting requirements under IAS 39 and as a result, there is no impact of applying IFRS 9 on the consolidated financial statements as at January 1, 2018. (ii) IFRS 15, Revenue from Contracts with Customers IFRS 15, Revenue from contracts with customers Revenue Construction Contracts SIC-31, Revenue: Barter Transactions Involving Advertising Services Customer Loyalty Programmes Agreements for the Construction of Real Estate Transfers of Assets from Customers The Group has initially adopted IFRS 15, Revenue from contracts with customers W The effect of the application of IFRS 15 on the Group’s consolidated statement of financial position as of December 31, 2018 is as follows. There is no significant impact on the consolidated statement of comprehensive income and the cash flows for the year ended December 31, 2018. (In millions of won) Categories As reported Adjustments Amounts without Current Assets Other current assets W 546,048 (7,489 ) 538,559 Current Liabilities Provisions W 98,254 (7,489 ) 90,765 (iii) IFRIC 22, Foreign Currency Transactions and Advance Consideration According to the new interpretation, IFRIC 22, Foreign Currency Transactions and Advance Consideration non-monetary non-monetary
Consolidation	(b) Consolidation (i) Business combinations The Group accounts for business combinations using the acquisition method when control is transferred to the Group. The consideration transferred in the acquisition is generally measured at fair value, as are the identifiable net assets acquired. Any goodwill that arises is tested annually for impairment. Any gain on a bargain purchase is recognized in profit or loss immediately. Transaction costs are expensed as incurred, except if related to the issue of debt or equity securities in accordance with IAS 32 and IFRS 9. The consideration transferred does not include amounts related to the settlement of pre-existing (ii) Subsidiaries Subsidiaries are entities controlled by the Group. The Group controls an entity when it is exposed, or has right to, variable returns from its involvement with the entity and has the ability to affect those returns through its power over the entity. The financial statements of subsidiaries are included in the consolidated financial statements from the date on which control commences until the date on which control ceases. (iii) Non-controlling interests Non-controlling Changes in the Group’s interest in subsidiaries that do not result in a loss of control are accounted for as equity transactions. (iv) Loss of control If the Controlling Company loses control of subsidiaries, the Controlling Company derecognizes the assets and liabilities of the former subsidiaries from the consolidated statement of financial position and recognizes the gain or loss associated with the loss of control attributable to the former controlling interest. Meanwhile, the Controlling Company recognizes any investment retained in the former subsidiaries at its fair value when control is lost. (v) Associates and joint ventures (equity method investees) Associates are those entities in which the Group has significant influence, but not control or joint control, over the financial and operating policies. A joint venture is an arrangement in which the Group has joint control, whereby the Group has rights to the net assets of the arrangement, rather than rights to its assets and obligations for its liabilities. Investments in associates and joint ventures are initially recognized at cost and subsequently accounted for using the equity method of accounting. The carrying amount of investments in associates and joint ventures is increased or decreased to recognize the Group’s share of the profits or losses and changes in the Group’s proportionate interest of the investee after the date of acquisition. Distributions received from an investee reduce the carrying amount of the investment. If an associate or joint ventures uses accounting policies different from those of the Controlling Company for like transactions and events in similar circumstances, appropriate adjustments are made to the consolidated financial statements. As of and during the periods presented in the consolidated financial statements, no adjustments were made in applying the equity method. When the Group’s share of losses exceeds its interest in an equity accounted investee, the carrying amount of that interest, including any long-term investments, is reduced to nil, and the recognition of further losses is discontinued except to the extent that the Group has an obligation or has made payments on behalf of the investee. (vi) Transactions eliminated on consolidation Intra-group balances and transactions, including income and expenses and any unrealized income and expenses and balance of trade accounts and notes receivable and payable arising from intra-group transactions, are eliminated. Unrealized gains arising from transactions with equity-accounted investees are eliminated against the investment to the extent of the Group’s interest in the investee. Unrealized losses are eliminated in the same way as unrealized gains, but only to the extent that there is no evidence of impairment.
Foreign Currency Transaction and Translation	(c) Foreign Currency Transaction and Translation Transactions in foreign currencies are translated to the respective functional currencies of the Group at exchange rates at the dates of the transactions. Monetary assets and liabilities denominated in foreign currencies are retranslated to the functional currency at the exchange rate on the reporting date. Non-monetary Non-monetary non-operating If the presentation currency of the Group is different from a foreign operation’s functional currency, the financial position and financial performance of the foreign operation are translated into the presentation currency using the following methods. The assets and liabilities of foreign operations, whose functional currency is not the currency of a hyperinflationary economy, including goodwill and fair value adjustments arising on acquisition, are translated to the Group’s functional currency at exchange rates at the reporting date. The income and expenses of foreign operations are translated to the Group’s functional currency at exchange rates at the dates of the transactions. Foreign currency differences are recognized in other comprehensive income. However, if the operation is a non-wholly-owned non-controlling Any goodwill arising on the acquisition of a foreign operation and any fair value adjustments to the carrying amounts of assets and liabilities arising on the acquisition of that foreign operation is treated as assets and liabilities of the foreign operation. Thus, they are expressed in the functional currency of the foreign operation and translated at the at each reporting date’s exchange rate.
Cash and cash equivalents	(d) Cash and Cash Equivalents Cash and cash equivalents include all cash balances and short-term highly liquid investments with an original maturity of three months or less that are readily convertible into known amounts of cash.
Inventories	(e) Inventories Inventories are measured at the lower of cost and net realizable value. The cost of inventories is based on the weighted-average method, and includes expenditures incurred in acquiring the inventories, production or conversion costs and other costs incurred in bringing them to their existing location and condition. Net realizable value is the estimated selling price in the ordinary course of business less the estimated costs of completion and the estimated selling expenses. In the case of manufactured inventories and work-in-process, cost includes an appropriate share of production overheads based on the actual capacity of production facilities. However, the normal capacity is used for the allocation of fixed production overheads if the actual level of production is lower than the normal capacity.
Financial Instruments	(f) Financial Instruments (i) Non-derivative Recognition and initial measurement Trade receivables and debt securities issued are initially recognized when they are originated. All other financial assets or liabilities are recognized in statement of financial position when, and only when, the Group becomes a party to the contractual provisions of the instrument. A financial asset (unless it is a trade receivable without a significant financing component) or financial liability is initially measured at fair value plus, for an item not at FVTPL, transaction costs that are directly attributable to its acquisition or issue. A trade receivable without a significant financing component is initially measured at the transaction price. Classification and subsequent measurement i) Financial assets: Policy applicable from January 1, 2018 On initial recognition, a financial asset is classified as measured at: amortized cost; FVOCI – debt investment; FVOCI – equity investments; or FVTPL. Financial assets are not reclassified subsequent to their initial recognition unless the Group changes its business model for managing financial assets, in which case all affected financial assets are reclassified on the first day of the first reporting period following the change in the business model. A financial asset is measured at amortized cost if it meets both of the following conditions and is not designated at FVTPL: • it is held within a business model whose objective is to hold assets to collect contractual cash flows; and • its contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. A debt investment is measured at FVOCI if it meets both of the following conditions and is not designated as at FVTPL: • it is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets; and • the contractual terms give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. On initial recognition of an equity investments that is not held for trading, the Group may irrevocably elect to present subsequent changes in the investment’s fair value in OCI. This election is made on an investment-by-investment All financial assets not classified as measured at amortized cost or FVOCI as described above are measured at FVTPL. This includes all derivative financial assets. At initial recognition, the Group may irrevocably designate a financial asset that otherwise meets the requirements to be measured at amortized cost or at FVOCI as at FVTPL if doing so eliminates or significantly reduces an accounting mismatch that would otherwise arise. ii) Financial assets: business model: Policy applicable from January 1, 2018 The Group makes an assessment of the objective of the business model in which a financial asset is held at a portfolio level because this best reflects the way the business is managed and information is provided to management. The information considered includes: • the stated policies and objectives for the portfolio and the operation of those policies in practice. These include whether management’s strategy focuses on earning contractual interest income, maintaining a particular interest rate profile, matching the duration of the financial assets to the duration of any related liabilities or expected cash outflows or realizing cash flows through the sale of the assets; • how the performance of the portfolio is evaluated and reported to the Group’s management; • the risks that affect the performance of the business model (and the financial assets held within that business model) and how those risks are managed; • how managers of the business are compensated – e.g. whether compensation is based on the fair value of the assets managed or the contractual cash flows collected; and • the frequency, volume and timing of sales of financial assets in prior periods, the reasons for such sales and expectations about future sales activity. Transfers of financial asset to third parties in transaction that do not qualify for derecognition are not considered sale for this purpose. A financial assets that are held for trading or are managed and whose performance is evaluated on a fair value basis are measured at FVTPL. iii) Financial assets: Assessment whether contractual cash flows are solely payments of principal and interest: Policy applicable from January 1, 2018 For the purpose of this assessment, “principal” is defined as the fair value of the financial asset on initial recognition. ‘Interest’ is defined as consideration for the time value of money and for the credit risk associated with the principal amount outstanding during a particular period of time and for other basic lending risks and cost (e.g. liquidity risk and administrative costs), as well as profit margin. In assessing whether the contractual cash flows are solely payments of principal and interest, the Group considers the contractual terms of the instrument. This includes assessing whether the financial asset contains a contractual term that could change the timing or amount of contractual cash flows such that it would not meet this condition. In making this assessment, the Group considers. • contingent events that would change the amount or timing of cash flows: • terms that may adjust the contractual coupon rate, including variable-rate features; • prepayment and extension features; and • terms that limit the Group’s claim to cash flows from specified assets (e.g. non-recourse A prepayment feature is consistent with the solely payments of principal and interest criterion if the prepayment amount substantially represents unpaid amounts of principal and interest or the principal amount outstanding, which may include reasonable additional compensation for early termination of the contract. Additionally, for a financial asset acquired at a discount or premium to its contractual par amount, a feature that permits or requires prepayment at an amount that substantially represents the contractual par amount plus accrued (but unpaid) contractual interest (which may also include reasonable additional compensation for early termination) is treated as consistent with this criterion if the fair value of the prepayment feature is insignificant at initial recognition. iv) Financial assets: Subsequent measurement and gains and losses: Policy applicable from January 1, 2018 Financial assets at FVTPL These assets are subsequently measured at fair value. Net gains and losses, including any interest or dividend income, are recognized in profit or loss. Financial assets at amortized cost These assets are subsequently measured at amortized cost using the effective interest method. The amortized cost is reduced by impairment losses. Interest income, foreign exchange gains and losses and impairment are recognized in profit or loss. Any gain or loss on derecognition is recognized in profit or loss. Debt investments at FVOCI These assets are subsequently measured at fair value. Interest income calculated using the effective interest method, foreign exchange gains and losses and impairment are recognized in profit or loss. Other net gains and losses are recognized in OCI. On derecognition, gains and losses accumulated in OCI are reclassified to profit or loss. v) Financial assets: Policy applicable before January 1, 2018 The Group has classified financial assets into one of the following categories • loans and receivables • available-for-sale • at FVTPL vi) Financial assets: subsequent measurement, gains and losses: Policy applicable before January 1, 2018 Financial assets at FVTPL Measured at fair value and changes therein, including any interest or dividend income, were recognized in profit or loss. Loans and receivables Measured at amortized cost using the effective interest method. Available-for-sale Measured at fair value and changes therein, other than impairment losses, interest income and foreign currency differences on debt instruments, were recognized in OCI and accumulated in the fair value reserves. When these assets were derecognized, the gain or loss accumulated in equity was classified to profit or loss. Derecognition The Group derecognizes a financial asset when the contractual rights to the cash flows from the asset expire, it transfers the rights to receive the contractual cash flows of the financial asset in a transaction in which substantially all the risks and rewards of ownership of the financial asset are transferred, or it transfers or does not retain substantially all the risks and rewards of ownership of a transferred asset, and does not retain control of the transferred asset. If the Group has retained substantially all the risks and rewards of ownership of the transferred asset, the Group continue to recognize the transferred asset. Offset Financial assets and liabilities are offset and the net amount presented in the consolidated statement of financial position when, and only when, the Group has a legal right to offset the amounts and intends either to settle them on a net basis or to realize the asset and settle the liability simultaneously. (ii) Non-derivative The Group classifies financial liabilities into two categories, financial liabilities at FVTPL and other financial liabilities, in accordance with the substance of the contractual arrangement and the definitions of financial liabilities, and recognizes them in the consolidated statement of financial position when the Group becomes a party to the contractual provisions of the instrument. Financial liabilities at FVTPL include financial liabilities held for trading or designated as such upon initial recognition at FVTPL. After initial recognition, financial liabilities at FVTPL are measured at fair value, and changes therein are recognized in profit or loss. Upon initial recognition, transaction costs that are directly attributable to the issuance of financial liabilities are recognized in profit or loss as incurred. Non-derivative non-derivative The Group derecognizes a financial liability when its contractual obligations are discharged, cancelled or expired. (iii) Share capital The Group only issued common stocks and they are classified as equity. Incremental costs directly attributable to the issuance of common stocks are recognized as a deduction from equity, net of tax effects. Capital contributed in excess of par value upon issuance of common stocks is classified as share premium within equity. (iv) Derivative financial instruments Derivatives are initially recognized at fair value. Subsequent to initial recognition, derivatives are measured at fair value, and changes therein are accounted for as described below. Hedge accounting If necessary, the Group designates derivatives as hedging items to hedge the risk of changes in the fair value of assets, liabilities or firm commitments (a fair value hedge) and foreign currency risk of highly probable forecasted transactions or firm commitments (a cash flow hedge). On initial designation of the hedge, the Group’s management formally designates and documents the relationship between the hedging instrument(s) and hedged item(s), including the risk management objectives and strategy in undertaking the hedge transaction, together with the methods that will be used to assess the effectiveness of the hedging relationship, both at the inception of the hedge relationship as well as on an ongoing basis. i) Fair value hedges Change in the fair value of a derivative hedging instrument designated as a fair value hedge and the hedged item is recognized in profit or loss, respectively. The gain or loss from remeasuring the hedging instrument at fair value and the gain or loss on the hedged item attributable to the hedged risk are recognized in profit or loss in the same line item of the statement of comprehensive income. The Group discontinues fair value hedge accounting if it does not designate the derivative hedging instrument and the hedged item as the hedge relationship between them anymore or if the hedging instrument expires or is sold, terminated or exercised, or if the hedge no longer meets the criteria for hedge accounting. Any adjustment arising from gain or loss on the hedged item attributable to the hedged risk is amortized to profit or loss from the date the hedge accounting is discontinued. ii) Cash flow hedges When a derivative designated as a cash flow hedging instrument meets the criteria of cash flow hedge accounting, the effective portion of changes in the fair value of the derivative is recognized in other comprehensive income and the ineffective portion of changes in the fair value of the derivative is recognized in profit or loss. The Group discontinues cash flow hedge accounting if it does not designate the derivative hedging instrument and the hedged item as the hedge relationship between them anymore or if the hedging instruments expires or is sold, terminated or exercised, or if the hedge no longer meets the criteria for hedge accounting. The cumulative gain or loss on the hedging instrument that has been recognized in other comprehensive income is reclassified to profit or loss in the periods during which the forecasted transaction occurs. If the forecasted transaction is no longer expected to occur, then the balance in other comprehensive income is recognized immediately in profit or loss. Embedded derivative Embedded derivatives are separated from the host contract and accounted for separately if the host contract is not a financial asset and certain criteria are met. Other derivative financial instruments Derivative financial instruments are measured at fair value and changes of them not designated as a hedging instrument or not effective for hedging are recognized in profit or loss.
Property, Plant and Equipment	(g) Property, Plant and Equipment (i) Recognition and measurement Items of property, plant and equipment are measured at cost less accumulated depreciation and accumulated impairment losses. Cost includes an expenditure that is directly attributable to the acquisition of the asset. The cost of self-constructed assets includes the cost of materials and direct labor, any costs directly attributable to bringing the assets to a working condition for their intended use, the costs of dismantling and removing the items and restoring the site on which they are located and borrowing costs on qualifying assets. The gain or loss arising from the derecognition of an item of property, plant and equipment is determined as the difference between the net disposal proceeds, if any, and the carrying amount of the item and recognized in other non-operating non-operating (ii) Subsequent costs Subsequent expenditure on an item of property, plant and equipment is recognized as part of its cost only if it is probable that future economic benefits associated with the item will flow to the Group and the cost of the item can be measured reliably. The costs of the day-to-day (iii) Depreciation Depreciation is recognized in profit or loss on a straight-line basis, reflecting the pattern in which the asset’s future economic benefits are expected to be consumed by the Group. The residual value of property, plant and equipment is zero. Land is not depreciated. Estimated useful lives of the assets are as follows: Useful lives (years) Buildings and structures 20, 40 Machinery 4, 5 Furniture and fixtures 4 Equipment, tools and vehicles 2, 4, 12 Depreciation methods, useful lives and residual values are reviewed at each financial year-end During the year ended December 31, 2018, the Group changed estimated useful lives of the mask and mold which had previously been classified as inventories. Based on the review of the accumulated historical usage information that became available, it is expected that the mask and mold will be used for the period exceeding one year. Accordingly, the Group changed useful lives of Mask and Mold to two years accounted for the change in accounting estimate and reclassified the mask and mold to property, plant and equipment from inventories. As a result of such change, the Group reclassified inventories amounting to W (In millions of won) Description 2018 2019 2020 Increase (decrease) in depreciation expense W (110,373 ) 58,364 52,009
Borrowing Costs	(h) Borrowing Costs The Group capitalizes borrowing costs, which includes interests and exchange differences arising from foreign currency borrowings to the extent that they are regarded as an adjustment to interest costs, directly attributable to the acquisition, construction or production of a qualifying asset as part of the cost of that asset. A qualifying asset is an asset that necessarily takes a substantial period of time to get ready for its intended use or sale. To the extent that the Group borrows funds specifically for the purpose of obtaining a qualifying asset, the Group determines the amount of borrowing costs eligible for capitalization as the actual borrowing costs incurred on that borrowing during the period less any investment income on the temporary investment of those borrowings. The Group immediately recognizes other borrowing costs as an expense.
Government Grants	(i) Government Grants In case there is reasonable assurance that the Group will comply with the conditions attached to a government grant, the government grant is recognized as follows: (i) Grants related to the purchase or construction of assets A government grant related to the purchase or construction of assets is deducted in calculating the carrying amount of the asset. The grant is recognized in profit or loss over the life of a depreciable asset as a reduced depreciation expense and cash related to grant received is presented in investing activities in the statement of cash flows. (ii) Grants for compensating the Group’s expenses incurred A government grant that compensates the Group for expenses incurred is recognized in profit or loss as a deduction from relevant expenses on a systematic basis in the periods in which the expenses are recognized. (iii) Other government grants A government grant that becomes receivable for the purpose of giving immediate financial support to the Group with no compensation for expenses or losses already incurred or no future related costs is recognized as income of the period in which it becomes receivable.
Intangible Assets	(j) Intangible Assets Intangible assets are initially measured at cost. Subsequently, intangible assets are measured at cost less accumulated amortization and accumulated impairment losses. (i) Goodwill Goodwill arising from business combinations is recognized as the excess of the acquisition cost of investments in subsidiaries, associates and joint ventures over the Group’s share of the net fair value of the identifiable assets acquired and liabilities assumed. Any deficit is a bargain purchase that is recognized in profit or loss. Goodwill is measured at cost less accumulated impairment losses. (ii) Research and development Expenditure on research activities, undertaken with the prospect of gaining new scientific or technical knowledge and understanding, is recognized in profit or loss as incurred. Development activities involve a plan or design of the production of new or substantially improved products and processes. Development expenditure is capitalized only if the Group can demonstrate all of the following: • the technical feasibility of completing the intangible asset so that it will be available for use or sale, • its intention to complete the intangible asset and use or sell it, • its ability to use or sell the intangible asset, • how the intangible asset will generate probable future economic benefits. Among other things, the Group can demonstrate the existence of a market for the output of the intangible asset or the intangible asset itself or, if it is to be used internally, the usefulness of the intangible asset, • the availability of adequate technical, financial and other resources to complete the development and to use or sell the intangible asset, and • its ability to measure reliably the expenditure attributable to the intangible asset during its development. The expenditure capitalized includes the cost of materials, direct labor, overhead costs that are directly attributable to preparing the asset for its intended use, and borrowing costs on qualifying assets. (iii) Other intangible assets Other intangible assets include intellectual property rights, software, customer relationships, technology, memberships and others. (iv) Subsequent costs Subsequent expenditure is capitalized only when it increases the future economic benefits embodied in the specific intangible asset to which it relates. All other expenditure, including expenditure on internally generated goodwill and brands, is recognized in profit or loss as incurred. (v) Amortization Amortization is calculated on a straight-line basis over the estimated useful lives of intangible assets, other than goodwill, from the date that they are available for use. The residual value of intangible assets is zero. However, as there are no foreseeable limits to the periods over which condominium and golf club memberships are expected to be available for use, these intangible assets are regarded as having indefinite useful lives and not amortized. Estimated useful lives (years) Intellectual property rights 5, 10 Rights to use electricity, water and gas supply facilities 10 Software 4 Customer relationships 7, 10 Technology 10 Development costs (*) Condominium and golf club memberships Not amortized (*) Capitalized development costs are amortized over the useful life considering the life cycle of the developed products. Amortization of capitalized development costs is recognized in research and development expenses in the consolidated statement of comprehensive income. Amortization periods and the amortization methods for intangible assets with finite useful lives are reviewed at each financial year-end.
Impairment	(k) Impairment (i) Financial assets Financial instruments and contract assets: Policy applicable from January 1, 2018 The Group recognizes loss allowance for financial assets measured at amortized cost and debt investments at FVOCI at the ‘expected credit loss’ (ECL). The Group recognizes a loss allowance for the life-time expected credit losses except for following, which are measured at 12-month • debt securities that are determined to have low credit risk at the reporting date; and • other debt securities and bank securities for which credit risk (i.e. the risk of default occurring over the expected life of the financial instrument) has not increased significantly since initial recognition. When determining whether the credit risk of a financial asset has increased significantly since initial recognition and when estimating ECLs, the Group considers reasonable and supportable information that is relevant and available without undue cost or effort. This includes both qualitative and quantitative information and analysis, based on the Group’s historical experience and informed credit assessment including forward-looking information. Lifetime ECLs are the ECLs that result from all possible default events over the expected life of a financial instrument. 12-month The maximum period considered when estimating ECLs is the maximum contractual period over which the Group is exposed to credit risk. Estimation of expected credit losses: Policy applicable from January 1, 2018 Expected credit losses are a probability-weighted estimate of credit losses (i.e. the present value of all cash shortfalls) over the expected life of the financial instrument. Credit losses are measured using the present value of a cash shortfall (the difference between the contractual cash flows and the expected contractual cash flows). The expected credit losses are discounted using effective interest rate of the financial assets. Credit-impaired financial assets: Policy applicable from January 1, 2018 At each reporting period-end, Evidence that a financial asset is credit-impaired includes the following observable data: • significant financial difficulty of the issuer or the borrower; • the restructuring of a loan or advance by the Group on terms that the Group would not consider otherwise; • it is probable that the borrower will enter bankruptcy or other financial reorganization; or • the disappearance of an active market for a security because of financial difficulties; Presentation of loss allowance for ECL in the statement of financial position: Policy applicable from January 1, 2018 Loss allowances for financial assets measured at amortized cost are deducted from the gross carrying amount of the assets. For debt securities at FVOCI, the loss allowance is charged to profit or loss and is recognized in OCI. Write-off: 1, 2018 The gross carrying amount of a financial asset is written off when the Group has no reasonable expectations for recovering a financial asset in its entirety or a portion thereof. The Group assess whether there are reasonable expectations of recovering the contractual cash flows from customers and individually assess the timing and amount of write-off. written-off. Non-derivative financial assets: Policy applicable before January 1, 2018 Financial assets not classified as at FVTPL were assessed at each reporting date to determine whether there was objective evidence of impairment. Objective evidence that financial assets were impaired included: • default or delinquency by a debtor; • restructuring of an amount due to the Group on terms that the Group would not consider otherwise • indications that a debtor or issuer would enter bankruptcy • adverse changes in the payment status of borrowers or issuers; • the disappearance of an active market for a security because of financial difficulties • observable data indicating that there was measurable decrease in the expected cash flows from a group of financial assets. For an investment in an equity instrument, objective evidence of impairment include a significant or prolonged decline in its fair value below its cost. Financial assets at amortized cost The Group considered evidence of impairment for these assets at both collective level and individual asset. All individual significant assets were individually assessed for impairment. Those found not to be impaired were then collectively assessed for any impairment that had been incurred but not yet individually identified. Assets that were not individually significant were collectively assessed for impairment. Collective assessment was carried out by grouping together assets with similar risk characteristics. In assessing collective impairment, the Group used historical information on the timing of recoveries and the amount of loss incurred and made an adjustment if current economic and credit conditions were such that the actual losses were likely to be greater or lesser than suggested by historical trends. An impairment loss was calculated as the difference between an asset’s carrying amount and the present value of the estimated future cash flows discounted at the asset’s original effective interest rate. Losses were recognized in profit or loss and reflected in an allowance account. For financial assets such as equity instruments which the carrying amount would be the cost, the impairment loss is the difference between the carrying value and the present value of estimated future cash receipts of a similar financial instruments discounted at current market rate. The impairment loss is recognized as profit and losses and would be not reversed as profit and losses. Available-for-sale financial assets For the financial assets classified as available-for-sale If the fair value of an impaired available-for-sale available-for-sale (ii) Non-financial The carrying amounts of the Group’s non-financial For the purpose of impairment testing, assets that cannot be tested individually are grouped together into the smallest group of assets that generates cash inflows from continuing use that are largely independent of the cash inflows of other assets or groups of assets (the “cash-generating unit”, or “CGU”). The recoverable amount of an asset or cash-generating unit is determined as the greater of its value in use and its fair value less costs to sell. In assessing value in use, the estimated future cash flows are discounted to their present value using a pre-tax An impairment loss is recognized if the carrying amount of an asset or its CGU exceeds its estimated recoverable amount. Impairment losses are recognized in profit or loss. Goodwill acquired in a business combination is allocated to CGUs that are expected to benefit from the synergies of the combination. Impairment losses recognized in respect of a CGU are allocated first to reduce the carrying amount of any goodwill allocated to the unit, and then to reduce the carrying amounts of the other assets in the unit on a pro rata basis. In respect of other assets, impairment losses recognized in prior periods are assessed at each reporting date for any indications that the loss has decreased or no longer exists. An impairment loss is reversed if there has been a change in the estimates used to determine the recoverable amount. An impairment loss is reversed only to the extent that the asset’s carrying amount does not exceed the carrying amount that would have been determined, net of accumulated depreciation or amortization, if no impairment loss had been recognized. An impairment loss in respect of goodwill is not reversed.
Provisions	(l) Provisions A provision is recognized if, as a result of a past event, the Group has a present legal or constructive obligation that can be estimated reliably, and it is probable that an outflow of economic benefits will be required to settle the obligation. The risks and uncertainties that inevitably surround events and circumstances are taken into account in reaching the best estimate of a provision. Where the effect of the time value of money is material, provisions are determined at the present value of the expected future cash flows. The unwinding of the discount is recognized as finance cost. Provisions are reviewed at the end of each reporting period and adjusted to reflect the current best estimate. If it is no longer probable that an outflow of resources embodying economic benefits will be required to settle the obligation, the provision is reversed. The Group recognizes a liability for warranty obligations based on the estimated costs expected to be incurred under its basic limited warranty. This warranty covers defective products and is normally applicable for eighteen months from the date of purchase. These liabilities are accrued when product revenues are recognized. Factors that affect the Group’s warranty liability include historical and anticipated rates of warranty claims on those repairs and cost per claim to satisfy the Group’s warranty obligation. Warranty costs primarily include raw materials and labor costs. As these factors are impacted by actual experience and future expectations, management periodically assesses the adequacy of its recorded warranty liabilities and adjusts the amounts as necessary. Accrued warranty obligations are included in the current and non-current Liabilities for loss contingencies arising from claims, assessments, litigation, fines, and penalties and other sources, are recorded when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated.
Non-current Assets Held for Sale	(m) Non-current Non-current held-for-sale non-current held-for-sale The Group does not depreciate a non-current
Employee Benefits	(n) Employee Benefits (i) Short-term employee benefits Short-term employee benefits that are due to be settled within twelve months after the end of the period in which the employees render the related service are recognized in profit or loss on an undiscounted basis. The expected cost of profit-sharing and bonus plans and others are recognized when the Group has a present legal or constructive obligation to make payments as a result of past events and a reliable estimate of the obligation can be made. (ii) Other long-term employee benefits The Group’s net obligation in respect of long-term employee benefits other than pension plans is the amount of future benefit that employees have earned in return for their service in the current and prior periods. (iii) Defined contribution plan A defined contribution plan is a post-employment benefit plan under which an entity pays fixed contributions into a separate entity and will have no legal or constructive obligation to pay further amounts. Obligations for contributions to defined contribution pension plans are recognized as an employee benefit expense in profit or loss in the periods during which services are rendered by employees. (iv) Defined benefit plan A defined benefit plan is a post-employment benefit plan other than defined contribution plans. The Group’s net obligation in respect of its defined benefit plan is calculated by estimating the amount of future benefit that employees have earned in return for their service in the current and prior periods; that benefit is discounted to determine its present value. The fair value of any plan assets is deducted. The calculation is performed annually by an independent actuary using the projected unit credit method. The discount rate is the yield at the reporting date on high quality corporate bonds that have maturity dates approximating the terms of the Group’s obligations and that are denominated in the same currency in which the benefits are expected to be paid. The Group recognizes all actuarial gains and losses arising from defined benefit plans in retained earnings immediately. The Group determines the net interest expense (income) on the net defined benefit liability (asset) for the period by applying the discount rate used to measure the defined benefit obligation at the beginning of the annual period to the then-net When the benefits of a plan are changed or when a plan is curtailed, the resulting change in benefit that relates to past service or the gain or loss on curtailment is recognized immediately in profit or loss. The Group recognizes gains and losses on the settlement of a defined benefit plan when the settlement occurs. (v) Termination benefits The Group recognizes expense for termination benefits at the earlier of the date when the entity can no longer withdraw the offer of those benefits and when the entity recognizes costs for a restructuring that is within the scope of IAS 37 and involves the payment of termination benefits. If the termination benefits are not expected to be settled wholly before twelve months after the end of the annual reporting period, the Group measures the termination benefit with present value of future cash payments.
Revenue from contracts with customers	(o) Revenue from contracts with customers Revenue from the sale of goods in the course of ordinary activities is measured at the fair value of the consideration received or receivable, net of estimated returns, earned trade discounts, volume rebates and other cash incentives paid to customers. The Group has initially applied IFRS 15 from January 1, 2018 and recognized revenue according to the 5 stage revenue recognition model (①Identifying the contract →② Identifying performance obligation →③ Determining transaction price →④ Allocating the transaction price to performance obligation →⑤ Recognition of revenue at performance of obligation). The Group generates revenue primarily from sales of display panels to customer. Product revenue is recognized when the customer obtains control over the products, which typically occurs upon shipment or delivery depending on the terms of the contracts with the customers. The Group includes return option in the sales contract of display panels to its customers thus the consideration received from the customer is subject to change. The Group has recognized the expected return amount of gross revenue as warranty provision until previous financial year. After applying the IFRS 15 “Revenue from contracts with customers”, the Group estimates an amount of variable consideration by using the expected value method which the Group expects to better predict the amount of consideration. The Group includes in the transaction price some or all of an amount of variable consideration estimated only to the extent that it is highly probable that a significant reversal in the amount of cumulative revenue recognized will not occur when the uncertainty associated with the variable consideration is subsequently resolved. The Group recognizes a refund liability and an asset for its right to recover products from customers if the Group receives consideration from a customer and expects to refund some or all of that consideration to the customer. Sales taxes collected from customers and remitted to governmental authorities are accounted for on a net basis and therefore are excluded from revenues in the consolidated statements of comprehensive income.
Operating Segments	(p) Operating Segments An operating segment is a component of the Group that: 1) engages in business activities from which it may earn revenues and incur expenses, including revenues and expenses that relate to transactions with other components of the group, 2) whose operating results are reviewed regularly by the Group’s chief operating decision maker (“CODM”) in order to allocate resources and assess its performance, and 3) for which discrete financial information is available. Management has determined that the CODM of the Group is the Board of Directors. The CODM does not receive and therefore does not review discrete financial information for any component of the Group. Consequently, no operating segment information is included in these consolidated financial statements. Entity wide disclosures of geographic and product revenue information are provided in note 17 to these consolidated financial statements.
Finance Income and Finance Costs	(q) Finance Income and Finance Costs Finance income comprises interest income on funds invested (including debt instruments measured at FVOCI), dividend income, gains on the disposal of debt instruments measured at FVOCI, changes in the fair value of financial assets at FVTPL, and gains on hedging instruments that are recognized in profit or loss. Interest income is recognized as it accrues in profit or loss, using the effective interest method. Dividend income is recognized in profit or loss on the date that the Group’s right to receive payment is established. Finance costs comprise interest expense on borrowings, unwinding of the discount on provisions, gain and losses from financial assets measured at FVTPL, impairment losses recognized on financial assets, and losses on hedging instruments that are recognized in profit or loss. Borrowing costs directly attributable to the acquisition, construction or production of a qualifying asset are capitalized as part of the cost of that asset.
Income Tax	(r) Income Tax Income tax expense comprises current and deferred tax. Current tax and deferred tax are recognized in profit or loss except to the extent that it relates to a business combination, or items recognized directly in equity or in other comprehensive income. (i) Current tax Current tax is the expected tax payable or receivable on the taxable profit or loss for the year, using tax rates enacted or substantively enacted at the reporting date and any adjustment to tax payable in respect of previous years. The taxable profit is different from the accounting profit for the period since the taxable profit is calculated excluding the temporary differences, which will be taxable or deductible in determining taxable profit (tax loss) of future periods, and non-taxable non-deductible (ii) Deferred tax Deferred tax is recognized, using the liability method, in respect of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for taxation purposes. Deferred tax assets and liabilities are measured at the tax rates that are expected to apply to the period when the asset is realized or the liability is settled, based on tax rates and tax laws that have been enacted or substantively enacted by the end of the reporting period. The measurement of deferred tax liabilities and deferred tax assets reflects the tax consequences that would follow from the manner in which the Group expects, at the end of the reporting period, to recover or settle the carrying amount of its assets and liabilities. However, deferred tax is not recognized for taxable temporary differences arising on the initial recognition of goodwill. The Group recognizes a deferred tax liability for all taxable temporary differences associated with investments in subsidiaries, associates, and interests in joint ventures, except to the extent that the Group is able to control the timing of the reversal of the temporary differences and it is probable that the temporary differences will not reverse in the foreseeable future. A deferred tax asset is recognized for all deductible temporary differences to the extent that it is probable that the differences relating to investments in subsidiaries, associates and joint ventures will reverse in the foreseeable future and taxable profit will be available against which the temporary difference can be utilized. Deferred tax assets are reviewed at each reporting date and are reduced to the extent that it is no longer probable that the related tax benefit will be realized. The Group offsets deferred tax assets and deferred tax liabilities if, and only if the Group has a legally enforceable right to set off current tax assets against current tax liabilities and the deferred tax assets and the deferred tax liabilities relate to income taxes levied by the same taxation authority on either the same taxable entity or different taxable entities which intend either to settle current tax liabilities and assets on a net basis, or to realize the assets and settle the liabilities simultaneously.
Earnings Per Share	(s) Earnings Per Share The Controlling Company presents basic and diluted earnings per share (“EPS”) data for its common stocks. Basic EPS is calculated by dividing the profit or loss attributable to ordinary shareholders of the Controlling Company by the weighted average number of common stocks outstanding during the period. Diluted EPS is determined by adjusting the profit or loss attributable to ordinary shareholders and the weighted average number of common stocks outstanding, adjusted for the effects of all dilutive potential common stocks such as convertible bonds and others.
New Standards and Amendments Not Yet Adopted	(t) New Standards and Amendments Not Yet Adopted The following new standards and amendments to existing standards have been published and are mandatory for the Group for annual periods beginning after January 1, 2018, and the Group has not early adopted them. (i) IFRS 16, Leases IFRS 16, Leases Leases Determining whether an Arrangement contains a Lease SIC-15, Operating Leases—Incentives SIC-27, valuating the Substance of Transactions Involving the Legal Form of a Lease IFRS 16, Leases on-balance right-of-use Previously, the Group recognized operating lease expense on a straight-line basis over the term of the lease. The nature of expenses related to those leases will now change because the Group will recognize a depreciation charge for right-of-use No significant impact is expected for the Group’s finance lease. A lessee may apply the IFRS 16 to its leases either: • Retrospectively to each prior reporting period presented • Retrospectively with the cumulative effect of initially applying the Standard recognized at the date of initial application A lessee shall apply the election consistently to all of its lease in which it is a lessee. The Group will apply IFRS 16 initially on January 1, 2019, using the modified retrospective approach. Therefore, the cumulative effect of adopting IFRS 16 will be recognized as an adjustment to the opening balance of retained earnings at January 1, 2019, with no restatement of comparative information. A lessee may use various practical expedients when applying IRFS 16 retrospectively to leases previously classified as operating leases applying IAS 17. Based on the Group’s assessment on the impact of the adoption, the right-of-use (ii) Other standards The following amended standards and interpretations are not expected to have a significant impact on the Group’s financial statements. • IFRIC 23, Uncertainty over Tax Treatments • IFRS 9, Prepayment Features with Negative Compensation • IAS 28 , Long-term Interests in Associates and Joint Ventures • IAS 19, Plan Amendment, Curtailment or Settlement • Amendments to References to Conceptual Framework in IFRS Standards

Reporting Entity (Tables)

Reporting Entity (Tables)	12 Months Ended
	Dec. 31, 2018
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Summary of Consolidated Subsidiaries	(b) Consolidated Subsidiaries as of December 31, 2018 (In millions) Subsidiaries Location Percentage Fiscal year end Date of Business Capital stocks LG Display America, Inc. San Jose, U.S.A. 100% December 31 September 24, 1999 Sell Display products USD 411 LG Display Germany GmbH Eschborn, Germany 100% December 31 November 5, 1999 Sell Display products EUR 1 LG Display Japan Co., Ltd. Tokyo, Japan 100% December 31 October 12, 1999 Sell Display products JPY 95 LG Display Taiwan Co., Ltd. Taipei, Taiwan 100% December 31 April 12, 1999 Sell Display products NTD 116 LG Display Nanjing Co., Ltd. Nanjing, China 100% December 31 July 15, 2002 Manufacture Display products CNY 3,020 LG Display Shanghai Co., Ltd. Shanghai, China 100% December 31 January 16, 2003 Sell Display products CNY 4 LG Display Poland Sp. z o.o. Wroclaw, Poland 100% December 31 September 6, 2005 Manufacture Display products PLN 511 LG Display Guangzhou Co., Ltd. Guangzhou, China 100% December 31 June 30, 2006 Manufacture Display products CNY 1,655 LG Display Shenzhen Co., Ltd. Shenzhen, China 100% December 31 August 28, 2007 Sell Display products CNY 4 LG Display Singapore Pte. Ltd. Singapore 100% December 31 January 12, 2009 Sell Display products USD 1.1 L&T Display Technology (Fujian) Limited Fujian, China 51% December 31 January 5, 2010 Manufacture and sell LCD module and LCD monitor sets CNY 116 LG Display Yantai Co., Ltd. Yantai, China 100% December 31 April 19, 2010 Manufacture Display products CNY 1,008 Nanumnuri Co., Ltd. Gumi, South Korea 100% December 31 March 21, 2012 Janitorial services KRW 800 LG Display (China) Co., Ltd. Guangzhou, China 70% December 31 December 10, 2012 Manufacture and sell Display products CNY 8,232 Unified Innovative Technology, LLC Wilmington, U.S.A. 100% December 31 March 12, 2014 Manage intellectual property USD 9 LG Display Guangzhou Trading Co., Ltd. Guangzhou, China 100% December 31 April 28, 2015 Sell Display products CNY 1.2 Global OLED Technology, LLC Herndon, U.S.A. 100% December 31 December 18, 2009 Manage OLED intellectual property USD 138 LG Display Vietnam Haiphong Co., Ltd.(*1) Haiphong Vietnam 100% December 31 May 5, 2016 Manufacture Display products USD 300 Suzhou Lehui Display Co., Ltd. Suzhou, China 100% December 31 July 1, 2016 Manufacture and sell LCD module and LCD monitor sets CNY 637 LG DISPLAY FUND I LLC(*2) Wilmington, U.S.A. 100% December 31 May 1, 2018 Invest in venture business and obtain technologies USD 2 LG Display High-Tech (China) Co., Ltd.(*3) Guangzhou, China 69% December 31 July 11, 2018 Manufacture Display products CNY 6,517 Money Market Trust(*4) Seoul, South Korea 100% December 31 — Money market trust KRW 24,501 (*1) For the year ended December 31, 2018, the Controlling Company contributed W (*2) For the year ended December 31, 2018, the Controlling Company established LG DISPLAY FUND I LLC in Wilmington, U.S.A. to invest in venture business and the Controlling Company has a 100% equity interest of this subsidiary. (*3) For the year ended December 31, 2018, the Controlling Company established LG Display High-Tech (China) Co., Ltd. in Guangzhou China to manufacture Display products and the Group has a 69% equity interest of this subsidiary. (*4) For the year ended December 31, 2018, the Controlling Company acquired and disposed interests in Money Market Trust (“MMT”) and the MMT amount as of December 31, 2018 is W

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
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Schedule of Changes in Each Class of Financial Assets from Original Measurement Categories under IAS39 to Measurement Categories under IFRS 9	The adoption IFRS 9 has not had a significant effect on the Group’s accounting policies related to financial liabilities and derivative financial instruments. The following table below explains the original measurement categories under IAS 39 and the changes in measurement categories under IFRS 9 for each class of the Group’s financial assets as at January 1, 2018. ( In millions of won ) Classification under IAS 39 Classification IFRS 9 Carrying amount IAS 39 Carrying amount IFRS 9 Difference Financial assets Cash and cash equivalents Loans and receivables Amortized cost W 2,602,560 2,602,560 — Deposits Loans and receivables Amortized cost 758,089 758,089 — Trade receivables Loans and receivables Amortized cost 4,325,120 4,325,120 — Other receivables Loans and receivables Amortized cost 173,565 173,565 — Debt instrument Available-for-sale FVOCI-debt 162 162 — Equity instrument Available-for-sale Mandatorily at FVTPL 4,980 4,980 — Convertible bonds Designated as at Mandatorily at 1,552 1,552 — Derivatives Designated as at Mandatorily at 842 842 — Others Loans and receivables Amortized cost 79,552 79,552 — Total financial assets W 7,946,422 7,946,422 —
Schedule of Effect on Application of IFRS 15 on Group's Consolidated Statement of Financial Position	The effect of the application of IFRS 15 on the Group’s consolidated statement of financial position as of December 31, 2018 is as follows. There is no significant impact on the consolidated statement of comprehensive income and the cash flows for the year ended December 31, 2018. (In millions of won) Categories As reported Adjustments Amounts without Current Assets Other current assets W 546,048 (7,489 ) 538,559 Current Liabilities Provisions W 98,254 (7,489 ) 90,765
Estimated Useful Lives of Property, Plant and Equipment	Estimated useful lives of the assets are as follows: Useful lives (years) Buildings and structures 20, 40 Machinery 4, 5 Furniture and fixtures 4 Equipment, tools and vehicles 2, 4, 12
Schedule of Impact on Depreciation Expense of Property Plant and Equipment and Newly Acquired Property Plant and Equipment	The impact on the depreciation expense of the property, plant and equipment at the beginning of January 1, 2018 and newly acquired property, plant and equipment during the year ended December 31, 2018 are as follows: (In millions of won) Description 2018 2019 2020 Increase (decrease) in depreciation expense W (110,373 ) 58,364 52,009
Estimated Useful Lives of Intangible Assets, Other Than Goodwill	Estimated useful lives (years) Intellectual property rights 5, 10 Rights to use electricity, water and gas supply facilities 10 Software 4 Customer relationships 7, 10 Technology 10 Development costs (*) Condominium and golf club memberships Not amortized (*) Capitalized development costs are amortized over the useful life considering the life cycle of the developed products. Amortization of capitalized development costs is recognized in research and development expenses in the consolidated statement of comprehensive income.

Cash and Cash Equivalents and_2

Cash and Cash Equivalents and Deposits in Banks (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Cash and Cash Equivalents and Deposits in Banks	Cash and cash equivalents and deposits in banks as of December 31, 2017 and December 31, 2018 are as follows: (In millions of won) December 31, 2017 December 31, 2018 Current assets Cash and cash equivalents Demand deposits W 2,602,560 2,365,022 Deposits in banks Time deposits W 685,238 4,318 Restricted cash(*) 72,840 74,082 W 758,078 78,400 Non-current Deposits in banks Restricted cash(*) W 11 11 W 3,360,649 2,443,433 (*) Restricted cash includes mutual growth fund to aid LG Group’s second and third-tier suppliers, pledge to enforce investment plans according to the receipt of subsidies from Gumi city and Gyeongsangbuk- do and others.

Receivables and Other Assets (T

Receivables and Other Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Trade Accounts and Notes Receivable	(a) Trade accounts and notes receivable as of December 31, 2017 and December 31, 2018 are as follows: ( In millions of won December 31, 2017 December 31, 2018 Trade, net W 3,275,902 2,305,368 Due from related parties 1,049,218 523,795 W 4,325,120 2,829,163
Summary of Other Accounts Receivable	(b) Other accounts receivable as of December 31, 2017 and December 31, 2018 are as follows: (In millions of won) December 31, 2017 December 31, 2018 Current assets Non-trade W 150,554 159,238 Accrued income 14,273 10,075 W 164,827 169,313 Non-current assets Long-term non-trade 8,738 11,448 W 173,565 180,761
Aging of Trade Accounts and Notes Receivable, Other Accounts Receivable and Long-term Non-trade Receivable	(c) The aging of trade accounts and notes receivable, and other accounts receivable as of December 31, 2017 and December 31, 2018 are as follows: (In millions of won) December 31, 2017 Book value Impairment loss Trade accounts and notes receivable Other accounts receivable Trade accounts and notes receivable Other accounts receivable Not past due W 4,323,465 173,493 (1,631 ) (905 ) Past due 1-15 2,652 488 (1 ) (3 ) Past due 16-30 days 631 65 — (1 ) Past due 31-60 — 208 — (2 ) Past due more than 60 days 4 622 — (400 ) W 4,326,752 174,876 (1,632 ) (1,311 ) (In millions of won) December 31, 2018 Book value Impairment loss Trade accounts and notes receivable Other accounts receivable Trade accounts and notes receivable Other accounts receivable Not past due W 2,807,598 177,689 (473 ) (816 ) Past due 1-15 21,558 3,148 (4 ) (26 ) Past due 16-30 days 454 441 — (4 ) Past due 31-60 30 96 — (1 ) Past due more than 60 days — 668 — (434 ) W 2,829,640 182,042 (477 ) (1,281 )
Movement in Allowance for Impairment in Respect of Trade Accounts and Notes Receivable, Other Accounts Receivable	The movement in the allowance for impairment in respect of trade accounts and notes receivable and other accounts receivable for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) Trade accounts and notes receivable 2016 2017 2018 Balance at the beginning of the year W 1,507 1,488 1,632 (Reversal of) bad debt expense (19 ) 144 (1,155 ) Balance at the end of the year W 1,488 1,632 477 (In millions of won) Other accounts receivable 2016 2017 2018 Balance at the beginning of the year W 618 1,116 1,311 (Reversal of) bad debt expense 498 195 (30 ) Balance at the end of the year W 1,116 1,311 1,281
Summary of Other Assets	(d) Other assets as of December 31, 2017 and December 31, 2018 are as follows: (In millions of won) December 31, 2017 December 31, 2018 Current assets Advance payments W 7,973 13,259 Prepaid expenses 83,626 89,110 Value added tax refundable 148,351 436,190 Emission rights 1,978 — Right to recover returned goods(*) — 7,489 W 241,928 546,048 Non-current Long-term prepaid expenses W 394,759 381,983 (*) As a result from the initial application of IFRS 15, the Group recognized an asset for right to recover goods returned by the customer.

Other Financial Assets (Tables)

Other Financial Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Other Financial Assets	(a) Other financial assets as of December 31, 2017 are as follows: (In millions of won) December 31, 2017 Current assets Available-for-sale Debt instrument Government bonds W 6 Deposits 10,480 Short-term loans 16,766 W 27,252 Non-current Financial asset at fair value through profit or loss W 1,552 Available-for-sale Government bonds W 156 Equity instrument Intellectual Discovery, Ltd. W 729 Kyulux, Inc. 1,968 ARCH Venture Fund Vill, LP. 2,283 W 4,980 Deposits W 19,898 Long-term loans 32,408 Derivatives(*) 842 W 59,836 (*) Represents interest rate swap contracts related to borrowings with variable interest rate. (b) Other financial assets as of December 31, 2018 are as follows: (In millions of won) December 31, 2018 Current assets Financial asset at fair value through profit or loss Derivatives(*) W 13,059 Financial asset at fair value through other comprehensive income Debt instrument Government bonds W 106 Financial asset carried at amortized cost Deposits W 17,020 Short-term loans 16,116 W 46,301 Non-current Financial asset at fair value through profit or loss Equity instrument Intellectual Discovery, Ltd. W 4,598 Kyulux, Inc. 2,460 Fineeva Co., Ltd. 286 ARCH Venture Fund Vill, L.P. 6,337 W 13,681 Convertible bonds W 1,327 Financial asset at fair value through other comprehensive income Debt instrument Government bonds W 55 Financial asset carried at amortized cost Deposits W 74,103 Long-term loans 55,048 W 144,214 (*) Represents exchange rate swap contracts related to foreign currency denominated borrowings and bonds.

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Inventories	Inventories at the reporting date are as follows: (In millions of won) December 31, 2017 December 31, 2018 Finished goods W 965,643 1,084,297 Work-in-process 748,592 856,388 Raw materials 344,997 554,720 Supplies 290,852 195,798 W 2,350,084 2,691,203
Inventories Recognized as Cost of Sales and Inventory Write-downs Included in Cost of Sales	(In millions of won) 2016 2017 2018 Inventories recognized as cost of sales W 22,754,270 22,424,661 21,251,305 Including: inventory write-downs 204,123 206,127 313,180

Investments in Equity Account_2

Investments in Equity Accounted Investees (Tables)	12 Months Ended
	Dec. 31, 2018
Statement [LineItems]
Summary of Consolidated Associates	(a) Associates at the reporting date are as follows: (In millions of won) Associates Location Fiscal year end Date of Business 2017 2018 Percentage Carrying amount Percentage Carrying amount Paju Electric Glass Co., Ltd. Paju, South Korea December 31 January 2005 Manufacture electric glass for FPDs 40% W 40% W INVENIA Co., Ltd. Seongnam, South Korea December 31 January 2001 Develop and manufacture equipment for FPDs 13 2,887 13 4,166 WooRee E&L Co., Ltd.(*1) Ansan, South Korea December 31 June 2008 Manufacture LED back light unit packages 14 7,270 14 4,746 LB Gemini New Growth Fund No. 16(*2) Seoul, South Korea December 31 December 2009 Invest in small and middle sized companies and benefit from M&A opportunities 31 5,910 — — YAS Co., Ltd. Paju, South Korea December 31 April 2002 Develop and manufacture deposition equipment for OLEDs 15 15,888 15 16,308 AVATEC Co., Ltd. Daegu, South Korea December 31 August 2000 Process and sell electric glass for FPDs 17 23,732 17 23,441 Arctic Sentinel, Inc. Los Angeles, U.S.A. March 31 June 2008 Develop and manufacture tablet for kids 10 — 10 — (In millions of won) Associates Location Fiscal year end Date of Business 2017 2018 Percentage of ownership Carrying amount Percentage of Carrying amount CYNORA GmbH(*3) Bruchsal, Germany December 31 March 2003 Develop organic emitting materials for displays and lighting devices 14% W 14% W Material Science Co., Ltd.(*4) Seoul, South Korea December 31 January 2014 Develop, manufacture, and sell materials for display — — 10 3,346 Nanosys Inc.(*5) Milpitas, U.S.A. December 31 July 2001 Develop, manufacture, and sell materials for display — — 4 5,491 W W Although the Controlling Company’s share interests in INVENIA Co., Ltd., WooRee E&L Co., Ltd., YAS Co., Ltd., AVATEC Co., Ltd., Arctic Sentinel, Inc., Cynora GmbH, Material Science Co., Ltd. and Nanosys Inc. are below 20% as of December 31, 2018, the Controlling Company is able to exercise significant influence through its right to appoint a director to the board of directors of each investee. Accordingly, the investments in these investees have been accounted for using the equity method. (*1) The Controlling Company recognized a reversal of impairment loss of W (*2) In 2018, the LB Gemini New Growth Fund No.16 (“the Fund”) which the Controlling Company was a member of a limited partnership, was approved to be dissolve at the general meeting and completed liquidation. In 2018, the Controlling Company received W W (*3) In 2018, the Controlling Company determined investments in CYNORA GmbH irrecoverable and accordingly recognized an impairment loss of W (*4) In March 2018, the Controlling Company invested W W (*5) In May 2018, the Controlling Company invested W W .
Changes in Investments in Associates and a Joint Venture Accounted for Using Equity Method	(e) Changes in investments in associates accounted for using the equity method for the years ended December 31, 2017 and 2018 are as follows: (In millions of won) 2017 Company January 1 Acquisition/ Disposal Dividends Equity income Other Other December 31 Associates Paju Electric Glass Co., Ltd. W 52,750 — (8,109 ) 5,617 (3,747 ) — 46,511 Others 119,933 (48,209 ) (530 ) 3,943 5,093 (4,234 ) 75,996 W 172,683 (48,209 ) (8,639 ) 9,560 1,346 (4,234 ) 122,507 (In millions of won) 2018 Company January 1 Acquisition/ Disposal Dividends Equity income Other Other December 31 Associates Paju Electric Glass Co., Ltd. W 46,511 — (4,172 ) 4,439 1,045 — 47,823 Others 75,996 12,592 (1,100 ) (3,739 ) (988 ) (16,595 ) 66,166 W 122,507 12,592 (5,272 ) 700 57 (16,595 ) 113,989
Paju Electric Glass Co., Ltd. [member]
Statement [LineItems]
Summary of Financial Information of Significant Associates	(b) Summary of financial information of the significant associate as of December 31, 2017 and 2018 and for the years ended December 31, 2016, 2017 and 2018 are as follows: (i) Paju Electric Glass Co., Ltd. ( In millions of won ) December 31, 2017 December 31, 2018 Total assets W 193,584 194,021 Current assets 146,702 128,788 Non-current 46,882 65,233 Total liabilities 77,174 72,686 Current liabilities 71,973 66,797 Non-current 5,201 5,889 (In millions of won) 2016 2017 2018 Revenue W 549,559 408,846 384,144 Profit for the year 21,082 12,327 12,744 Other comprehensive income (loss) 16,477 (9,366 ) 2,612 Total comprehensive income 37,559 2,961 15,356
Suzhou Raken Technology Co., Ltd. [member]
Statement [LineItems]
Reconciliation from Financial Information of Significant Associate to its Carrying Value in Consolidated Financial Statements	(c) Reconciliation from financial information of the significant associate to its carrying value in the consolidated financial statements as of December 31, 2017 and 2018 is as follows: (i) As of December 31, 2017 (In millions of won) Company Net asset Ownership Net asset Goodwill Intra-group Book Paju Electric Glass Co., Ltd. W 116,410 40 % 46,564 — (53 ) 46,511 (ii) As of December 31, 2018 (In millions of won) Company Net asset Ownership Net asset Goodwill Intra-group Book Paju Electric Glass Co., Ltd. W 121,335 40 % 48,534 — (711 ) 47,823
Other joint venture and associates, in aggregate [member]
Statement [LineItems]
Summary of Financial Information of Significant Associates	(d) Book value of other associates, in aggregate, as of December 31, 2017 and 2018 is as follows: (i) As of December 31, 2017 (In millions of won) Book value Net profit of associates (applying ownership Profit for Other Total Other associates W 75,996 3,943 5,093 9,036 (ii) As of December 31, 2018 (In millions of won) Book value Net profit (loss) of associates (applying ownership Profit (loss) Other Total Other associates W 66,166 (3,739 ) (988 ) (4,727 )

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Changes in Property, Plant and Equipment	(a) Changes in property, plant and equipment for the year ended December 31, 2017 are as follows: (In millions of won) Land Buildings Machinery and equipment Furniture and fixtures Construction- in-progress (*1) Others Total Acquisition cost as of January 1, 2017 W 461,484 6,284,778 37,472,177 775,682 2,981,964 202,306 48,178,391 Accumulated depreciation as of January 1, 2017 — (2,397,967 ) (32,947,359 ) (651,424 ) — (146,251 ) (36,143,001 ) Accumulated impairment loss as of January 1, 2017 — (1,651 ) (2,290 ) — — — (3,941 ) Book value as of January 1, 2017 W 461,484 3,885,160 4,522,528 124,258 2,981,964 56,055 12,031,449 Additions — — — — 7,272,476 — 7,272,476 Depreciation — (295,045 ) (2,416,202 ) (66,963 ) — (13,673 ) (2,791,883 ) Disposals (1,042 ) (7,206 ) (75,275 ) (52 ) — (3,133 ) (86,708 ) Others(*2) 69 339,640 3,825,155 87,186 (4,270,210 ) 18,160 — Effect of movements in exchange rates — (63,222 ) (140,306 ) (3,087 ) (14,213 ) (687 ) (221,515 ) Government grants received — (548 ) (3,150 ) — 1,839 — (1,859 ) Book value as of December 31, 2017 W 460,511 3,858,779 5,712,750 141,342 5,971,856 56,722 16,201,960 Acquisition cost as of December 31, 2017 W 460,511 6,539,506 38,901,158 772,824 5,971,856 205,475 52,851,330 Accumulated depreciation as of December 31, 2017 W — (2,678,970 ) (33,186,118 ) (631,482 ) — (148,753 ) (36,645,323 ) Accumulated impairment loss as of December 31, 2017 W — (1,757 ) (2,290 ) — — — (4,047 ) (*1) As of December 31, 2017, construction-in-progress mainly relates to construction of manufacturing facilities. (*2) Others are mainly amounts transferred from construction-in-progress. (b) Changes in property, plant and equipment for the year ended December 31, 2018 are as follows: (In millions of won) Land Buildings Machinery and equipment Furniture and fixtures Construction- in-progress (*1) Others Total Acquisition cost as of January 1, 2018 W 460,511 6,539,506 38,901,158 772,824 5,971,856 205,475 52,851,330 Accumulated depreciation as of January 1, 2018 — (2,678,970 ) (33,186,118 ) (631,482 ) — (148,753 ) (36,645,323 ) Accumulated impairment loss as of January 1, 2018 — (1,757 ) (2,290 ) — — — (4,047 ) Book value as of January 1, 2018 W 460,511 3,858,779 5,712,750 141,342 5,971,856 56,722 16,201,960 Additions — — — — 8,605,551 — 8,605,551 Depreciation — (318,311 ) (2,568,335 ) (67,274 ) — (169,739 ) (3,123,659 ) Disposals (15 ) (161 ) (112,752 ) (311 ) — (2,971 ) (116,210 ) Impairment loss — — (25,711 ) — (17,890 ) — (43,601 ) Others(*2) 1,332 55,430 1,959,645 68,177 (2,357,412 ) 380,278 107,450 Effect of movements in exchange rates — 9,809 14,520 359 15,010 312 40,010 Government grants received — — (1,029 ) — (181 ) — (1,210 ) Reclassification to assets held-for-sale — (69,758 ) (1 ) (37 ) — (365 ) (70,161 ) Book value as of December 31, 2018 W 461,828 3,535,788 4,979,087 142,256 12,216,934 264,237 21,600,130 Acquisition cost as of December 31, 2018 W 461,828 6,528,939 39,825,070 834,628 12,234,824 633,220 60,518,509 Accumulated depreciation as of December 31, 2018 W — (2,991,445 ) (34,817,982 ) (692,372 ) — (368,893 ) (38,870,782 ) Accumulated impairment loss as of December 31, 2018 W — (1,706 ) (28,001 ) — (17,890 ) — (47,597 ) (*1) As of December 31, 2018, construction-in-progress mainly relates to construction of manufacturing facilities. (*2) Others are mainly amounts transferred from construction-in-progress.
Capitalized Borrowing Costs and Capitalization Rate	(c) Capitalized borrowing costs and capitalization rate for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Capitalized borrowing costs W 16,909 47,686 146,607 Capitalization rate 2.91 % 1.92 % 2.80 %

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Changes in Intangible Assets	(a) Changes in intangible assets for the year ended December 31, 2017 are as follows: (In millions of won) Intellectual property Software Member- Development Construction- in-progress Customer relationships Technology Good-will(*2) Others (*3) Total Acquisition cost as of January 1, 2017 W 904,664 806,835 51,564 1,433,791 18,738 59,176 11,074 110,072 13,077 3,408,991 Accumulated amortization as of January 1, 2017 (618,398 ) (661,063 ) — (1,177,451 ) — (26,678 ) (7,382 ) — (13,071 ) (2,504,043 ) Accumulated impairment loss as of January 1, 2017 — — (10,011 ) — — — — — — (10,011 ) Book value as of January 1, 2017 W 286,266 145,772 41,553 256,340 18,738 32,498 3,692 110,072 6 894,937 Additions - internally developed — — — 336,207 — — — — — 336,207 Additions - external purchases 22,746 — 4,819 — 108,761 — — — — 136,326 Amortization(*1) (42,195 ) (78,939 ) — (295,787 ) — (4,659 ) (1,108 ) — (5 ) (422,693 ) Disposals (4 ) — (1,392 ) — — — — — — (1,396 ) Impairment loss — — (1,809 ) — — — — — — (1,809 ) Reversal of impairment loss — — 35 — — — — — — 35 Transfer from construction-in-progress — 98,989 — — (98,989 ) — — (3,218 ) — (3,218 ) Effect of movements in exchange rates (19,847 ) (4,332 ) (6 ) — 2,423 — — (3,806 ) — (25,568 ) Book value as of December 31, 2017 W 246,966 161,490 43,200 296,760 30,933 27,839 2,584 103,048 1 912,821 Acquisition cost as of December 31, 2017 W 895,721 898,278 54,985 1,769,998 30,933 59,176 11,074 103,048 13,077 3,836,290 Accumulated amortization as of December 31, 2017 W (648,755 ) (736,788 ) — (1,473,238 ) — (31,337 ) (8,490 ) — (13,076 ) (2,911,684 ) Accumulated impairment loss as of December 31, 2017 W — — (11,785 ) — — — — — — (11,785 ) (*1) The Group has classified the amortization as manufacturing overhead costs, selling expenses, administrative expenses and research and development expenses. (*2) As of December 31, 2017, the book value of goodwill decreased by W (*3) Others mainly consist of rights to use electricity and gas supply facilities. (b) Changes in intangible assets for the year ended December 31, 2018 are as follows: (In millions of won) Intellectual property Software Member- Development Construction- in-progress Customer relationships Technology Good- will Others (*2) Total Acquisition cost as of January 1, 2018 W 895,721 898,278 54,985 1,769,998 30,933 59,176 11,074 103,048 13,077 3,836,290 Accumulated amortization as of January 1, 2018 (648,755 ) (736,788 ) — (1,473,238 ) — (31,337 ) (8,490 ) — (13,076 ) (2,911,684 ) Accumulated impairment loss as of January 1, 2018 — — (11,785 ) — — — — — — (11,785 ) Book value as of January 1, 2018 W 246,966 161,490 43,200 296,760 30,933 27,839 2,584 103,048 1 912,821 Additions - internally developed — — — 372,835 — — — — — 372,835 Additions - external purchases 24,596 — 2,844 — 100,820 — — — — 128,260 Amortization(*1) (43,437 ) (80,159 ) — (302,685 ) — (3,517 ) (1,107 ) — (1 ) (430,906 ) Disposals — — (721 ) — — — — — — (721 ) Impairment loss — — (82 ) — — — — — — (82 ) Reversal of impairment loss — — 348 — — — — — — 348 Transfer from construction-in-progress — 95,028 449 — (95,028 ) — — — — 449 Effect of movements in exchange rates 1,896 1,240 1 — 238 — — 1,263 — 4,638 Book value as of December 31, 2018 W 230,021 177,599 46,039 366,910 36,963 24,322 1,477 104,311 — 987,642 Acquisition cost as of December 31, 2018 W 926,969 992,139 57,560 2,142,832 36,963 59,176 11,075 104,311 13,077 4,344,102 Accumulated amortization as of December 31, 2018 W (696,948 ) (814,540 ) — (1,775,922 ) — (34,854 ) (9,598 ) — (13,077 ) (3,344,939 ) Accumulated impairment loss as of December 31, 2018 W — — (11,521 ) — — — — — — (11,521 ) (*1) The Group has classified the amortization as manufacturing overhead costs, selling expenses, administrative expenses and research and development expenses. (*2) Others mainly consist of rights to use electricity and gas supply facilities.
Summary of Development Costs	(d) Development costs as of December 31, 2017 and 2018 are as follows: (i) As of December 31, 2017 (In millions of won and in years) Classification Product Book Value Remaining Useful life Development completed Mobile W 79,372 0.6 TV 36,038 0.6 Notebook 14,311 0.5 Others 12,444 0.4 Sub-Total W 142,165 Development in process Mobile W 117,222 — TV 30,670 — Notebook 2,356 — Others 4,347 — Sub-Total W 154,595 Total W 296,760 (ii) As of December 31, 2018 (In millions of won and in years) Classification Product Book Value Remaining Useful life Development completed Mobile W 108,467 0.5 TV 28,001 0.5 Notebook 4,458 0.6 Others 9,475 0.5 Sub-Total W 150,401 Development in process Mobile W 144,679 — TV 55,580 — Notebook 9,639 — Others 6,611 — Sub-Total W 216,509 Total W 366,910

Financial Liabilities (Tables)

Financial Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Statement [LineItems]
Summary of Financial Liabilities	(a) Financial liabilities at the reporting date are as follows: (In millions of won) December 31, 2017 December 31, 2018 Current Current portion of long-term borrowings and bonds W 1,452,926 1,553,907 W 1,452,926 1,553,907 Non-current Won denominated borrowings W 1,251,258 2,700,608 Foreign currency denominated borrowings 1,392,931 2,531,663 Bonds 1,506,003 1,772,599 Derivatives(*) — 25,758 W 4,150,192 7,030,628 (*) Represents exchange rate swap contracts related to foreign currency denominated borrowings and bonds .
Bonds issued and outstanding [member]
Statement [LineItems]
Summary of Debt Instrument	(d) Details of bonds issued and outstanding at the reporting date are as follows: (In millions of won) Maturity Annual interest rate as December 31, December 31, Won denominated bonds(*1) Publicly issued bonds April 2019 ~ February 2023 1.80~3.45 W 2,015,000 1,900,000 Privately issued bonds May 2025 ~ May 2033 3.25~4.25 — 110,000 Less discount on bonds (4,238 ) (3,949 ) Less current portion (504,759 ) (559,658 ) W 1,506,003 1,446,393 Foreign currency denominated Publicly issued bond November 2021 3.88 W — 335,430 Foreign currency equivalent — USD 300 Less discount on bonds — (9,224 ) W — 326,206 W 1,506,003 1,772,599 (*1) Principal of the won denominated bonds is to be repaid at maturity and interests are paid quarterly. (*2) Principal of the foreign currency denominated bond is to be repaid at maturity and interests are paid semi-annually.
Long-term borrowings [Member]
Statement [LineItems]
Summary of Debt Instrument	(b) Won denominated long-term borrowings at the reporting date are as follows: (In millions of won) Lender Annual interest rate as of December 31, 2018 (%) December 31, December 31, Woori Bank 3-year Bond rate – 2.75 W 1,922 1,259 Shinhan Bank — 200,000 — Korea Development Bank and others CD rate (91days) + 0.64, 2.43~3.25 1,250,000 2,850,000 Less current portion of long-term borrowings (200,664 ) (150,651 ) W 1,251,258 2,700,608 (c) Foreign currency denominated long-term borrowings at the reporting date are as follows: ( In millions of won and USD, CNY) Lender Annual interest rate as of December 31, 2018 (%)(*) December 31, December 31, The Export-Import Bank of Korea 3ML+0.75~1.70 W 755,337 955,975 China Construction Bank and others USD: 3ML+0.80~2.00 CNY: PBOC*(0.90~1.05) 1,385,097 2,419,286 Foreign currency equivalent USD 1,500 USD 2,262 CNY 3,263 CNY 5,198 Less current portion of long-term borrowings W (747,503 ) (843,598 ) W 1,392,931 2,531,663 (*) ML represents Month LIBOR (London Inter-Bank Offered Rates) and PBOC represents People’s Bank of China.

Employee Benefits (Tables)

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2018
Statement [LineItems]
Net Defined Benefit Liabilities, Changes in Present Value of Defined Benefit Obligations and Changes in Fair Value of Plan Assets	(a) Net defined benefit liabilities recognized at the reporting date are as follows: (In millions of won) December 31, 2017 December 31, 2018 Present value of partially funded defined benefit obligations W 1,562,424 1,595,423 Fair value of plan assets (1,466,977 ) (1,550,063 ) W 95,447 45,360
Details of Plan Assets	(d) Plan assets at the reporting date are as follows: (In millions of won) December 31, 2017 December 31, 2018 Guaranteed deposits in banks W 1,466,977 1,550,063
Expenses Recognized in Profit or Loss and Line Items Included in Consolidated Statements of Comprehensive Income	(e) Expenses recognized in profit or loss for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Current service cost W 210,682 195,850 204,668 Past service cost — — (25,749 ) Net interest cost 10,280 2,391 961 W 220,962 198,241 179,880 Expenses are recognized in the following line items in the consolidated statements of comprehensive income: (In millions of won) 2016 2017 2018 Cost of sales W 177,652 158,418 134,879 Selling expenses 12,513 11,114 11,045 Administrative expenses 16,486 16,287 19,472 Research and development expenses 14,311 12,422 14,484 W 220,962 198,241 179,880
Remeasurements of Net Defined Benefit Liabilities (Assets) Included in Other Comprehensive Income (Loss)	(f) Remeasurements of net defined benefit liabilities (assets) included in other comprehensive income (loss) for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Balance at January 1 W (281,902 ) (163,950 ) (170,510 ) Remeasurements Actuarial profit or loss arising from: Experience adjustment 70,258 (48,890 ) 56,225 Demographic assumptions (4,605 ) (7,702 ) (15,379 ) Financial assumptions 95,429 56,706 (12,961 ) Return on plan assets (5,736 ) (16,374 ) (22,195 ) Share of associates regarding remeasurements 200 441 20 155,546 (15,819 ) 5,710 Income tax (37,594 ) 9,259 (1,169 ) Balance at December 31 W (163,950 ) (170,510 ) (165,969 )
Principal Actuarial Assumptions	(g) Principal actuarial assumptions at the reporting date (expressed as weighted averages) are as follows: 2017 2018 Expected rate of salary increase 4.7 % 4.3 % Discount rate for defined benefit obligations 3.2 % 2.8 % Assumptions regarding future mortality are based on published statistics and mortality tables. The current mortality underlying the values of the liabilities in the defined benefit plans are as follows: December 31, 2017 December 31, 2018 Teens Males 0.01 % 0.01 % Females 0.00 % 0.00 % Twenties Males 0.01 % 0.01 % Females 0.00 % 0.00 % Thirties Males 0.01 % 0.01 % Females 0.01 % 0.01 % Forties Males 0.03 % 0.03 % Females 0.02 % 0.02 % Fifties Males 0.05 % 0.05 % Females 0.02 % 0.02 %
Amounts of Defined Benefit Obligations Affected by Reasonably Possible Changes to Respective Relevant Actuarial Assumptions	(h) Reasonably possible changes to respective relevant actuarial assumptions would have affected the defined benefit obligations by the following amounts as of December 31, 2018: (In millions of won) Defined benefit obligation 1% increase 1% decrease Discount rate for defined benefit obligations W (199,750 ) 241,608 Expected rate of salary increase 236,002 (199,363 )
Defined benefit obligations [member]
Statement [LineItems]
Net Defined Benefit Liabilities, Changes in Present Value of Defined Benefit Obligations and Changes in Fair Value of Plan Assets	(b) Changes in the present value of the defined benefit obligations for the years ended December 31, 2017 and 2018 are as follows: (In millions of won) 2017 2018 Opening defined benefit obligations W 1,401,396 1,562,424 Current service cost 195,850 204,668 Past service cost — (25,749 ) Interest cost 40,844 49,145 Remeasurements (before tax) (114 ) (27,885 ) Benefit payments (76,011 ) (88,562 ) Transfers from (to) related parties 534 (4,217 ) Curtailment of plans — (74,459 ) Others (75 ) 58 Closing defined benefit obligations W 1,562,424 1,595,423
Fair value of plan assets [member]
Statement [LineItems]
Net Defined Benefit Liabilities, Changes in Present Value of Defined Benefit Obligations and Changes in Fair Value of Plan Assets	(c) Changes in fair value of plan assets for the years ended December 31, 2017 and 2018 are as follows: (In millions of won) 2017 2018 Opening fair value of plan assets W 1,258,409 1,466,977 Expected return on plan assets 38,453 48,184 Remeasurements (before tax) (16,374 ) (22,195 ) Contributions by employer directly to plan assets 250,998 212,224 Benefit payments (64,509 ) (80,690 ) Curtailment of plans — (74,437 ) Closing fair value of plan assets W 1,466,977 1,550,063

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Changes in Provisions	Changes in provisions for the year ended December 31, 2017 are as follows: (In millions of won) Litigation and claims Warranties(*) Others Total Balance of January 1, 2017 W — 62,462 1,665 64,127 Additions 43 251,131 170 251,344 Usage and reclassification — (211,143 ) — (211,143 ) Balance at December 31, 2017 W 43 102,450 1,835 104,328 Current W 43 74,138 1,835 76,016 Non-current W — 28,312 — 28,312 Changes in provisions for the year ended December 31, 2018 are as follows: (In millions of won) Litigations and claims Warranties(*) Others Total Balance at January 1, 2018 W 43 102,450 1,835 104,328 Adjustment from adoption of IFRS 15 — — 9,789 9,789 Additions (reversals) — 234,928 (2,694 ) 232,234 Usage (43 ) (215,290 ) — (215,333 ) Balance at December 31, 2018 W — 122,088 8,930 131,018 Current W — 89,324 8,930 98,254 Non-current W — 32,764 — 32,764 (*) The provision for warranties covers defective products and is normally applicable for 18 months from the date of purchase. The warranty liability is calculated by using historical and anticipated rates of warranty claims, and costs per claim to satisfy the Group’s warranty obligation.

Other Liabilities (Tables)

Other Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Other Liabilities	Other liabilities at the reporting date are as follows: (In millions of won) December 31, 2017 December 31, 2018 Current liabilities Withholdings W 63,766 30,970 Unearned revenues 12,225 43,841 Security deposits — 165 W 75,991 74,976 Non-current Long-term accrued expenses W 70,561 80,817 Long-term other accounts payable 2 3,103 Long-term unearned revenue — 2,116 Security deposits — 10,790 W 70,563 96,826

Contingent Liabilities and Co_2

Contingent Liabilities and Commitments (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Maximum Amount of Accounts Receivables Sales and Amount of Sold Accounts Receivables before Maturity by Contract	The respective maximum amount of accounts receivables sales and the amount of sold accounts receivables before maturity by contract are as follows: (In millions of USD and KRW) Classification Financial institutions Maximum Not yet due Contractual amount KRW Contractual KRW Controlling Company Shinhan Bank KRW USD 90,000 25 90,000 — USD 12 — Sumitomo Mitsui Banking Corporation USD 20 22,362 — — KRW 130,000 130,000 KRW 36,089 36,089 Bank of Tokyo-Mitsubishi UFJ USD 40 44,724 USD 40 44,516 BNP Paribas USD 200 223,620 USD 12 13,630 ING Bank USD 150 167,715 USD 31 35,554 USD 435 USD 95 KRW 220,000 706,374 KRW 36,089 143,075 Subsidiaries LG Display Singapore Pte. Ltd. Standard Chartered Bank USD 300 335,430 USD 209 233,364 LG Display Taiwan Co., Ltd. BNP Paribas USD 52 58,141 USD 9 10,063 Australia and New Zealand Banking Group Ltd USD 70 78,267 USD 52 58,142 Taishin International Bank USD 289 323,131 USD 86 96,157 LG Display Germany GmbH Citibank USD 160 178,896 — — BNP Paribas USD 75 83,858 USD 75 83,767 LG Display America, Inc. Hongkong & Shanghai Banking Corp. USD 400 447,240 USD 230 257,164 Standard Chartered Bank USD 600 670,860 USD 515 575,823 Sumitomo Mitsui Banking Corporation USD 80 89,448 USD 67 74,915 LG Display Japan Co., Ltd. Sumitomo Mitsui Banking Corporation USD 20 22,362 — — LG Display Guangzhou Trading Co., Ltd. Industrial and Commercial Bank of China — — — — USD 2,046 2,287,633 USD 1,243 1,389,395 USD 2,481 USD 1,338 KRD 220,000 2,994,007 KRW 36,089 1,532,470

Capital and Reserves (Tables)

Capital and Reserves (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Reserves at Reporting Date	Reserves at the reporting date are as follows: (In millions of won) December 31, 2017 December 31, 2018 Foreign currency translation differences for foreign operations W (259,749 ) (272,474 ) Other comprehensive loss from associates (excluding remeasurements of net defined benefit liabilities) (28,531 ) (28,494 ) W (288,280 ) (300,968 )
Change in Reserves	The movement in reserves for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) Net change in fair value of available-for- sale financial assets Foreign currency for foreign operations Other income (loss) from associates (excluding Total January 1, 2016 W 58 18,196 (24,020 ) (5,766 ) Change in reserves (58 ) (77,238 ) (5,416 ) (82,712 ) December 31, 2016 — (59,042 ) (29,436 ) (88,478 ) January 1, 2017 — (59,042 ) (29,436 ) (88,478 ) Change in reserves — (200,707 ) 905 (199,802 ) December 31, 2017 — (259,749 ) (28,531 ) (288,280 ) January 1, 2018 — (259,749 ) (28,531 ) (288,280 ) Change in reserves — (12,725 ) 37 (12,688 ) December 31, 2018 — (272,474 ) (28,494 ) (300,968 )

Geographic and Other Informat_2

Geographic and Other Information (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Revenue and Non-current Assets by Geography	The following is a summary of sales by region based on the location of the customers for the years ended December 31, 2016, 2017 and 2018. (a) Revenue by geography (In millions of won) Region 2016 2017 2018 Domestic W 1,825,191 1,996,183 1,589,452 Foreign China 18,367,767 18,090,974 15,242,533 Asia (excluding China) 2,148,676 2,383,390 2,481,112 United States 2,053,317 2,724,714 2,462,918 Europe (excluding Poland) 983,672 1,433,126 1,496,138 Poland 1,125,451 1,161,829 1,064,418 24,678,883 25,794,033 22,747,119 W 26,504,074 27,790,216 24,336,571 (b) Non-current (In millions of won) Region December 31, 2017 December 31, 2018 Property, plant and Intangible assets Property, plant and Intangible assets Domestic W 12,487,111 731,373 14,984,688 816,808 Foreign China 2,929,739 17,244 5,049,216 12,332 Others 785,110 164,204 1,566,226 158,502 W 3,714,849 181,448 6,615,442 170,834 W 16,201,960 912,821 21,600,130 987,642
Revenue by Product and Services	(c) Revenue by product and services (In millions of won) Product 2016 2017 2018 Panels for: Televisions W 10,132,520 11,717,982 9,727,260 Desktop monitors 4,035,195 4,393,482 4,040,025 Tablet products 2,695,808 2,369,634 1,990,766 Notebook computers 2,383,532 2,244,088 2,836,888 Mobile and others 7,257,019 7,065,030 5,741,632 W 26,504,074 27,790,216 24,336,571

The Nature of Expenses and Ot_2

The Nature of Expenses and Others (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Classification of Expenses by Nature	The classification of expenses by nature for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Changes in inventories W 63,884 (62,299 ) (341,120 ) Purchases of raw materials, merchandise and others 14,244,942 13,548,848 12,863,812 Depreciation and amortization 3,021,571 3,214,576 3,554,565 Outsourcing fees 819,742 771,697 825,393 Labor costs 3,022,607 3,258,427 3,222,110 Supplies and others 1,053,245 1,239,915 1,010,352 Utility 840,664 865,347 899,075 Fees and commissions 638,732 692,125 722,134 Shipping costs 224,742 249,820 240,288 Advertising 67,636 236,440 112,400 Warranty expenses 166,691 251,131 234,928 Travel 73,807 92,976 104,009 Taxes and dues 74,506 91,806 123,210 Others 927,218 919,051 757,673 W 25,239,987 25,369,860 24,328,829 Total expenses consist of cost of sales, selling, administrative, research and development expenses and other non-operating

Selling and Administrative Ex_2

Selling and Administrative Expenses (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Details of Selling and Administrative Expenses	Details of selling and administrative expenses for the years ended December 31, 2016, 2017, and 2018 are as follows: (In millions of won) 2016 2017 2018 Salaries(*1) W 276,824 327,288 500,610 Expenses related to defined benefit plans(*2) 28,999 27,401 30,724 Other employee benefits 89,717 94,740 90,348 Shipping costs 191,442 214,866 200,434 Fees and commissions 192,786 197,070 221,050 Depreciation 129,225 138,711 174,575 Taxes and dues 30,523 46,317 65,621 Advertising 67,636 236,440 112,400 Warranty expenses 166,691 251,131 234,928 Rent 25,840 26,711 26,691 Insurance 11,561 12,459 11,584 Travel 23,343 27,879 24,659 Training 14,464 16,311 13,309 Others 56,342 73,181 65,343 W 1,305,393 1,690,505 1,772,276 (*1) The expense related to retirement allowance for the year ended December 31, 2018 is W (*2) The expense related to the define contribution plan for the year ended December 31, 2018 is W

Personnel Expenses (Tables)

Personnel Expenses (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Details of Personnel Expenses	Details of personnel expenses for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Salaries and wages W 2,418,869 2,704,217 2,720,014 Other employee benefits 459,730 483,704 500,169 Contributions to National Pension plan 69,588 73,061 75,668 Expenses related to defined benefit plan and defined contribution plan(*) 220,962 198,241 180,737 W 3,169,149 3,459,223 3,476,588 (*) The expense related to the define contribution plan for the year ended December 31, 2018 is W

Other Income and Other Expens_2

Other Income and Other Expenses (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Other Income	(a) Details of other income for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Foreign currency gain W 1,543,909 969,425 970,306 Gain on disposal of property, plant and equipment 14,637 101,227 6,620 Gain on disposal of intangible assets — 308 239 Reversal of impairment loss on intangible assets — 35 348 Rental income 5,152 2,212 3,584 Others 28,103 8,539 23,040 W 1,591,801 1,081,746 1,004,037
Summary of Other Expenses	(b) Details of other expenses for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Foreign currency loss W 1,420,502 1,189,193 1,030,084 Other bad debt expenses — 1,798 4 Loss on disposal of property, plant and equipment 7,466 20,030 15,048 Impairment loss on property, plant and equipment 1,610 — 43,601 Loss on disposal of intangible assets 75 30 — Impairment loss on intangible assets 138 1,809 82 Donations 22,221 17,152 7,698 Expenses related to legal proceedings or claims and others 15,819 443 18,716 W 1,467,831 1,230,455 1,115,233

Finance Income and Finance Co_2

Finance Income and Finance Costs (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Finance Income and Costs Recognized in Profit or Loss	(a) Finance income and costs recognized in profit or loss for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Finance income Interest income W 42,079 60,106 69,020 Foreign currency gain 81,554 210,890 160,989 Gain on disposal of investments in equity accounted investees 11,367 3,669 — Reversal of impairment loss of investments in equity accounted investees — — 802 Gain on transaction of derivatives 4,427 3,106 2,075 Gain on valuation of derivatives 244 1,070 13,059 Gain on disposal of available-for-sale — 8 — Gain on valuation of financial asset at fair value through profit or loss — 170 8,186 W 139,671 279,019 254,131 Finance costs Interest expense W 113,285 90,538 80,517 Foreign currency loss 132,320 126,642 184,309 Loss on disposal of investments in equity accounted investees 5,643 42,112 595 Loss on impairment of investments in equity accounted investees 6,137 4,234 17,397 Loss on impairment of available-for-sale 3,757 1,948 — Loss on valuation of financial asset at fair value through profit or loss 118 — 225 Loss on sale of trade accounts and notes receivable 2,886 784 13,361 Loss on transaction of derivatives 334 514 49 Loss on valuation of derivatives 472 — 26,600 Others 1,234 2,084 3,840 W 266,186 268,856 326,893
Finance Income and Costs Recognized in Other Comprehensive Income or Loss	(b) Finance income and costs recognized in other comprehensive income or loss for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Foreign currency translation differences for foreign operations W (90,503 ) (231,738 ) (19,987 ) Net change in fair value of available-for-sale (77 ) — — Tax effect 19 — — Finance income (costs) recognized in other comprehensive income (loss) after tax W (90,561 ) (231,738 ) (19,987 )

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Details of Income Tax Expense (Benefit)	(a) Details of income tax expense (benefit) for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Current tax expense Current year 361,237 512,123 167,394 Adjustment for prior years — — 82,225 W 361,237 512,123 249,619 Deferred tax expense (benefit) Origination and reversal of temporary differences (49,190 ) (104,835 ) (226,360 ) Change in unrecognized deferred tax assets 72,678 (11,708 ) 64,818 23,488 (116,543 ) (161,542 ) Income tax expense W 384,725 395,580 88,077
Income Taxes Recognized Directly in Other Comprehensive Income	(b) Income taxes recognized directly in other comprehensive income or loss for the years ended December 31, 2016, 2017, and 2018 are as follows: (In millions of won) 2016 Before tax Tax benefit (expense) Net of tax Net change in fair value of available-for-sale W (77 ) 19 (58 ) Remeasurements of net defined benefit liabilities (assets) 155,346 (37,594 ) 117,752 Foreign currency translation differences for foreign operations (90,503 ) — (90,503 ) Change in equity of equity method investee (5,216 ) — (5,216 ) W 59,550 (37,575 ) 21,975 (In millions of won) 2017 Before tax Tax benefit Net of tax Net change in fair value of available-for-sale W — — — Remeasurements of net defined benefit liabilities (assets) (16,260 ) 9,259 (7,001 ) Foreign currency translation differences for foreign operations (231,738 ) — (231,738 ) Change in equity of equity method investee 1,346 — 1,346 W (246,652) 9,259 (237,393 ) (In millions of won) 2018 Before tax Tax expense Net of tax Net change in fair value of available-for-sale W — — — Remeasurements of net defined benefit liabilities (assets) 5,690 (1,169 ) 4,521 Foreign currency translation differences for foreign operations (19,987 ) — (19,987 ) Change in equity of equity method investee 57 — 57 W (14,240) (1,169 ) (15,409 )
Reconciliation of Actual Effective Tax Rate	(c) Reconciliation of the actual effective tax rate for the years ended December 31, 2016, 2017, and 2018 is as follows: (In millions of won) 2016 2017 2018 Profit (loss) before income taxes W 1,316,233 2,332,632 (91,366 ) Income tax using the statutory tax rate of each country 33.49 % 440,753 28.54 % 665,733 (33.60 %) 30,695 Non-deductible 3.39 % 44,606 2.72 % 63,416 (40.07 %) 36,608 Tax credits (11.45 %) (150,663 ) (10.64 %) (248,191 ) 117.27 % (107,146 ) Change in unrecognized deferred tax assets 5.52 % 72,678 (0.50 %) (11,708 ) (70.94 %) 64,818 Adjustment for prior years — — — — (90.00 %) 82,225 Effect on change in tax rate (Note 24(d)) — — (3.10 %) (72,376 ) 15.68 % (14,326 ) Others (1.72 %) (22,649 ) (0.06 %) (1,294 ) 5.25 % (4,797 ) Actual income tax expense W 384,725 395,580 88,077 Actual effective tax rate 29.23 % 16.96 % (*) (*) Actual effective tax rate are not calculated due to loss before income tax.

Deferred Tax Assets and Liabi_2

Deferred Tax Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary Of Unused Tax Credit Carryforwards	The amount of unused tax credit carryforwards for which no deferred tax asset is recognized and their expiration dates are as follows: (In millions of won) December 31, 2019 December 31, 2020 December 31, 2021 December 31, 2022 Tax credit carryforwards W — 58,391 91,862
Details of Deferred Tax Assets and Liabilities	(c) Deferred tax assets and liabilities are attributable to the following: (In millions of won) Assets Liabilities Total December, 31, December, 31, December, 31, December, 31, December, 31, December, 31, Other accounts receivable, net W — — (1,441 ) (1,013 ) (1,441 ) (1,013 ) Inventories, net 34,550 60,606 — — 34,550 60,606 Defined benefit liabilities, net 2,375 — — — 2,375 — Unrealized gain or loss and others 29,061 13,404 — — 29,061 13,404 Accrued expenses 183,903 126,072 — — 183,903 126,072 Property, plant and equipment 409,928 445,721 — (1,495 ) 409,928 444,226 Intangible assets 3,457 3,468 (24,646 ) (14,588 ) (21,189 ) (11,120 ) Provisions 27,018 32,468 — — 27,018 32,468 Gain or loss on foreign currency translation, net 13 13 — — 13 13 Others 27,562 20,850 — (7,665 ) 27,562 13,185 Tax loss carryforwards — 134,845 — — — 134,845 Tax credit carryforwards 268,926 308,393 — — 268,926 308,393 Deferred tax assets (liabilities) W 986,793 1,145,840 (26,087 ) (24,761 ) 960,706 1,121,079
Changes in Deferred Tax Assets and Liabilities	(d) Changes in deferred tax assets and liabilities for the years ended December 31, 2017 and 2018 are as follows: (In millions of won) January 1, Profit or loss Other (loss) December 31, Profit or loss Other December 31, Other accounts receivable, net W (1,190 ) (251 ) — (1,441 ) 428 — (1,013 ) Inventories, net 35,771 (1,221 ) — 34,550 26,056 — 60,606 Defined benefit liabilities, net 10,817 (17,701 ) 9,259 2,375 (1,206 ) (1,169 ) — Subsidiaries and associates 34,777 (5,716 ) — 29,061 (15,657 ) — 13,404 Accrued expenses 122,998 60,905 — 183,903 (57,831 ) — 126,072 Property, plant and equipment 338,860 71,068 — 409,928 34,298 — 444,226 Intangible assets (31,027 ) 9,838 — (21,189 ) 10,069 — (11,120 ) Provisions 15,051 11,967 — 27,018 5,450 — 32,468 Gain or loss on foreign currency translation, net 11 2 — 13 — — 13 Others 21,435 6,127 — 27,562 (14,377 ) — 13,185 Tax loss carryforwards — — — — 134,845 — 134,845 Tax credit carryforwards 287,400 (18,474 ) — 268,926 39,467 — 308,393 Deferred tax assets (liabilities) W 834,903 116,544 9,259 960,706 161,542 (1,169 ) 1,121,079

Earnings (Loss) Per Share Att_2

Earnings (Loss) Per Share Attributable to Owners of the Controlling Company (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Basic Earnings per Share	(a) Basic earnings (loss) per share for the years ended December 31, 2016, 2017 and 2018 are as follows: (In won and No. of shares) 2016 2017 2018 Profit (loss) attributable to owners of the Controlling Company W 906,714,278,688 1,802,756,119,275 (207,239,484,774 ) Weighted-average number of common stocks outstanding 357,815,700 357,815,700 357,815,700 Earnings (loss) per share W 2,534 5,038 (579 )

Financial Risk Management (Tabl

Financial Risk Management (Tables)	12 Months Ended
	Dec. 31, 2018
Statement [LineItems]
Average Exchange Rates Applied during Reporting Periods	Average exchange rates applied during the reporting periods are as follows: (In won) Average rate Reporting date spot rate 2016 2017 2018 December 31, December 31, USD W 1,159.83 1,131.08 1,100.21 1,071.40 1,118.10 JPY 10.67 10.09 9.96 9.49 10.13 CNY 174.40 167.52 166.41 163.65 162.76 TWD 35.97 37.16 36.51 35.92 36.58 EUR 1,283.95 1,277.01 1,298.53 1,279.25 1,279.16 PLN 294.41 299.98 304.87 306.07 297.33 VND 0.0518 0.0498 0.0478 0.0472 0.0482
Maximum Exposure to Credit Risk of Financial Assets	The carrying amount of financial assets represents the maximum credit exposure. The maximum exposure to credit risk as of December 31, 2017 and 2018 are as follows: i) As of December 31, 2017 (In millions of won) December 31, 2017 Cash and cash equivalents W 2,602,560 Deposits in banks 758,089 Trade accounts and notes receivable 4,325,120 Non-trade 150,554 Accrued income 14,273 Available-for-sale 162 Financial assets at fair value through profit or loss 1,552 Deposits 30,378 Short-term loans 16,766 Long-term loans 32,408 Long-term non-trade 8,738 Derivatives 842 W 7,941,442 ii) As of December 31, 2018 (In millions of won) December 31, 2018 Financial assets carried at amortized cost Cash and cash equivalents W 2,365,022 Deposits in banks 78,411 Trade accounts and notes receivable 2,829,163 Non-trade 159,238 Accrued income 10,075 Deposits 91,123 Short-term loans 16,116 Long-term 55,048 Long-term non-trade 11,448 W 5,615,644 Financial assets at fair value through profit or loss Convertible bonds W 1,327 Derivatives 13,059 W 14,386 Financial assets at fair value through other comprehensive income Debt instrument W 161 W 5,630,191
Contractual Maturities of Financial Liabilities, Including Estimated Interest Payments	The following are the contractual maturities of financial liabilities, including estimated interest payments, as of December 31, 2018. ( In millions of won ) Contractual cash flows Carrying Total 6 months 6-12 1-2 2-5 More than Non-derivative Secured bank borrowings W 268,093 268,190 268,190 — — — — Unsecured bank borrowings 5,958,427 6,588,502 565,832 356,688 973,297 4,169,682 523,003 Unsecured bond issues 2,332,257 2,537,553 291,738 328,400 456,990 1,320,248 140,177 Trade accounts and notes payable 3,087,461 3,087,461 3,087,461 — — — — Other accounts payable 3,566,629 3,566,629 3,565,599 1,030 — — — Long-term other accounts payable 3,103 3,103 — — 2,077 1,026 — Security deposits 10,955 10,955 — 165 10,790 — — Derivative financial liabilities Derivatives W 25,758 (35,140 ) (6,742 ) (6,728 ) (12,517 ) (9,153 ) — W 15,252,683 16,027,253 7,772,078 679,555 1,430,637 5,481,803 663,180
Summary of Capital Management	Management’s policy is to maintain a capital base so as to maintain investor, creditor and market confidence and to sustain future development of the business. Liabilities to equity ratio, net borrowings to equity ratio and other financial ratios are used by management to achieve an optimal capital structure. Management also monitors the return on capital as well as the level of dividends to ordinary shareholders. (In millions of won) December 31, 2017 December 31, 2018 Total liabilities W 14,178,177 18,289,464 Total equity 14,981,510 14,886,246 Cash and deposits in banks(*1) 3,360,638 2,443,422 Borrowings (including bonds) 5,603,118 8,558,777 Total liabilities to equity ratio 95 % 123 % Net borrowings to equity ratio(*2) 15 % 41 % (*1) Cash and deposits in banks consist of cash and cash equivalents and current deposit in banks. (*2) Net borrowings to equity ratio is calculated by dividing total borrowings (including bonds) less cash and current deposits in banks by total equity.
Fair Values of Financial Assets and Liabilities, Together with Carrying Amounts Shown in Consolidated Statement of Financial Position	The fair values of financial assets and liabilities, together with the carrying amounts shown in the consolidated statements of financial position as of December 31, 2017 and 2018 are as follows: i) As of December 31, 2017 (In millions of won) December 31, 2017 Carrying Fair values Assets carried at fair value Available-for-sale W 162 162 Financial asset at fair value through profit or loss 1,552 1,552 Derivatives 842 842 Assets carried at amortized cost Cash and cash equivalents W 2,602,560 (*) Deposits in banks 758,089 (*) Trade accounts and notes receivable 4,325,120 (*) Non-trade 150,554 (*) Accrued income 14,273 (*) Deposits 30,378 (*) Short-term loans 16,766 (*) Long-term 32,408 (*) Long-term non-trade 8,738 (*) Liabilities carried at amortized cost Secured bank borrowings W 642,172 642,172 Unsecured bank borrowings 2,950,184 2,955,399 Unsecured bond issues 2,010,762 2,016,086 Trade accounts and notes payable 2,875,090 (*) Other accounts payable 3,169,937 3,170,147 Long-term other accounts payable 2 (*) (*) Excluded from disclosures as the carrying amount approximates fair value. ii) As of December 31, 2018 (In millions of won) December 31, 2018 Carrying amounts Fair values Financial assets carried at amortized cost Cash and cash equivalents W 2,365,022 (*) Deposits in banks 78,411 (*) Trade accounts and notes receivable 2,829,163 (*) Non-trade 159,238 (*) Accrued income 10,075 (*) Deposits 91,123 (*) Short-term loans 16,116 (*) Long-term 55,048 (*) Long-term non-trade 11,448 (*) Financial assets at fair value through profit or loss Equity instrument W 13,681 13,681 Convertible bonds 1,327 1,327 Derivatives 13,059 13,059 Financial assets at fair value through other comprehensive income Debt instrument W 161 161 Financial liabilities at fair value through profit or loss Derivatives W 25,758 25,758 Financial liabilities carried at amortized cost Secured bank borrowings W 268,093 268,093 Unsecured bank borrowings 5,958,427 6,013,903 Unsecured bond issues 2,332,257 2,384,987 Trade accounts and notes payable 3,087,461 (*) Other accounts payable 3,566,629 (*) Long-term other accounts payable 3,103 (*) Security deposits 10,955 (*) (*) Excluded from disclosures as the carrying amount approximates fair value.
Fair Value Hierarchy Classifications of Financial Instruments Measured at Fair Value	Fair value hierarchy classifications of the financial instruments that are measured at fair value as of December 31, 2017 and 2018 are as follows: (In millions of won) Level 1 Level 2 Level 3 Total December 31, 2017 Available-for-sale W 162 — — 162 Financial assets at fair value through profit or loss — — 1,552 1,552 Derivatives — — 842 842 (In millions of won) Level 1 Level 2 Level 3 Total December 31, 2018 Financial assets at fair value through profit or loss Equity instrument W — — 13,681 13,681 Convertible bonds — — 1,327 1,327 Derivatives — — 13,059 13,059 Financial asset at fair value through other comprehensive income Debt instrument W 161 — — 161 Financial liabilities at fair value through profit or loss Derivatives W — — 25,758 25,758
Fair Value Hierarchy Classifications, Valuation Technique and Inputs for Fair Value Measurements of Financial Instruments not Measured at Fair Value	Fair value hierarchy classifications, valuation technique and inputs for fair value measurements of the financial instruments not measured at fair value but for which the fair value is disclosed as of December 31, 2017 and December 31, 2018 are as follows: (In millions of won) December 31, 2017 Valuation technique Input Classification Level 1 Level 2 Level 3 Liabilities Secured bank borrowings W — — 642,172 Discounted cash flow Discount rate Unsecured bank borrowings — — 2,955,399 Discounted cash flow Discount rate Unsecured bond issues — — 2,016,086 Discounted cash flow Discount rate Other accounts payable — — 3,170,147 Discounted cash flow Discount rate (In millions of won) December 31, 2018 Valuation technique Input Classification Level 1 Level 2 Level 3 Liabilities Secured bank borrowings W — — 268,093 Discounted cash flow Discount rate Unsecured bank borrowings — — 6,013,903 Discounted cash flow Discount rate Unsecured bond issues — — 2,384,987 Discounted cash flow Discount rate The interest rates applied for determination of the above fair value at the reporting date are as follows: December 31, 2017 December 31, 2018 Borrowings, bonds and others 1.57~2.92% 2.09~3.37%
Currency risk [member]
Statement [LineItems]
Exposure to Market Risks	The Group’s exposure to foreign currency risk based on notional amounts at the reporting date is as follows: (In millions) December 31, 2017 USD JPY CNY TWD EUR PLN VND Cash and cash equivalents 1,228 152 6,940 16 3 165 342,063 Deposits in banks — — 750 — — — — Trade accounts and notes receivable 3,316 11 1,453 — — — — Non-trade 62 1,340 136 2 9 — 13,405 Other assets denominated in foreign currencies 1 206 596 7 — — 1,882 Trade accounts and notes payable (1,345 ) (14,898 ) (2,843 ) — — — (102,398 ) Other accounts payable (285 ) (14,653 ) (2,403 ) (11 ) (8 ) (4 ) (2,138,370 ) Borrowings (1,500 ) — (3,263 ) — — — — Net exposure 1,477 (27,842 ) 1,366 14 4 161 (1,883,418 ) (In millions) December 31, 2018 USD JPY CNY TWD EUR PLN VND Cash and cash equivalents 790 83 5,515 121 8 206 2,070,889 Trade accounts and notes receivable 2,175 7 1,098 — — — — Non-trade 21 852 201 3 4 — 23,182 Other assets denominated in foreign currencies 33 220 11,157 108 12 23 2,782 Trade accounts and notes payable (863 ) (12,501 ) (2,862 ) — — — (355,390 ) Other accounts payable (928 ) (20,326 ) (4,762 ) (6 ) (3 ) (4 ) (1,585,130 ) Borrowings (2,571 ) — (5,198 ) — — — — Aggregate notional amounts in financial position (1,343 ) (31,665 ) 5,149 226 21 225 156,333 Currency swap contracts 780 — — — — — — Net exposure (563 ) (31,665 ) 5,149 226 21 225 156,333
Sensitivity Analysis for Each Type of Market Risk	A weaker won, as indicated below, against the following currencies which comprise the Group’s assets or liabilities denominated in a foreign currency as of December 31, 2017 and 2018, would have increased (decreased) equity and profit or loss by the amounts shown below. This analysis is based on foreign currency exchange rate variances that the Group considers to be reasonably possible as of the end of the reporting period. The analysis assumes that all other variables, in particular interest rates, would remain constant. The changes in equity and profit or loss would have been as follows: (In millions of won) December 31, 2017 December 31, 2018 Equity Profit or Equity Profit or loss USD (5 percent weakening) W 50,040 91,238 (46,136 ) 38,725 JPY (5 percent weakening) (10,294 ) (9,141 ) (12,060 ) (10,497 ) CNY (5 percent weakening) 13,212 (6,396 ) 41,779 318 TWD (5 percent weakening) 23 1 413 1 EUR (5 percent weakening) 16 594 1,197 390 PLN (5 percent weakening) 2,515 (120 ) 3,451 (236 ) VND (5 percent weakening) (4,445 ) — 273 273
Interest rate risk [Member]
Statement [LineItems]
Exposure to Market Risks	The interest rate profile of the Group’s interest-bearing financial instruments at the reporting date is as follows: (In millions of won) December 31, 2017 December 31, 2018 Fixed rate instruments Financial assets W 3,360,800 2,443,583 Financial liabilities (2,962,671 ) (5,033,515 ) W 398,129 (2,589,932 ) Variable rate instruments Financial liabilities W (2,640,447 ) (3,525,262 )
Sensitivity Analysis for Each Type of Market Risk	For the years ended December 31, 2017 and 2018 a change of 100 basis points in interest rates at the reporting date would have increased (decreased) equity and profit or loss by the amounts shown below for the respective following years. This analysis assumes that all other variables, in particular foreign currency rates, remain constant. (In millions of won) Equity Profit or loss 1%p increase 1%p decrease 1%p increase 1%p decrease December 31, 2017 Variable rate instruments(*) W (17,362 ) 17,362 (17,362 ) 17,362 December 31, 2018 Variable rate instruments(*) W (25,558 ) 25,558 (25,558 ) 25,558 (*) Financial instruments subject to interest rate swap not qualified for hedging are excluded.

Changes in liabilities arisin_2

Changes in liabilities arising from financing activities (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Changes in liabilities arising from financing activities	Changes in liabilities arising from financing activities for the year ended December 31, 2018 are as follows: (In millions of won) Non-cash January 1, 2018 Cash flows from Reclassification Exchange rate effect Effective interest December 31, Short-term borrowings W — (720 ) — 720 — — Current portion of long-term borrowings and bonds 1,452,926 (1,859,098 ) 1,904,888 54,659 532 1,553,907 Long-term 2,644,189 3,882,958 (1,345,520 ) 50,644 — 5,232,271 Bonds 1,506,003 828,169 (559,368 ) (4,172 ) 1,967 1,772,599 W 5,603,118 2,851,309 — 101,851 2,499 8,558,777

Related Parties and Others (Tab

Related Parties and Others (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Significant Transactions, Trade Accounts and Notes Receivable and Payable Occurred in Normal Course of Business with Related Parties	(b) Significant transactions such as sales of goods and purchases of raw material and outsourcing service and others, which occurred in the normal course of business with related parties for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 Purchase and others Sales and others Dividend Purchase of raw material Acquisition of Outsourcing Other costs Joint Venture Suzhou Raken Technology Co., Ltd.(*1) W 59,388 29,902 — — — 543 Associates and their subsidiaries New Optics Ltd. W 2,469 — 50,372 — 7,569 255 New Optics USA, Inc. — — — — 509 — NEWOPTIX RS. SA DE CV 33 — — — — — INVENIA Co., Ltd. 54 — 1,429 48,398 — 261 TLI Inc.(*2) — 101 57,429 — — 2,238 AVACO Co., Ltd.(*2) — 128 703 31,299 — 1,373 AVATEC Co., Ltd. — 265 — — 70,196 1,027 Paju Electric Glass Co., Ltd. — 21,030 453,463 — — 3,674 Shinbo Electric Co., Ltd. 204,637 — 355,607 — 2,449 1,097 Narenanotech Corporation 17 — 513 24,821 — 909 WooRee E&L Co., Ltd. — — — — — 32 YAS Co., Ltd. 44 — 2,076 80,836 — 1,758 LB Gemini New Growth Fund No. 16 — 8,394 — — — — W 207,254 29,918 921,592 185,354 80,723 12,624 ( In millions of won ) 2016 Purchase and others Sales and others Dividend Purchase of Acquisition of Outsourcing Other costs Entity that has significant influence over the Controlling Company LG Electronics Inc. W 1,580,279 — 23,047 538,175 — 103,158 Subsidiaries of the entity that has significant influence over the Controlling Company LG Electronics India Pvt. Ltd. W 75,591 — — — — 69 LG Electronics Vietnam Haiphong Co., Ltd. 162,893 — — — — 141 LG Electronics Nanjing New Technology Co., Ltd. 229,773 — — 293 — 1,876 LG Electronics RUS, LLC 127,316 — — — — 2,993 LG Electronics do Brasil Ltda. 133,903 — — — — 3,430 LG Innotek Co., Ltd. 11,503 — 209,878 — — 9,873 Qingdao LG Inspur Digital Communication Co., Ltd. 47,804 — — — — — Inspur LG Digital Mobile Communications Co., Ltd. 370,966 — — — — 5 LG Electronics Mexicalli, S.A. DE C.V. 210,021 — — — — 77 LG Electronics Mlawa Sp. z o.o. 709,558 — — — — 895 LG Electronics Taiwan Taipei Co., Ltd. 11,919 — — — — 27 ( In millions of won ) 2016 Sales and others Purchase and others Dividend Purchase of Acquisition of Outsourcing Other costs LG Electronics Wroclaw Sp. z o.o. W 290,785 — — — — 99 LG Hitachi Water Solutions Co., Ltd. — — — 167,987 — 2,782 LG Electronics Reynosa, S.A. DE C.V. 1,074,790 — — — — 1,907 LG Electronics Almaty Kazakhstan 15,953 — — — — 33 LG Electronics Air-Conditioning — — — 4,994 — 259 Hi Entech Co., Ltd. — — — — — 25,365 Hientech (Tianjin) Co., Ltd. — — — 28,587 — 10,613 LG Electronics S.A. (Pty) Ltd 21,236 — — — — 39 Others 2,289 — — — — 4,094 W 3,496,300 — 209,878 201,861 — 64,577 W 5,343,221 59,820 1,154,517 925,390 80,723 180,902 (*1) Represents transactions occurred prior to exchange of equity interests. (*2) Represent transactions occurred prior to disposal of the entire investments. ( In millions of won ) 2017 Sales and others Purchase and others Dividend Purchase of Acquisition of Outsourcing Other costs Associates and their subsidiaries New Optics Ltd.(*) W 1 — — — 4 6 INVENIA Co., Ltd. — — 1,862 66,548 — 2,259 AVATEC Co., Ltd. — 530 — — 90,785 720 Paju Electric Glass Co., Ltd. — 8,109 380,815 — — 4,225 Shinbo Electric Co., Ltd.(*) 15,812 — — — — 21 Narenanotech Corporation(*) — — 279 21,727 — 244 WooRee E&L Co., Ltd. — — — — — 175 YAS Co., Ltd. — — 6,347 69,243 — 2,474 W 15,813 8,639 389,303 157,518 90,789 10,124 Entity that has significant influence over the Controlling Company LG Electronics Inc. W 1,689,381 — 47,898 906,427 — 109,865 Subsidiaries of the entity that has significant influence over the Controlling Company LG Electronics India Pvt. Ltd. W 71,597 — — — — 163 LG Electronics Vietnam Haiphong Co., Ltd. 205,934 — — 8,892 — 198 ( In millions of won ) 2017 Sales and others Purchase and others Dividend Purchase of Acquisition of Outsourcing Other LG Electronics Nanjing New Technology Co., Ltd. W 300,785 — — 245 — 379 LG Electronics RUS, LLC 103,479 — — — — 963 LG Electronics do Brasil Ltda. 228,821 — — — — 430 LG Innotek Co., Ltd. 14,836 — 199,896 — — 5,692 Qingdao LG Inspur Digital Communication Co., Ltd. 77,787 — — — — — Inspur LG Digital Mobile Communications Co., Ltd. 230,832 — — — — — LG Electronics Mexicalli, S.A. DE C.V. 319,772 — — — — 186 LG Electronics Mlawa Sp. z o.o. 847,565 — — — — 985 LG Electronics Taiwan Taipei Co., Ltd. 13,693 — — — — 164 LG Hitachi Water Solutions Co., Ltd. — — — 318,978 — 1,532 LG Electronics Reynosa, S.A. DE C.V. 1,287,340 — — — — 1,926 LG Electronics Almaty Kazakhstan 14,079 — — — — 53 LG Electronics Air-Conditioning — — 255 3,744 — 2,621 HiEntech Co., Ltd. — — — 6,991 — 34,432 Hientech (Tianjin) Co., Ltd. — — — 21,838 — 11,822 LG Electronics S.A. (Pty) Ltd. 14,155 — — — — 25 Others 857 — 3 14 — 7,264 W 3,731,532 — 200,154 360,702 — 68,835 W 5,436,726 8,639 637,355 1,424,647 90,789 188,824 (*) Represents transactions occurred prior to disposal of the entire investments. ( In millions of won ) 2018 Sales and others Purchase and others Dividend Purchase of Acquisition of Outsourcing Other costs Associates and their subsidiaries INVENIA Co., Ltd. — 30 1,608 58,111 — 896 AVATEC Co., Ltd. — 530 — — 71,403 905 Paju Electric Glass Co., Ltd. — 4,172 364,183 — — 4,411 WooRee E&L Co., Ltd. — — 58 — — 144 YAS Co., Ltd. — — 5,281 143,192 — 3,391 LB Gemini New Growth Fund No. 16 1,112 540 — — — — W 1,112 5,272 371,130 201,303 71,403 9,747 Entity that has significant influence over the Controlling Company LG Electronics Inc. W 1,215,153 — 36,522 1,041,563 — 127,775 Subsidiaries of the entity that has significant influence over the Controlling Company LG Electronics India Pvt. Ltd. W 71,798 — — — — 103 LG Electronics Vietnam Haiphong Co., Ltd. 173,051 — — 4,541 — 166 ( In millions of won ) 2018 Sales and others Purchase and others Dividend Purchase of Acquisition of Outsourcing Other costs LG Electronics Nanjing New Technology Co., Ltd. W 223,524 — — 424 — 1,528 LG Electronics RUS, LLC 106,631 — — — — 2,673 LG Electronics do Brasil Ltda. 192,775 — — — — 350 LG Innotek Co., Ltd. 29,267 — 147,453 — — 39,136 Qingdao LG Inspur Digital Communication Co., Ltd. 37,738 — — — — — Inspur LG Digital Mobile Communications Co., Ltd. 131,970 — — — — 1 LG Electronics Mexicalli, S.A. DE C.V. 187,844 — — — — 210 LG Electronics Mlawa Sp. z o.o. 740,784 — — — — 631 LG Electronics Taiwan Taipei Co., Ltd. 12,746 — — — — 330 LG Hitachi Water Solutions Co., Ltd. 9,100 — — 304,365 — 8,980 LG Electronics Reynosa, S.A. DE C.V. 1,030,414 — — — — 2,021 LG Electronics Almaty Kazakhstan 3,759 — — — — 42 LG Electronics Air-Conditioning — — 330 26,871 — 7,264 HiEntech Co., Ltd. — — — 22,378 — 29,215 Hientech (Tianjin) Co., Ltd. — — — 92,900 — 23,880 LG Electronics S.A. (Pty) Ltd. 7,244 — — — — 20 LG Electronics Egypt S.A.E. 25,491 — — — — 16 Others 5,195 — 28 15 — 11,480 W 2,989,331 — 147,811 451,494 — 128,046 W 4,205,596 5,272 555,463 1,694,360 71,403 265,568 (c) Trade accounts and notes receivable and payable as of December 31, 2017and 2018 are as follows: ( In millions of won ) Trade accounts and notes receivable and others Trade accounts and notes payable and others December 31, 2017 December 31, 2018 December 31, 2017 December 31, 2018 Associates INVENIA Co., Ltd. 2,375 2,000 18,662 30,179 AVATEC Co., Ltd. — — 2,949 4,382 Paju Electric Glass Co., Ltd. — — 60,141 60,566 WooRee E&L Co., Ltd. — — 61 7 YAS Co., Ltd. 375 — 6,474 6,145 W 2,750 2,000 88,287 101,279 Entity that has significant influence over the Controlling Company LG Electronics Inc. W 550,335 247,679 257,071 430,677 Subsidiaries of the entity that has significant influence over the Controlling Company LG Electronics do Brasil Ltda. W 19,091 15,608 10 62 LG Electronics RUS, LLC 25,102 22,570 80 90 LG Innotek Co., Ltd. 407 2,885 62,675 47,382 Qingdao LG Inspur Digital Communication Co., Ltd. 13,061 3,530 — — Inspur LG Digital Mobile Communications Co., Ltd. 55,278 13,172 — — ( In millions of won ) Trade accounts and notes receivable and others Trade accounts and notes payable and others December 31, 2017 December 31, 2018 December 31, 2017 December 31, 2018 LG Electronics Mexicali, S.A. DE C.V. W 29,440 15,305 — — LG Electronics Mlawa Sp. z o.o. 136,874 70,236 25 33 LG Electronics Nanjing New Technology Co., Ltd. 46,373 43,463 699 139 LG Electronics Reynosa, S.A. DE C.V. 137,413 69,189 82 134 LG Electronics Vietnam Haiphong Co., Ltd. 36,017 25,544 3,917 — LG Hitachi Water Solutions Co., Ltd. — 9,100 154,864 50,425 Hientech (Tianjin) Co., Ltd. — — 5,600 16,345 HiEntech Co., Ltd. — — 6,679 16,816 LG Electronics India Pvt. Ltd. 3,030 9,047 — 29 LG Electronics Egypt S.A.E. — 10,296 1 — LG Electronics Air-Conditioning — — — 17,654 Others 7,618 5,263 1,714 1,246 W 509,704 315,208 236,346 150,355 W 1,062,789 564,887 581,704 682,311
Details of Significant Cash Transactions of Loans and Collection of Loans Occurred in Normal Course of Business with Related Parties	(d) Details of significant cash transactions such as loans and collection of loans, which occurred in the normal course of business with related parties for the years ended December 31, 2017 and 2018 are as follows: (In millions of won) Loans(*1) Associates January 1, 2017 Increase Decrease December 31, 2017 New Optics Ltd.(*2) W 1,000 — 125 875 INVENIA Co., Ltd. 833 2,000 458 2,375 Narenanotech Corporation(*2) 300 — 75 225 YAS Co., Ltd. 833 — 458 375 W 2,966 2,000 1,116 3,850 (*1) Loans are presented based on nominal amounts. (*2) Excluded from related parties due to disposal of equity investments during the year ended December 31, 2017. (In millions of won) Loans(*) Associates January 1, 2018 Increase Decrease December 31, 2018 INVENIA Co., Ltd. W 2,375 — 375 2,000 YAS Co., Ltd. 375 — 375 — W 2,750 — 750 2,000 (*) Loans are presented based on nominal amounts.
Compensation Costs of Key Management	Compensation costs of key management for the years ended December 31, 2016, 2017 and 2018 are as follows: (In millions of won) 2016 2017 2018 Short-term benefits W 2,323 3,724 2,622 Expenses related to the defined benefit plan 897 488 794 W 3,220 4,212 3,416

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Summary of Non-cash Investing and Financing Activities	Supplemental cash flow information for the years ended December 31, 2016, 2017 and 2018 is as follows: (In millions of won) 2016 2017 2018 Non-cash Changes in other accounts payable arising from the purchase of property, plant and equipment W 809,406 632,355 516,734

Non-current Assets Held for S_2

Non-current Assets Held for Sale (Tables)	12 Months Ended
	Dec. 31, 2018
Text block [abstract]
Schedule of Non-current Assets as Held for Sale	Non-current (In millions of won) December 31, 2018 Property, plant and equipment W 70,161

Reporting Entity - Additional I

Reporting Entity - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of reporting entity [line items]
Distributed dividends from consolidated subsidiaries	₩ 178,908	₩ 178,908	₩ 178,908
Common stock [member]
Disclosure of reporting entity [line items]
Common stock outstanding	357,815,700
American depository shares (one represents one-half of one share of common stock) [member]
Disclosure of reporting entity [line items]
Common stock outstanding	20,890,926
Consolidated subsidiaries [member]
Disclosure of reporting entity [line items]
Distributed dividends from consolidated subsidiaries	₩ 90,281	₩ 603,493	₩ 349,977
Entity that has significant influence over the controlling company [member] | LG Electronics Inc. [member]
Disclosure of reporting entity [line items]
Percentage of Controlling Company's equity interests held by a major shareholder	37.90%
Common stock shares of Controlling Company held by a major shareholder	135,625,000

Reporting Entity - Summary of C

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, 2018KRW (₩)	Dec. 31, 2018CNY (¥)	Dec. 31, 2018USD ($)	Dec. 31, 2018EUR (€)	Dec. 31, 2018JPY (¥)	Dec. 31, 2018PLN (zł)	Dec. 31, 2018TWD ($)	Dec. 31, 2017KRW (₩)
Disclosure of subsidiaries [line items]
Fiscal year end	--12-31
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
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. 5, 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
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
LG Display Poland Sp. z o.o. [member]
Disclosure of subsidiaries [line items]
Location	Wroclaw, Poland
Percentage of ownership	100.00%
Fiscal year end	--12-31
Date of incorporation	Sep. 6, 2005
Business	Manufacture Display products
Capital stocks | zł						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
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
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. 5, 2010
Business	Manufacture and sell LCD module and LCD monitor sets
Capital stocks		116
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
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	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
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
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	Herndon, 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
LG Display Vietnam Haiphong Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Location	Haiphong Vietnam
Percentage of ownership	100.00%
Fiscal year end	--12-31
Date of incorporation	May 5, 2016
Business	Manufacture Display products
Capital stocks | $			300
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. 1, 2016
Business	Manufacture and sell LCD module and LCD monitor sets
Capital stocks		637
LG DISPLAY FUND I 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	May 1, 2015
Business	Invest in venture business and obtain technologies
Capital stocks | $			$ 2
LG Display High-Tech (China) Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Location	Guangzhou, China
Percentage of ownership	69.00%
Fiscal year end	--12-31
Date of incorporation	Jul. 11, 2018
Business	Manufacture Display products
Capital stocks		¥ 6,517
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 | ₩	₩ 24,501

Reporting Entity - Summary of_2

Reporting Entity - Summary of Consolidated Subsidiaries (Parenthetical) (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)
LG Display Vietnam Haiphong Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Cash contribution for capital increase in consolidated subsidiaries	₩ 212,600
Percentage of ownership	100.00%
LG DISPLAY FUND I LLC [member]
Disclosure of subsidiaries [line items]
Percentage of ownership	100.00%
LG Display High-Tech (China) Co., Ltd. [member]
Disclosure of subsidiaries [line items]
Percentage of ownership	69.00%
Money market trust [member]
Disclosure of subsidiaries [line items]
Percentage of ownership	100.00%
Acquired value	₩ 24,501

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail) - KRW (₩)	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [Line Items]
Financial liabilities measured at FVTPL			₩ 0
Reclassified inventories to property plant and equipment		₩ 111,456
Impact of IFRS 16 Leases [member]
Disclosure of detailed information about financial instruments [Line Items]
Impact of consolidated financial statements after adoption of IFRS 16		1.00%
Initial Adoption of IFRS 9 [member] | Retained earnings [member]
Disclosure of detailed information about financial instruments [Line Items]
Impact on opening balance of retained earnings	₩ 0
Mask and Mold [member]
Disclosure of detailed information about financial instruments [Line Items]
Estimated useful lives of the assets		P2Y

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Schedule of Changes in Each Class of Financial Assets from Original Measurement Categories under IAS39 to Measurement Categories under IFRS 9 (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financial assets
Cash and cash equivalents	₩ 2,365,022		₩ 2,602,560	₩ 1,558,696	₩ 751,662
Deposits	78,400		758,078
Trade receivables	₩ 2,829,163		₩ 4,325,120
IAS 39 [member]
Financial assets
Financial assets		₩ 7,946,422
Loans and receivables, category [member] | IAS 39 [member]
Financial assets
Cash and cash equivalents		2,602,560
Deposits		758,089
Trade receivables		4,325,120
Other receivables		173,565
Others		79,552
Available-for-sale financial assets [member] | IAS 39 [member]
Financial assets
Debt instrument		162
Equity instrument		4,980
Designated as at FVTPL [member] | IAS 39 [member]
Financial assets
Convertible bonds		1,552
Derivatives		842
IFRS9 [member]
Financial assets
Financial assets		7,946,422
IFRS9 [member] | Financial assets at amortised cost, category [member]
Financial assets
Cash and cash equivalents		2,602,560
Deposits		758,089
Trade receivables		4,325,120
Other receivables		173,565
Others		79,552
IFRS9 [member] | Financial assets at fair value through other comprehensive income, category [member]
Financial assets
Debt instrument		162
IFRS9 [member] | Mandatorily at FVTPL [member]
Financial assets
Equity instrument		4,980
Convertible bonds		1,552
Derivatives		₩ 842

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Schedule of Effect on Application of IFRS 15 on Group's Consolidated Statement of Financial Position (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current assets
Other current assets	₩ 546,048	₩ 241,928
Current liabilities
Provisions	98,254
Increase (decrease) due to application of IFRS 15 [member]
Current assets
Other current assets	(7,489)
Current liabilities
Provisions	(7,489)
Amounts (Balance) without adoption of IFRS 15 [member]
Current assets
Other current assets	538,559
Current liabilities
Provisions	₩ 90,765

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2018
Buildings and structures [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Estimated useful lives of the assets	20 years
Buildings and structures [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Estimated useful lives of the assets	40 years
Machinery [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Estimated useful lives of the assets	4 years
Machinery [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Estimated useful lives of the assets	5 years
Furniture and fixtures [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Estimated useful lives of the assets	4 years
Equipment, tools and vehicles [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Estimated useful lives of the assets	2 years
Equipment, tools and vehicles [member] | Bottom of range [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Estimated useful lives of the assets	4 years
Equipment, tools and vehicles [member] | Top of range [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Estimated useful lives of the assets	12 years

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Schedule of Impact on Depreciation Expense of Property Plant and Equipment and Newly Acquired Property Plant and Equipment (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [Line Items]
Increase (decrease) in depreciation expense			₩ 3,123,659	₩ 2,791,883	₩ 2,643,445
Depreciation Adjustment [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Increase (decrease) in depreciation expense	₩ 52,009	₩ 58,364	₩ (110,373)

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Estimated Useful Lives of Intangible Assets, Other Than Goodwill (Detail)	12 Months Ended
	Dec. 31, 2018
Intellectual property rights [member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [Line Items]
Estimated useful lives of intangible assets, other than goodwill	5 years
Intellectual property rights [member] | Top of range [member]
Disclosure of detailed information about intangible assets [Line Items]
Estimated useful lives of intangible assets, other than goodwill	10 years
Rights to use electricity, water and gas supply facilities [member]
Disclosure of detailed information about intangible assets [Line Items]
Estimated useful lives of intangible assets, other than goodwill	10 years
Software [member]
Disclosure of detailed information about intangible assets [Line Items]
Estimated useful lives of intangible assets, other than goodwill	4 years
Customer relationships [member] | Bottom of range [member]
Disclosure of detailed information about intangible assets [Line Items]
Estimated useful lives of intangible assets, other than goodwill	7 years
Customer relationships [member] | Top of range [member]
Disclosure of detailed information about intangible assets [Line Items]
Estimated useful lives of intangible assets, other than goodwill	10 years
Technology [member]
Disclosure of detailed information about intangible assets [Line Items]
Estimated useful lives of intangible assets, other than goodwill	10 years
Development costs [member]
Disclosure of detailed information about intangible assets [Line Items]
Estimated useful lives of intangible assets, other than goodwill	Life cycle of developed products
Condominium and golf club memberships [member]
Disclosure of detailed information about intangible assets [Line Items]
Estimated useful lives of intangible assets, other than goodwill	Indefinite and not amortized

Cash and Cash Equivalents and_3

Cash and Cash Equivalents and Deposits in Banks - Summary of Cash and Cash Equivalents and Deposits in Banks (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents, Demand deposits	₩ 2,365,022	₩ 2,602,560	₩ 1,558,696	₩ 751,662
Deposits in banks, Time deposits	4,318	685,238
Deposits in banks, Restricted cash	74,082	72,840
Deposits in banks	78,400	758,078
Non-current assets
Deposits in banks, Restricted cash	11	11
Cash and cash equivalents and deposits in banks	₩ 2,443,433	₩ 3,360,649

Receivables and Other Assets -

Receivables and Other Assets - Summary of Trade Accounts and Notes Receivable (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial assets [Line Items]
Trade accounts and notes receivable, net	₩ 2,829,163	₩ 4,325,120
Related parties [member]
Disclosure of financial assets [Line Items]
Trade accounts and notes receivable, net	523,795	1,049,218
Trade, net [member]
Disclosure of financial assets [Line Items]
Trade accounts and notes receivable, net	₩ 2,305,368	₩ 3,275,902

Receivables and Other Assets _2

Receivables and Other Assets - Summary of Other Accounts Receivable (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial assets [abstract]
Non-trade receivable, net	₩ 159,238	₩ 150,554
Accrued income	10,075	14,273
Other accounts receivable, net	169,313	164,827
Long-term non-trade receivable	11,448	8,738
Other non-current accounts receivable, net	₩ 180,761	₩ 173,565

Receivables and Other Assets _3

Receivables and Other Assets - Additional Information (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial assets [Line Items]
Other accounts receivable, net	₩ 169,313	₩ 164,827
Related parties [member]
Disclosure of financial assets [Line Items]
Other accounts receivable, net	₩ 39,092	₩ 10,821

Receivables and Other Assets _4

Receivables and Other Assets - Aging of Trade Accounts and Notes Receivable, Other Accounts Receivable and Long-term Non-trade Receivable (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial assets that are either past due or impaired [Line Items]
Trade accounts and notes receivable	₩ 2,829,163	₩ 4,325,120
Other accounts receivable	169,313	164,827
Gross carrying amount [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Trade accounts and notes receivable	2,829,640	4,326,752
Other accounts receivable	182,042	174,876
Gross carrying amount [member] | Not past due [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Trade accounts and notes receivable	2,807,598	4,323,465
Other accounts receivable	177,689	173,493
Gross carrying amount [member] | Past due [member] | 1-15 days [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Trade accounts and notes receivable	21,558	2,652
Other accounts receivable	3,148	488
Gross carrying amount [member] | Past due [member] | 16-30 days [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Trade accounts and notes receivable	454	631
Other accounts receivable	441	65
Gross carrying amount [member] | Past due [member] | 31-60 days [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Trade accounts and notes receivable	30
Other accounts receivable	96	208
Gross carrying amount [member] | Past due [member] | More than 60 days [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Trade accounts and notes receivable		4
Other accounts receivable	668	622
Accumulated impairment [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Trade accounts and notes receivable	(477)	(1,632)
Other accounts receivable	(1,281)	(1,311)
Accumulated impairment [member] | Not past due [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Trade accounts and notes receivable	(473)	(1,631)
Other accounts receivable	(816)	(905)
Accumulated impairment [member] | Past due [member] | 1-15 days [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Trade accounts and notes receivable	(4)	(1)
Other accounts receivable	(26)	(3)
Accumulated impairment [member] | Past due [member] | 16-30 days [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Other accounts receivable	(4)	(1)
Accumulated impairment [member] | Past due [member] | 31-60 days [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Other accounts receivable	(1)	(2)
Accumulated impairment [member] | Past due [member] | More than 60 days [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Other accounts receivable	₩ (434)	₩ (400)

Receivables and Other Assets _5

Receivables and Other Assets - Movement in Allowance for Impairment in Respect of Trade Accounts and Notes Receivable and Other Accounts Receivable (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other accounts receivable [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Balance at the beginning of the year	₩ 1,311	₩ 1,116	₩ 618
(Reversal of) bad debt expense	(30)	195	498
Balance at the end of the year	1,281	1,311	1,116
Trade accounts and notes receivable [member]
Disclosure of financial assets that are either past due or impaired [Line Items]
Balance at the beginning of the year	1,632	1,488	1,507
(Reversal of) bad debt expense	(1,155)	144	(19)
Balance at the end of the year	₩ 477	₩ 1,632	₩ 1,488

Receivables and Other Assets _6

Receivables and Other Assets - Summary of Other Assets (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current assets
Advance payments	₩ 13,259	₩ 7,973
Prepaid expenses	89,110	83,626
Value added tax refundable	436,190	148,351
Emission rights		1,978
Right to recover returned goods	7,489
Other current assets	546,048	241,928
Non-current assets
Long-term prepaid expenses	₩ 381,983	₩ 394,759

Other Financial Assets - Summar

Other Financial Assets - Summary of Other Financial Assets (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current assets
Deposits		₩ 10,480
Short-term loans	₩ 16,116	16,766
Other current financial assets	46,301	27,252
Non-current assets
Financial asset at fair value through profit or loss		1,552
Other non-current financial assets	144,214	59,836
Derivatives [member]
Current assets
Current Financial Assets At Fair value through profit Or loss	13,059
Non-current assets
Other non-current financial assets		842
Debt securities [member] | Government bonds [member]
Current assets
Debt instrument Government bonds		6
Current financial assets measured at fair Value through Other Comprehensive Income	106
Non-current assets
Non-current available-for-sale financial assets		156
Deposits [member]
Current assets
Current Financial Assets At Amortised Cost	17,020
Non-current assets
Other non-current financial assets	74,103
Short term Loans And Receivables[member]
Current assets
Current Financial Assets At Amortised Cost	16,116
Equity securities [member]
Non-current assets
Financial asset at fair value through profit or loss	13,681
Non-current available-for-sale financial assets		4,980
Equity securities [member] | Intellectual Discovery Co., Ltd. [member]
Non-current assets
Financial asset at fair value through profit or loss	4,598
Non-current available-for-sale financial assets		729
Equity securities [member] | Kyulux, Inc. [member]
Non-current assets
Financial asset at fair value through profit or loss	2,460
Non-current available-for-sale financial assets		1,968
Equity securities [member] | Fineeva Co., Ltd [member]
Non-current assets
Financial asset at fair value through profit or loss	286
Equity securities [member] | ARCH Venture Fund Vill, L.P. [member]
Non-current assets
Financial asset at fair value through profit or loss	6,337
Non-current available-for-sale financial assets		2,283
Convertible bonds [member]
Non-current assets
Financial asset at fair value through profit or loss	1,327
Debt Instruments [member] | Government bonds [member]
Non-current assets
Non-current available-for-sale financial assets	55
Long term Loans And Receivables [member]
Non-current assets
Other non-current financial assets	₩ 55,048
Deposits [member]
Non-current assets
Other non-current financial assets		19,898
Long-term loans [member]
Non-current assets
Other non-current financial assets		₩ 32,408

Other Financial Assets - Additi

Other Financial Assets - Additional Information (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Related parties [member]
Disclosure of financial assets [Line Items]
Other financial assets	₩ 2,000	₩ 2,750

Inventories - Summary of Invent

Inventories - Summary of Inventories (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Classes of current inventories [abstract]
Finished goods	₩ 1,084,297	₩ 965,643
Work-in-process	856,388	748,592
Raw materials	554,720	344,997
Supplies	195,798	290,852
Inventories	₩ 2,691,203	₩ 2,350,084

Inventories - Inventories Recog

Inventories - Inventories Recognized as Cost of Sales and Inventory Write-downs Included in Cost of Sales (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Write-downs (reversals of write-downs) of inventories [abstract]
Inventories recognized as cost of sales	₩ 21,251,305	₩ 22,424,661	₩ 22,754,270
Including: inventory write-downs	₩ 313,180	₩ 206,127	₩ 204,123

Investments in Equity Account_3

Investments in Equity Accounted Investees - Summary of Associates (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of associates and joint ventures [Line Items]
Fiscal year end	--12-31
Carrying amount	₩ 113,989	₩ 122,507	₩ 172,683
Paju Electric Glass Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Location	Paju, South Korea
Fiscal year end	--12-31
Date of incorporation	2005-01
Business	Manufacture electric glass for FPDs
Percentage of ownership	40.00%	40.00%
Carrying amount	₩ 47,823	₩ 46,511	₩ 52,750
INVENIA Co., Ltd. (LIG INVENIA Co., Ltd.) [member]
Disclosure of associates and joint ventures [Line Items]
Location	Seongnam, South Korea
Fiscal year end	--12-31
Date of incorporation	2001-01
Business	Develop and manufacture equipment for FPDs
Percentage of ownership	13.00%	13.00%
Carrying amount	₩ 4,166	₩ 2,887
WooRee E&L Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Location	Ansan, South Korea
Fiscal year end	--12-31
Date of incorporation	2008-06
Business	Manufacture LED back light unit packages
Percentage of ownership	14.00%	14.00%
Carrying amount	₩ 4,746	₩ 7,270
LB Gemini new growth fund no.16 [member]
Disclosure of associates and joint ventures [Line Items]
Location	Seoul, South Korea
Fiscal year end	--12-31
Date of incorporation	2009-12
Business	Invest in small and middle sized companies and benefit from M&A opportunities
Percentage of ownership		31.00%
Carrying amount		₩ 5,910
YAS Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Location	Paju, South Korea
Fiscal year end	--12-31
Date of incorporation	2002-04
Business	Develop and manufacture deposition equipment for OLEDs
Percentage of ownership	15.00%	15.00%
Carrying amount	₩ 16,308	₩ 15,888
AVATEC Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Location	Daegu, South Korea
Fiscal year end	--12-31
Date of incorporation	2000-08
Business	Process and sell electric glass for FPDs
Percentage of ownership	17.00%	17.00%
Carrying amount	₩ 23,441	₩ 23,732
Arctic Sentinel, Inc. (Fuhu, Inc.) [member]
Disclosure of associates and joint ventures [Line Items]
Location	Los Angeles, U.S.A.
Fiscal year end	--03-31
Date of incorporation	2008-06
Business	Develop and manufacture tablet for kids
Percentage of ownership	10.00%	10.00%
CYNORA GmbH [member]
Disclosure of associates and joint ventures [Line Items]
Location	Bruchsal, Germany
Fiscal year end	--12-31
Date of incorporation	2003-03
Business	Develop organic emitting materials for displays and lighting devices
Percentage of ownership	14.00%	14.00%
Carrying amount	₩ 8,668	₩ 20,309
Material Science Co Ltd [member]
Disclosure of associates and joint ventures [Line Items]
Location	Seoul, South Korea
Fiscal year end	--12-31
Date of incorporation	2014-01
Business	Develop, manufacture, and sell materials for display
Percentage of ownership	10.00%
Carrying amount	₩ 3,346
Nanosys Inc [member]
Disclosure of associates and joint ventures [Line Items]
Location	Milpitas, U.S.A.
Fiscal year end	--12-31
Date of incorporation	2001-07
Business	Develop, manufacture, and sell materials for display
Percentage of ownership	4.00%
Carrying amount	₩ 5,491

Investments in Equity Account_4

Investments in Equity Accounted Investees - Summary of Associates (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	1 Months Ended		12 Months Ended
	May 31, 2018	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of associates and joint ventures [Line Items]
Capital distribution received			₩ 4,527	₩ 13,128	₩ 29,745
Impairment loss recognised in profit or loss			₩ (16,595)	₩ (4,234)
INVENIA Co., Ltd. (LIG INVENIA Co., Ltd.) [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			13.00%	13.00%
WooRee E&L Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			14.00%	14.00%
Reversal of impairment loss recognised in profit or loss				₩ 802
LB Gemini new growth fund no.16 [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership				31.00%
Capital distribution received			₩ 1,545
Impairment loss recognised in profit or loss			₩ 385
YAS Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			15.00%	15.00%
AVATEC Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			17.00%	17.00%
Arctic Sentinel, Inc. (Fuhu, Inc.) [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			10.00%	10.00%
CYNORA GmbH [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			14.00%	14.00%
Impairment loss recognised in profit or loss			₩ 11,641
Material Science Co Ltd [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			10.00%
Impairment loss recognised in profit or loss		₩ 671
Investments in associates		₩ 4,000
Number of preferred stock shares acquired		10,767
Nanosys Inc [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			4.00%
Impairment loss recognised in profit or loss	₩ 5,085
Investments in associates	₩ 10,732
Number of preferred stock shares acquired	5,699,954
Entity that has significant influence over the controlling company [member] | Top of range [member] | INVENIA Co., Ltd. (LIG INVENIA Co., Ltd.) [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			20.00%
Entity that has significant influence over the controlling company [member] | Top of range [member] | WooRee E&L Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			20.00%
Entity that has significant influence over the controlling company [member] | Top of range [member] | YAS Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			20.00%
Entity that has significant influence over the controlling company [member] | Top of range [member] | AVATEC Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			20.00%
Entity that has significant influence over the controlling company [member] | Top of range [member] | Arctic Sentinel, Inc. (Fuhu, Inc.) [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			20.00%
Entity that has significant influence over the controlling company [member] | Top of range [member] | CYNORA GmbH [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			20.00%
Entity that has significant influence over the controlling company [member] | Top of range [member] | Material Science Co Ltd [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			20.00%
Entity that has significant influence over the controlling company [member] | Top of range [member] | Nanosys Inc [member]
Disclosure of associates and joint ventures [Line Items]
Percentage of ownership			20.00%

Investments in Equity Account_5

Investments in Equity Accounted Investees - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of associates and joint ventures [Line Items]
Dividends received from a joint venture and equity method investees	₩ 5,272	₩ 8,639	₩ 59,820
INVENIA Co., Ltd. (LIG INVENIA Co., Ltd.) [member]
Disclosure of associates and joint ventures [Line Items]
Market value for Controlling Company's investments	8,850
WooRee E&L Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Market value for Controlling Company's investments	4,746
YAS Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Market value for Controlling Company's investments	31,200
AVATEC Co., Ltd. [member]
Disclosure of associates and joint ventures [Line Items]
Market value for Controlling Company's investments	₩ 14,151

Investments in Equity Account_6

Investments in Equity Accounted Investees - Summary of Financial Information of Significant Associate (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of associates [Line Items]
Total assets	₩ 33,175,710	₩ 29,159,687
Current assets	8,800,127	10,473,703
Non-current assets	24,375,583	18,685,984
Total liabilities	18,289,464	14,178,177
Current liabilities	9,954,483	8,978,682
Non-current liabilities	8,334,981	5,199,495
Revenue	24,336,571	27,790,216	₩ 26,504,074
Profit for the year	(179,443)	1,937,052	931,508
Other comprehensive income (loss)	(15,409)	(237,393)	21,975
Total comprehensive income	(194,852)	1,699,659	953,483
Paju Electric Glass Co., Ltd. [member]
Disclosure of associates [Line Items]
Total assets	194,021	193,584
Current assets	128,788	146,702
Non-current assets	65,233	46,882
Total liabilities	72,686	77,174
Current liabilities	66,797	71,973
Non-current liabilities	5,889	5,201
Revenue	384,144	408,846	549,559
Profit for the year	12,744	12,327	21,082
Other comprehensive income (loss)	2,612	(9,366)	16,477
Total comprehensive income	₩ 15,356	₩ 2,961	₩ 37,559

Investments in Equity Account_7

Investments in Equity Accounted Investees - Reconciliation from Financial Information of Significant Associate to its Carrying Value in Consolidated Financial Statements (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of associates [Line Items]
Book value	₩ 113,989	₩ 122,507	₩ 172,683
Paju Electric Glass Co., Ltd. [member]
Disclosure of associates [Line Items]
Net asset	₩ 121,335	₩ 116,410
Ownership interest	40.00%	40.00%
Net asset (applying ownership interest)	₩ 48,534	₩ 46,564
Goodwill	0	0
Intra-group transaction	(711)	(53)
Book value	₩ 47,823	₩ 46,511	₩ 52,750

Investments in Equity Account_8

Investments in Equity Accounted Investees - Summary of Financial Information of Other Associates, in Aggregate (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of associates [Line Items]
Book value	₩ 113,989	₩ 122,507	₩ 172,683
Profit (loss) for the year	(179,443)	1,937,052	931,508
Other comprehensive income (loss)	(15,409)	(237,393)	21,975
Total comprehensive income (loss)	(194,852)	1,699,659	953,483
Other associates [member]
Disclosure of associates [Line Items]
Book value	66,166	75,996	₩ 119,933
Profit (loss) for the year	(3,739)	3,943
Other comprehensive income (loss)	(988)	5,093
Total comprehensive income (loss)	₩ (4,727)	₩ 9,036

Investments in Equity Account_9

Investments in Equity Accounted Investees - Changes in Investments in Associates and a Joint Venture Accounted for Using The Equity Method (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of associates [Line Items]
Beginning balance	₩ 122,507	₩ 172,683
Acquisition/Disposal	12,592	(48,209)
Dividends received	(5,272)	(8,639)	₩ (59,820)
Equity income (loss) on investments	700	9,560	8,339
Other comprehensive income (loss)	57	1,346	(5,216)
Other gain (loss)	(16,595)	(4,234)
Ending balance	113,989	122,507	172,683
Paju Electric Glass Co., Ltd. [member]
Disclosure of associates [Line Items]
Beginning balance	46,511	52,750
Dividends received	(4,172)	(8,109)
Equity income (loss) on investments	4,439	5,617
Other comprehensive income (loss)	1,045	(3,747)
Ending balance	47,823	46,511	52,750
Other associates [member]
Disclosure of associates [Line Items]
Beginning balance	75,996	119,933
Acquisition/Disposal	12,592	(48,209)
Dividends received	(1,100)	(530)
Equity income (loss) on investments	(3,739)	3,943
Other comprehensive income (loss)	(988)	5,093
Other gain (loss)	(16,595)	(4,234)
Ending balance	₩ 66,166	₩ 75,996	₩ 119,933

Property, Plant and Equipment -

Property, Plant and Equipment - Changes in Property, Plant and Equipment (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	₩ 16,201,960	₩ 12,031,449
Additions	8,605,551	7,272,476
Depreciation	(3,123,659)	(2,791,883)
Disposals	(116,210)	(86,708)
Impairment loss	(43,601)		₩ (1,610)
Others	107,450
Effect of movements in exchange rates	40,010	(221,515)
Government grants received	(1,210)	(1,859)
Reclassification to assets held-for-sale	(70,161)
Ending balance	21,600,130	16,201,960	12,031,449
Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	52,851,330	48,178,391
Ending balance	60,518,509	52,851,330	48,178,391
Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	(36,645,323)	(36,143,001)
Ending balance	(38,870,782)	(36,645,323)	(36,143,001)
Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	(4,047)	(3,941)
Ending balance	(47,597)	(4,047)	(3,941)
Land [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	460,511	461,484
Disposals	(15)	(1,042)
Others	1,332	69
Ending balance	461,828	460,511	461,484
Land [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	460,511	461,484
Ending balance	461,828	460,511	461,484
Buildings and structures [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	3,858,779	3,885,160
Depreciation	(318,311)	(295,045)
Disposals	(161)	(7,206)
Others	55,430	339,640
Effect of movements in exchange rates	9,809	(63,222)
Government grants received		(548)
Reclassification to assets held-for-sale	(69,758)
Ending balance	3,535,788	3,858,779	3,885,160
Buildings and structures [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	6,539,506	6,284,778
Ending balance	6,528,939	6,539,506	6,284,778
Buildings and structures [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	(2,678,970)	(2,397,967)
Ending balance	(2,991,445)	(2,678,970)	(2,397,967)
Buildings and structures [member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	(1,757)	(1,651)
Ending balance	(1,706)	(1,757)	(1,651)
Machinery And Equipment1 [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	5,712,750	4,522,528
Depreciation	(2,568,335)	(2,416,202)
Disposals	(112,752)	(75,275)
Impairment loss	(25,711)
Others	1,959,645	3,825,155
Effect of movements in exchange rates	14,520	(140,306)
Government grants received	(1,029)	(3,150)
Reclassification to assets held-for-sale	(1)
Ending balance	4,979,087	5,712,750	4,522,528
Machinery And Equipment1 [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	38,901,158	37,472,177
Ending balance	39,825,070	38,901,158	37,472,177
Machinery And Equipment1 [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	(33,186,118)	(32,947,359)
Ending balance	(34,817,982)	(33,186,118)	(32,947,359)
Machinery And Equipment1 [member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	(2,290)	(2,290)
Ending balance	(28,001)	(2,290)	(2,290)
Furniture and fixtures [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	141,342	124,258
Depreciation	(67,274)	(66,963)
Disposals	(311)	(52)
Others	68,177	87,186
Effect of movements in exchange rates	359	(3,087)
Reclassification to assets held-for-sale	(37)
Ending balance	142,256	141,342	124,258
Furniture and fixtures [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	772,824	775,682
Ending balance	834,628	772,824	775,682
Furniture and fixtures [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	(631,482)	(651,424)
Ending balance	(692,372)	(631,482)	(651,424)
Construction-in-progress [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	5,971,856	2,981,964
Additions	8,605,551	7,272,476
Impairment loss	(17,890)
Others	(2,357,412)	(4,270,210)
Effect of movements in exchange rates	15,010	(14,213)
Government grants received	(181)	1,839
Ending balance	12,216,934	5,971,856	2,981,964
Construction-in-progress [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	5,971,856	2,981,964
Ending balance	12,234,824	5,971,856	2,981,964
Construction-in-progress [member] | Accumulated impairment [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Ending balance	(17,890)
Others [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	56,722	56,055
Depreciation	(169,739)	(13,673)
Disposals	(2,971)	(3,133)
Others	380,278	18,160
Effect of movements in exchange rates	312	(687)
Reclassification to assets held-for-sale	(365)
Ending balance	264,237	56,722	56,055
Others [member] | Gross carrying amount [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	205,475	202,306
Ending balance	633,220	205,475	202,306
Others [member] | Accumulated depreciation and amortisation [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Beginning balance	(148,753)	(146,251)
Ending balance	₩ (368,893)	₩ (148,753)	₩ (146,251)

Property, Plant and Equipment_2

Property, Plant and Equipment - Capitalized Borrowing Costs and Capitalization Rate (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Borrowing costs [abstract]
Capitalized borrowing costs	₩ 146,607	₩ 47,686	₩ 16,909
Capitalization rate	2.80%	1.92%	2.91%

Intangible Assets - Changes in

Intangible Assets - Changes in Intangible Assets (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	₩ 912,821	₩ 894,937
Amortization	(430,906)	(422,693)
Disposals	(721)	(1,396)
Impairment loss	(82)	(1,809)	₩ (138)
Reversal of impairment loss	348	35
Transfer from construction-in-progress	449	(3,218)
Effect of movements in exchange rates	4,638	(25,568)
Ending balance	987,642	912,821	894,937
Internally developed [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Additions	372,835	336,207
External purchases [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Additions	128,260	136,326
Gross carrying amount [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	3,836,290	3,408,991
Ending balance	4,344,102	3,836,290	3,408,991
Accumulated depreciation and amortisation [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	(2,911,684)	(2,504,043)
Ending balance	(3,344,939)	(2,911,684)	(2,504,043)
Accumulated impairment [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	(11,785)	(10,011)
Ending balance	(11,521)	(11,785)	(10,011)
Intellectual property rights [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	246,966	286,266
Amortization	(43,437)	(42,195)
Disposals		(4)
Effect of movements in exchange rates	1,896	(19,847)
Ending balance	230,021	246,966	286,266
Intellectual property rights [member] | External purchases [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Additions	24,596	22,746
Intellectual property rights [member] | Gross carrying amount [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	895,721	904,664
Ending balance	926,969	895,721	904,664
Intellectual property rights [member] | Accumulated depreciation and amortisation [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	(648,755)	(618,398)
Ending balance	(696,948)	(648,755)	(618,398)
Software [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	161,490	145,772
Amortization	(80,159)	(78,939)
Transfer from construction-in-progress	95,028	98,989
Effect of movements in exchange rates	1,240	(4,332)
Ending balance	177,599	161,490	145,772
Software [member] | Gross carrying amount [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	898,278	806,835
Ending balance	992,139	898,278	806,835
Software [member] | Accumulated depreciation and amortisation [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	(736,788)	(661,063)
Ending balance	(814,540)	(736,788)	(661,063)
Memberships [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	43,200	41,553
Disposals	(721)	(1,392)
Impairment loss	(82)	(1,809)
Reversal of impairment loss	348	35
Transfer from construction-in-progress	449
Effect of movements in exchange rates	1	(6)
Ending balance	46,039	43,200	41,553
Memberships [member] | External purchases [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Additions	2,844	4,819
Memberships [member] | Gross carrying amount [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	54,985	51,564
Ending balance	57,560	54,985	51,564
Memberships [member] | Accumulated impairment [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	(11,785)	(10,011)
Ending balance	(11,521)	(11,785)	(10,011)
Development costs [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	296,760	256,340
Amortization	(302,685)	(295,787)
Ending balance	366,910	296,760	256,340
Development costs [member] | Internally developed [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Additions	372,835	336,207
Development costs [member] | Gross carrying amount [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	1,769,998	1,433,791
Ending balance	2,142,832	1,769,998	1,433,791
Development costs [member] | Accumulated depreciation and amortisation [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	(1,473,238)	(1,177,451)
Ending balance	(1,775,922)	(1,473,238)	(1,177,451)
Construction-in-progress (software) [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	30,933	18,738
Transfer from construction-in-progress	(95,028)	(98,989)
Effect of movements in exchange rates	238	2,423
Ending balance	36,963	30,933	18,738
Construction-in-progress (software) [member] | External purchases [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Additions	100,820	108,761
Construction-in-progress (software) [member] | Gross carrying amount [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	30,933	18,738
Ending balance	36,963	30,933	18,738
Customer relationships [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	27,839	32,498
Amortization	(3,517)	(4,659)
Ending balance	24,322	27,839	32,498
Customer relationships [member] | Gross carrying amount [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	59,176	59,176
Ending balance	59,176	59,176	59,176
Customer relationships [member] | Accumulated depreciation and amortisation [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	(31,337)	(26,678)
Ending balance	(34,854)	(31,337)	(26,678)
Technology [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	2,584	3,692
Amortization	(1,107)	(1,108)
Ending balance	1,477	2,584	3,692
Technology [member] | Gross carrying amount [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	11,074	11,074
Ending balance	11,075	11,074	11,074
Technology [member] | Accumulated depreciation and amortisation [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	(8,490)	(7,382)
Ending balance	(9,598)	(8,490)	(7,382)
Goodwill [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	103,048	110,072
Transfer from construction-in-progress		(3,218)
Effect of movements in exchange rates	1,263	(3,806)
Ending balance	104,311	103,048	110,072
Goodwill [member] | Gross carrying amount [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	103,048	110,072
Ending balance	104,311	103,048	110,072
Others [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	1	6
Amortization	(1)	(5)
Ending balance		1	6
Others [member] | Gross carrying amount [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	13,077	13,077
Ending balance	13,077	13,077	13,077
Others [member] | Accumulated depreciation and amortisation [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Beginning balance	(13,076)	(13,071)
Ending balance	₩ (13,077)	₩ (13,076)	₩ (13,071)

Intangible Assets - Changes i_2

Intangible Assets - Changes in Intangible Assets (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Decrease in goodwill	₩ (449)	₩ 3,218
Goodwill [member]
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items]
Decrease in goodwill		₩ 3,218

Intangible Assets - Summary of

Intangible Assets - Summary of Development Costs (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of development costs of intangible assets [line items]
Development completed	₩ 150,401	₩ 142,165
Development in process	216,509	154,595
Development costs	366,910	296,760
Mobile [member]
Disclosure of development costs of intangible assets [line items]
Development completed	108,467	79,372
Development in process	₩ 144,679	₩ 117,222
Remaining Useful life	0.5	0.6
Televisions [member]
Disclosure of development costs of intangible assets [line items]
Development completed	₩ 28,001	₩ 36,038
Development in process	₩ 55,580	₩ 30,670
Remaining Useful life	0.5	0.6
Notebook [member]
Disclosure of development costs of intangible assets [line items]
Development completed	₩ 4,458	₩ 14,311
Development in process	₩ 9,639	₩ 2,356
Remaining Useful life	0.6	0.5
Other Products [member]
Disclosure of development costs of intangible assets [line items]
Development completed	₩ 9,475	₩ 12,444
Development in process	₩ 6,611	₩ 4,347
Remaining Useful life	0.5	0.4

Financial Liabilities - Summary

Financial Liabilities - Summary of Financial Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current
Current portion of long-term borrowings and bonds	₩ 1,553,907	₩ 1,452,926
Current financial liabilities	1,553,907	1,452,926
Non-current
Bonds	1,772,599	1,506,003
Derivatives	25,758
Non-current financial liabilities	7,030,628	4,150,192
Won [member]
Current
Current portion of long-term borrowings and bonds	150,651	200,664
Non-current
Non-current financial liabilities	2,700,608	1,251,258
Bonds	1,446,393	1,506,003
Foreign currencies [member]
Non-current
Non-current financial liabilities	2,531,663	₩ 1,392,931
Bonds	₩ 326,206

Financial Liabilities - Summa_2

Financial Liabilities - Summary of Long-term Borrowings (Detail) ₩ in Millions, ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)	Dec. 31, 2018CNY (¥)	Dec. 31, 2018USD ($)	Dec. 31, 2017KRW (₩)	Dec. 31, 2017CNY (¥)	Dec. 31, 2017USD ($)
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings	₩ 8,558,777			₩ 5,603,118
Less current portion of long-term borrowings	(1,553,907)			(1,452,926)
Foreign currencies [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings		¥ 5,198	$ 2,262		¥ 3,263	$ 1,500
Less current portion of long-term borrowings	(843,598)			(747,503)
Noncurrent portion of long-term borrowings	2,531,663			1,392,931
Foreign currencies [member] | The Export-Import Bank of Korea [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings	₩ 955,975			755,337
Long-term borrowings, annual interest rate description	3ML+0.75~1.70
Foreign currencies [member] | China Construction Bank [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings	₩ 2,419,286			1,385,097
Long-term borrowings, annual interest rate description	USD: 3ML+0.80~2.00 CNY: PBOC*(0.90~1.05)
Won [member]
Disclosure of detailed information about borrowings [Line Items]
Noncurrent portion of long-term borrowings	₩ 2,700,608			1,251,258
Less current portion of long-term borrowings	(150,651)			(200,664)
Won [member] | Woori bank [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings	₩ 1,259			1,922
Long-term borrowings, annual interest rate description	3-yearKorean Treasury Bond rate - 2.75
Won [member] | Shinhan bank [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings				200,000
Long-term borrowings, annual interest rate description	-
Won [member] | Korea development bank and others [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings	₩ 2,850,000			₩ 1,250,000
Long-term borrowings, annual interest rate description	CD rate (91days) + 0.64, 2.43~3.25

Financial Liabilities - Summa_3

Financial Liabilities - Summary of Long-term Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018
Woori bank [member] | Won [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings, maturity period	3 Years
Long-term borrowings, annual interest rate	2.75%
Korea development bank and others [member] | Won [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings, maturity period	91 days
Long-term borrowings, annual interest rate adjustment	0.64%
Korea development bank and others [member] | Won [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings, annual interest rate adjustment	2.43%
Korea development bank and others [member] | Won [member] | Top of range [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings, annual interest rate adjustment	3.25%
The Export-Import Bank of Korea [member] | Foreign currencies [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings, annual interest rate adjustment	0.75%
The Export-Import Bank of Korea [member] | Foreign currencies [member] | Top of range [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings, annual interest rate adjustment	1.70%
China Construction Bank [member] | Foreign currencies [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings, annual interest rate adjustment	0.80%
Long-term borrowings, annual interest rate	0.90%
China Construction Bank [member] | Foreign currencies [member] | Top of range [member]
Disclosure of detailed information about borrowings [Line Items]
Long-term borrowings, annual interest rate adjustment	2.00%
Long-term borrowings, annual interest rate	1.05%

Financial Liabilities - Details

Financial Liabilities - Details of Bonds Issued and Outstanding (Detail) ₩ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)	Dec. 31, 2018USD ($)	Dec. 31, 2017KRW (₩)
Disclosure of detailed information about borrowings [Line Items]
Bonds	₩ 2,332,257		₩ 2,010,762
Bonds	2,332,257		2,010,762
Bonds	1,772,599		1,506,003
Won [member]
Disclosure of detailed information about borrowings [Line Items]
Less current portion	(559,658)		(504,759)
Bonds	1,446,393		1,506,003
Foreign currencies [member]
Disclosure of detailed information about borrowings [Line Items]
Bonds	326,206
Gross carrying amount [member] | Won [member] | Publicly issued bonds [Member]
Disclosure of detailed information about borrowings [Line Items]
Bonds	1,900,000		2,015,000
Bonds	1,900,000		2,015,000
Gross carrying amount [member] | Won [member] | Privately issued bonds [member]
Disclosure of detailed information about borrowings [Line Items]
Bonds	110,000
Bonds	110,000
Gross carrying amount [member] | Foreign currencies [member] | Publicly issued bonds [Member]
Disclosure of detailed information about borrowings [Line Items]
Bonds	335,430	$ 300
Bonds	335,430	$ 300
Discount on bonds [member] | Won [member]
Disclosure of detailed information about borrowings [Line Items]
Bonds	(3,949)		(4,238)
Bonds	(3,949)		₩ (4,238)
Discount on bonds [member] | Foreign currencies [member]
Disclosure of detailed information about borrowings [Line Items]
Bonds	(9,224)
Bonds	₩ (9,224)
Bonds issued and outstanding [member] | Gross carrying amount [member] | Foreign currencies [member] | Publicly issued bonds [Member]
Disclosure of detailed information about borrowings [Line Items]
Bonds issued and outstanding, maturity period	November 2021
Bonds issued and outstanding, annual interest rate	3.88%	3.88%
Bonds issued and outstanding [member] | Bottom of range [member] | Gross carrying amount [member] | Won [member] | Publicly issued bonds [Member]
Disclosure of detailed information about borrowings [Line Items]
Bonds issued and outstanding, maturity period	April 2019
Bonds issued and outstanding, annual interest rate	1.80%	1.80%
Bonds issued and outstanding [member] | Bottom of range [member] | Gross carrying amount [member] | Won [member] | Privately issued bonds [member]
Disclosure of detailed information about borrowings [Line Items]
Bonds issued and outstanding, maturity period	May 2025
Bonds issued and outstanding, annual interest rate	3.25%	3.25%
Bonds issued and outstanding [member] | Top of range [member] | Gross carrying amount [member] | Won [member] | Publicly issued bonds [Member]
Disclosure of detailed information about borrowings [Line Items]
Bonds issued and outstanding, maturity period	February 2023
Bonds issued and outstanding, annual interest rate	3.45%	3.45%
Bonds issued and outstanding [member] | Top of range [member] | Gross carrying amount [member] | Won [member] | Privately issued bonds [member]
Disclosure of detailed information about borrowings [Line Items]
Bonds issued and outstanding, maturity period	May 2033
Bonds issued and outstanding, annual interest rate	4.25%	4.25%

Employee Benefits - Net Defined

Employee Benefits - Net Defined Benefit Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [abstract]
Present value of partially funded defined benefit obligations	₩ 1,595,423	₩ 1,562,424
Fair value of plan assets	(1,550,063)	(1,466,977)
Defined benefit liabilities, net	₩ 45,360	₩ 95,447

Employee Benefits - Changes in

Employee Benefits - Changes in Present Value of Defined Benefit Obligations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [Line Items]
Current service cost	₩ 204,668	₩ 195,850	₩ 210,682
Past service cost	(25,749)
Interest cost	961	2,391	10,280
Defined benefit obligations [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Opening defined benefit obligations	1,562,424	1,401,396
Current service cost	204,668	195,850
Past service cost	(25,749)
Interest cost	49,145	40,844
Remeasurements (before tax)	(27,885)	(114)
Benefit payments	(88,562)	(76,011)
Transfers from (to) related parties	(4,217)	534
Curtailment of plans	(74,459)
Others	58	(75)
Closing defined benefit obligations	₩ 1,595,423	₩ 1,562,424	₩ 1,401,396

Employee Benefits - Additional

Employee Benefits - Additional Information (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)yr	Dec. 31, 2017yr
Disclosure of defined benefit plans [abstract]
Weighted average remaining maturity of defined benefit obligations | yr	14.4	14
Estimated contribution expected to be paid, December 31, 2019 | ₩	₩ 63,688

Employee Benefits - Changes i_2

Employee Benefits - Changes in Fair Value of Plan Assets (Detail) - Fair value of plan assets [member] - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	₩ 1,466,977	₩ 1,258,409
Expected return on plan assets	48,184	38,453
Remeasurements (before tax)	(22,195)	(16,374)
Contributions by employer directly to plan assets	212,224	250,998
Benefit payments	(80,690)	(64,509)
Curtailment of plans	(74,437)
Ending balance	₩ 1,550,063	₩ 1,466,977

Employee Benefits - Details of

Employee Benefits - Details of Plan Assets (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value of plan assets [abstract]
Guaranteed deposits in banks	₩ 1,550,063	₩ 1,466,977

Employee Benefits - Expenses Re

Employee Benefits - Expenses Recognized in Profit or Loss and Line Items Included in Consolidated Statements of Comprehensive Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [Line Items]
Current service cost	₩ 204,668	₩ 195,850	₩ 210,682
Past service cost	(25,749)
Net interest cost	961	2,391	10,280
Expenses related to defined benefit plans	179,880	198,241	220,962
Cost of sales [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Expenses related to defined benefit plans	134,879	158,418	177,652
Selling expenses [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Expenses related to defined benefit plans	11,045	11,114	12,513
Administrative expenses [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Expenses related to defined benefit plans	19,472	16,287	16,486
Research and development expenses [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Expenses related to defined benefit plans	₩ 14,484	₩ 12,422	₩ 14,311

Employee Benefits - Remeasureme

Employee Benefits - Remeasurements of Net Defined Benefit Liabilities (Assets) Included in Other Comprehensive Income (Loss) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of net defined benefit liability (asset) [Line Items]
Share of associates regarding remeasurements	₩ 20	₩ 441	₩ 200
Income tax	(1,169)	9,259	(37,594)
Remeasurements of net defined benefit liabilities (assets) [member]
Disclosure of net defined benefit liability (asset) [Line Items]
Beginning balance	(170,510)	(163,950)	(281,902)
Actuarial profit or loss arising from: Experience adjustment	56,225	(48,890)	70,258
Actuarial profit or loss arising from: Demographic assumptions	(15,379)	(7,702)	(4,605)
Actuarial profit or loss arising from: Financial assumptions	(12,961)	56,706	95,429
Return on plan assets	(22,195)	(16,374)	(5,736)
Share of associates regarding remeasurements	20	441	200
Remeasurements	5,710	(15,819)	155,546
Income tax	(1,169)	9,259	(37,594)
Ending balance	₩ (165,969)	₩ (170,510)	₩ (163,950)

Employee Benefits - Principal A

Employee Benefits - Principal Actuarial Assumptions (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Expected rate of salary increase	4.30%	4.70%
Discount rate for defined benefit obligations	2.80%	3.20%
Males [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Actuarial assumption of expected rates of mortality at teenage	0.01%	0.01%
Actuarial assumption of expected rates of mortality at twenties	0.01%	0.01%
Actuarial assumption of expected rates of mortality at thirties	0.01%	0.01%
Actuarial assumption of expected rates of mortality at forties	0.03%	0.03%
Actuarial assumption of expected rates of mortality at fifties	0.05%	0.05%
Females [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Actuarial assumption of expected rates of mortality at teenage	0.00%	0.00%
Actuarial assumption of expected rates of mortality at twenties	0.00%	0.00%
Actuarial assumption of expected rates of mortality at thirties	0.01%	0.01%
Actuarial assumption of expected rates of mortality at forties	0.02%	0.02%
Actuarial assumption of expected rates of mortality at fifties	0.02%	0.02%

Employee Benefits - Amounts of

Employee Benefits - Amounts of Defined Benefit Obligations Affected by Reasonably Possible Changes to Respective Relevant Actuarial Assumptions (Detail) ₩ in Millions	Dec. 31, 2018KRW (₩)
Discount rate for defined benefit obligations [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Defined benefit obligation 1% increase	₩ (199,750)
Defined benefit obligation 1% decrease	241,608
Expected rate of salary increase [member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Defined benefit obligation 1% increase	236,002
Defined benefit obligation 1% decrease	₩ (199,363)

Provisions - Changes in Provisi

Provisions - Changes in Provisions (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of other provisions [Line Items]
Beginning balance	₩ 104,328	₩ 64,127
Adjustment from adoption of IFRS 15	9,789
Additions (reversals)	232,234	251,344
Usage and reclassification	(215,333)	(211,143)
Ending balance	131,018	104,328
Current	98,254	76,016
Non-current	32,764	28,312
Litigations and claims [member]
Disclosure of other provisions [Line Items]
Beginning balance	43
Additions (reversals)		43
Usage and reclassification	(43)
Ending balance		43
Current		43
Warranties [member]
Disclosure of other provisions [Line Items]
Beginning balance	102,450	62,462
Additions (reversals)	234,928	251,131
Usage and reclassification	(215,290)	(211,143)
Ending balance	122,088	102,450
Current	89,324	74,138
Non-current	32,764	28,312
Others [member]
Disclosure of other provisions [Line Items]
Beginning balance	1,835	1,665
Adjustment from adoption of IFRS 15	9,789
Additions (reversals)	(2,694)	170
Ending balance	8,930	1,835
Current	₩ 8,930	₩ 1,835

Provisions - Changes in Provi_2

Provisions - Changes in Provisions (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018
Disclosure of other provisions [abstract]
Applicable period from the date of purchase for warranties covering defective products	18 months

Other Liabilities - Summary of

Other Liabilities - Summary of Other Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current liabilities
Withholdings	₩ 30,970	₩ 63,766
Unearned revenues	43,841	12,225
Security deposits	165
Other current liabilities	74,976	75,991
Non-current liabilities
Long-term accrued expenses	80,817	70,561
Long-term other accounts payable	3,103	2
Long-term unearned revenue	2,116
Security deposits	10,790
Other non-current liabilities	₩ 96,826	₩ 70,563

Contingent Liabilities and Co_3

Contingent Liabilities and Commitments - Additional Information (Detail) € in Millions, ₫ in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, zł in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)	Dec. 31, 2018USD ($)	Dec. 31, 2018CNY (¥)	Dec. 31, 2018USD ($)	Dec. 31, 2018EUR (€)	Dec. 31, 2018JPY (¥)	Dec. 31, 2018PLN (zł)	Dec. 31, 2018VND (₫)	Dec. 31, 2017KRW (₩)
Disclosure of contingent liabilities [Line Items]
Maximum aggregate accounts receivable sales negotiating facilities entered into with several banks	₩ 1,867,227			$ 1,670
Long-term advances	1,114,316								₩ 830,335
Secured bank borrowing	268,093								₩ 642,172
Long-term supply agreements [member]
Disclosure of contingent liabilities [Line Items]
Long-term advances	1,649,198			1,475
KEB Hana Bank [member]
Disclosure of contingent liabilities [Line Items]
Payment guarantees obtained from banks for certain tax payments and settlement of litigation	1,719,079			1,538
KEB Hana Bank [member] | Top of range [member]
Disclosure of contingent liabilities [Line Items]
Undrawn borrowing facilities	33,543			30
Bank of China [member] | Top of range [member]
Disclosure of contingent liabilities [Line Items]
Undrawn borrowing facilities	89,448			80
Bank of China [member] | LG Display (China) Co., Ltd. [member] | CNY [member]
Disclosure of contingent liabilities [Line Items]
Payment guarantees obtained from banks for certain tax payments and settlement of litigation	278,401		¥ 1,711
Bank of China [member] | LG Display (China) Co., Ltd. [member] | JPY [member]
Disclosure of contingent liabilities [Line Items]
Payment guarantees obtained from banks for certain tax payments and settlement of litigation	9,119					¥ 900
Bank of China [member] | LG Display (China) Co., Ltd. [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Payment guarantees obtained from banks for certain tax payments and settlement of litigation	559			0.5
Bank of China [member] | LG Display (China) Co., Ltd. [member] | EUR [member]
Disclosure of contingent liabilities [Line Items]
Payment guarantees obtained from banks for certain tax payments and settlement of litigation	3,198				€ 2.5
Bank of China [member] | LG Display (China) Co., Ltd. [member] | PLN [member]
Disclosure of contingent liabilities [Line Items]
Payment guarantees obtained from banks for certain tax payments and settlement of litigation	30						zł 0.1
Bank of China [member] | LG Display (China) Co., Ltd. [member] | VND [member]
Disclosure of contingent liabilities [Line Items]
Payment guarantees obtained from banks for certain tax payments and settlement of litigation	1,952							₫ 40,498
Sumitomo Mitsui Banking Corporation [member] | Top of range [member]
Disclosure of contingent liabilities [Line Items]
Undrawn borrowing facilities	55,905			50
Shinhan bank [member]
Disclosure of contingent liabilities [Line Items]
Payment guarantees obtained from banks for certain tax payments and settlement of litigation	9,504			8.5
Korea Development Bank [member]
Disclosure of contingent liabilities [Line Items]
Payment guarantees obtained from banks for certain tax payments and settlement of litigation	341,929			306
KEB Hana Bank and Other Various Banks [member]
Disclosure of contingent liabilities [Line Items]
Payment guarantees received	1,719,079	$ 1,538
China Construction Bank [member]
Disclosure of contingent liabilities [Line Items]
Property, plant and equipment and others provided as pledged assets for secured bank loans	146,262
China Construction Bank [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Secured bank borrowing	₩ 268,093			$ 240

Contingent Liabilities and Co_4

Contingent Liabilities and Commitments - Maximum Amount of Accounts Receivables Sales and Amount of Sold Accounts Receivables before Maturity by Contract (Detail) - Dec. 31, 2018 ₩ in Millions, $ in Millions	KRW (₩)	USD ($)
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	₩ 2,994,007
Not yet due contractual amount of sold accounts receivables before maturity	1,532,470
Won [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	220,000
Not yet due contractual amount of sold accounts receivables before maturity	36,089
USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales | $		$ 2,481
Not yet due contractual amount of sold accounts receivables before maturity | $		1,338
Parent [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	706,374
Not yet due contractual amount of sold accounts receivables before maturity	143,075
Parent [member] | Won [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	220,000
Not yet due contractual amount of sold accounts receivables before maturity	36,089
Parent [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales | $		435
Not yet due contractual amount of sold accounts receivables before maturity | $		95
Parent [member] | Shinhan bank [member] | Won [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	90,000
Parent [member] | Shinhan bank [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	27,953	25
Not yet due contractual amount of sold accounts receivables before maturity	13,286	12
Parent [member] | Sumitomo Mitsui Banking Corporation [member] | Won [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	130,000
Not yet due contractual amount of sold accounts receivables before maturity	36,089
Parent [member] | Sumitomo Mitsui Banking Corporation [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	22,362	20
Parent [member] | Bank of Tokyo-Mitsubishi UFJ [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	44,724	40
Not yet due contractual amount of sold accounts receivables before maturity	44,516	40
Parent [member] | BNP Paribas [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	223,620	200
Not yet due contractual amount of sold accounts receivables before maturity	13,630	12
Parent [member] | ING Bank [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	167,715	150
Not yet due contractual amount of sold accounts receivables before maturity	35,554	31
Consolidated subsidiaries [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	2,287,633	2,046
Not yet due contractual amount of sold accounts receivables before maturity	1,389,395	1,243
Consolidated subsidiaries [member] | LG Display Singapore Pte. Ltd. [member] | Standard Chartered Bank [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	335,430	300
Not yet due contractual amount of sold accounts receivables before maturity	233,364	209
Consolidated subsidiaries [member] | LG Display Taiwan Co., Ltd. [member] | BNP Paribas [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	58,141	52
Not yet due contractual amount of sold accounts receivables before maturity	10,063	9
Consolidated subsidiaries [member] | LG Display Taiwan Co., Ltd. [member] | Austrailia and New Zealand Banking Group Ltd [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	78,267	70
Not yet due contractual amount of sold accounts receivables before maturity	58,142	52
Consolidated subsidiaries [member] | LG Display Taiwan Co., Ltd. [member] | Taishin International Bank [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	323,131	289
Not yet due contractual amount of sold accounts receivables before maturity	96,157	86
Consolidated subsidiaries [member] | LG Display Germany GmbH [member] | BNP Paribas [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	83,858	75
Not yet due contractual amount of sold accounts receivables before maturity	83,767	75
Consolidated subsidiaries [member] | LG Display Germany GmbH [member] | Citibank [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	178,896	160
Consolidated subsidiaries [member] | LG Display America, Inc. [member] | Sumitomo Mitsui Banking Corporation [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	89,448	80
Not yet due contractual amount of sold accounts receivables before maturity	74,915	67
Consolidated subsidiaries [member] | LG Display America, Inc. [member] | Standard Chartered Bank [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	670,860	600
Not yet due contractual amount of sold accounts receivables before maturity	575,823	515
Consolidated subsidiaries [member] | LG Display America, Inc. [member] | Hongkong & Shanghai Banking Corp. [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	447,240	400
Not yet due contractual amount of sold accounts receivables before maturity	257,164	230
Consolidated subsidiaries [member] | LG Display Japan Co., Ltd. [member] | Sumitomo Mitsui Banking Corporation [member] | USD [member]
Disclosure of contingent liabilities [Line Items]
Maximum contractual amount of accounts receivables sales	₩ 22,362	$ 20

Capital and Reserves - Addition

Capital and Reserves - Additional Information (Detail) - ₩ / shares	Dec. 31, 2018	Dec. 31, 2017
Disclosure of reserves within equity [abstract]
Number of shares authorized	500,000,000	500,000,000
Par value per share	₩ 5,000	₩ 5,000
Number of issued common shares	357,815,700	357,815,700

Capital and Reserves - Summary

Capital and Reserves - Summary of Reserves at Reporting Date (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of reserves within equity [abstract]
Foreign currency translation differences for foreign operations	₩ (272,474)	₩ (259,749)
Other comprehensive loss from associates (excluding remeasurements of net defined benefit liabilities)	(28,494)	(28,531)
Reserves	₩ (300,968)	₩ (288,280)	₩ (88,478)	₩ (5,766)

Capital and Reserves - Movement

Capital and Reserves - Movement in Reserves (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of reserves within equity [Line Items]
Beginning balance	₩ (288,280)	₩ (88,478)	₩ (5,766)
Change in reserves	(12,688)	(199,802)	(82,712)
Ending balance	(300,968)	(288,280)	(88,478)
Net change in fair value of available-for-sale financial assets [member]
Disclosure of reserves within equity [Line Items]
Beginning balance			58
Change in reserves			(58)
Foreign currency translation differences for foreign operations [member]
Disclosure of reserves within equity [Line Items]
Beginning balance	(259,749)	(59,042)	18,196
Change in reserves	(12,725)	(200,707)	(77,238)
Ending balance	(272,474)	(259,749)	(59,042)
Amount recognized in other comprehensive income loss from associates excluding remeasurements [member]
Disclosure of reserves within equity [Line Items]
Beginning balance	(28,531)	(29,436)	(24,020)
Change in reserves	37	905	(5,416)
Ending balance	₩ (28,494)	₩ (28,531)	₩ (29,436)

Geographic and Other Informat_3

Geographic and Other Information - Revenue and Non-current Assets by Geography (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of geographical areas [Line Items]
Revenue	₩ 24,336,571	₩ 27,790,216	₩ 26,504,074
Property, plant and equipment	21,600,130	16,201,960	12,031,449
Intangible assets	987,642	912,821	894,937
Domestic [member]
Disclosure of geographical areas [Line Items]
Revenue	1,589,452	1,996,183	1,825,191
Property, plant and equipment	14,984,688	12,487,111
Intangible assets	816,808	731,373
China [member]
Disclosure of geographical areas [Line Items]
Revenue	15,242,533	18,090,974	18,367,767
Property, plant and equipment	5,049,216	2,929,739
Intangible assets	12,332	17,244
Other countries [member]
Disclosure of geographical areas [Line Items]
Property, plant and equipment	1,566,226	785,110
Intangible assets	158,502	164,204
Foreign countries [member]
Disclosure of geographical areas [Line Items]
Revenue	22,747,119	25,794,033	24,678,883
Property, plant and equipment	6,615,442	3,714,849
Intangible assets	170,834	181,448
Asia (excluding China) [member]
Disclosure of geographical areas [Line Items]
Revenue	2,481,112	2,383,390	2,148,676
United States [member]
Disclosure of geographical areas [Line Items]
Revenue	2,462,918	2,724,714	2,053,317
Europe (excluding Poland) [member]
Disclosure of geographical areas [Line Items]
Revenue	1,496,138	1,433,126	983,672
Poland [member]
Disclosure of geographical areas [Line Items]
Revenue	₩ 1,064,418	₩ 1,161,829	₩ 1,125,451

Geographic and Other Informat_4

Geographic and Other Information - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of geographical areas [Line Items]
Sales revenue	₩ 24,336,571	₩ 27,790,216	₩ 26,504,074
Company A [member]
Disclosure of geographical areas [Line Items]
Sales revenue	7,262,255	9,027,165	9,122,385
Company B [member]
Disclosure of geographical areas [Line Items]
Sales revenue	₩ 5,171,354	₩ 6,511,961	₩ 5,808,630
Top 10 Companies [member]
Disclosure of geographical areas [Line Items]
Percentage of sales revenue	77.00%	81.00%	82.00%

Geographic and Other Informat_5

Geographic and Other Information - Revenue by Product and Services (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of products and services [Line Items]
Revenue	₩ 24,336,571	₩ 27,790,216	₩ 26,504,074
Televisions [member]
Disclosure of products and services [Line Items]
Revenue	9,727,260	11,717,982	10,132,520
Desktop monitors [member]
Disclosure of products and services [Line Items]
Revenue	4,040,025	4,393,482	4,035,195
Tablet products [member]
Disclosure of products and services [Line Items]
Revenue	1,990,766	2,369,634	2,695,808
Notebook computers [member]
Disclosure of products and services [Line Items]
Revenue	2,836,888	2,244,088	2,383,532
Mobile and others [member]
Disclosure of products and services [Line Items]
Revenue	₩ 5,741,632	₩ 7,065,030	₩ 7,257,019

The Nature of Expenses and Ot_3

The Nature of Expenses and Others - Classification of Expenses by Nature (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Expenses by nature [abstract]
Changes in inventories	₩ (341,120)	₩ (62,299)	₩ 63,884
Purchases of raw materials, merchandise and others	12,863,812	13,548,848	14,244,942
Depreciation and amortization	3,554,565	3,214,576	3,021,571
Outsourcing fees	825,393	771,697	819,742
Labor costs	3,222,110	3,258,427	3,022,607
Supplies and others	1,010,352	1,239,915	1,053,245
Utility	899,075	865,347	840,664
Fees and commissions	722,134	692,125	638,732
Shipping costs	240,288	249,820	224,742
Advertising	112,400	236,440	67,636
Warranty expenses	234,928	251,131	166,691
Travel	104,009	92,976	73,807
Taxes and dues	123,210	91,806	74,506
Others	757,673	919,051	927,218
Expenses by nature	₩ 24,328,829	₩ 25,369,860	₩ 25,239,987

Selling and Administrative Ex_3

Selling and Administrative Expenses - Details of Selling and Administrative Expenses (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of comprehensive income [Line Items]
Expenses related to defined benefit plans	₩ 179,880	₩ 198,241	₩ 220,962
Shipping costs	240,288	249,820	224,742
Fees and commissions	722,134	692,125	638,732
Taxes and dues	123,210	91,806	74,506
Advertising	112,400	236,440	67,636
Warranty expenses	234,928	251,131	166,691
Travel	104,009	92,976	73,807
Others	757,673	919,051	927,218
Selling, general and administrative expenses	1,772,276	1,690,505	1,305,393
Selling general and administrative expenses [member]
Statement of comprehensive income [Line Items]
Salaries	500,610	327,288	276,824
Expenses related to defined benefit plans	30,724	27,401	28,999
Other employee benefits	90,348	94,740	89,717
Shipping costs	200,434	214,866	191,442
Fees and commissions	221,050	197,070	192,786
Depreciation	174,575	138,711	129,225
Taxes and dues	65,621	46,317	30,523
Advertising	112,400	236,440	67,636
Warranty expenses	234,928	251,131	166,691
Rent	26,691	26,711	25,840
Insurance	11,584	12,459	11,561
Travel	24,659	27,879	23,343
Training	13,309	16,311	14,464
Others	₩ 65,343	₩ 73,181	₩ 56,342

Selling and Administrative Ex_4

Selling and Administrative Expenses - Details of Selling and Administrative Expenses (Parenthetical) (Detail) - Selling general and administrative expenses [member] ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)
Statement of comprehensive income [Line Items]
Expense related to retirement allowance	₩ 184,941
Expense related to the define contribution plan	₩ 111

Personnel Expenses - Disclosure

Personnel Expenses - Disclosure of Details of Personnel Expenses (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of comprehensive income [Line Items]
Personnel expenses	₩ 3,476,588	₩ 3,459,223	₩ 3,169,149
Personnel expenses [member]
Statement of comprehensive income [Line Items]
Salaries and wages	2,720,014	2,704,217	2,418,869
Other employee benefits	500,169	483,704	459,730
Contributions to National Pension plan	75,668	73,061	69,588
Expenses related to defined benefit plan and defined contribution plan	₩ 180,737	₩ 198,241	₩ 220,962

Personnel Expenses - Disclosu_2

Personnel Expenses - Disclosure of Details of Personnel Expenses (Parenthetical) (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)
Personnel expenses [member]
Statement of comprehensive income [Line Items]
Expense related to the define contribution plan	₩ 857

Other Income and Other Expens_3

Other Income and Other Expenses - Summary of Other Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Analysis of income and expense [abstract]
Foreign currency gain	₩ 970,306	₩ 969,425	₩ 1,543,909
Gain on disposal of property, plant and equipment	6,620	101,227	14,637
Gain on disposal of intangible assets	239	308
Reversal of impairment loss on intangible assets	348	35
Rental income	3,584	2,212	5,152
Others	23,040	8,539	28,103
Other income	₩ 1,004,137	₩ 1,081,746	₩ 1,591,801

Other Income and Other Expens_4

Other Income and Other Expenses - Summary of Other Expenses (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Analysis of income and expense [abstract]
Foreign currency loss	₩ 1,030,084	₩ 1,189,193	₩ 1,420,502
Other bad debt expenses	4	1,798
Loss on disposal of property, plant and equipment	15,048	20,030	7,466
Impairment loss on property, plant and equipment	43,601		1,610
Loss on disposal of intangible assets		30	75
Impairment loss on intangible assets	82	1,809	138
Donations	7,698	17,152	22,221
Expenses related to legal proceedings or claims and others	18,716	443	15,819
Other expenses	₩ 1,115,233	₩ 1,230,455	₩ 1,467,831

Finance Income and Finance Co_3

Finance Income and Finance Costs - Summary of Finance Income and Finance Costs recognized in Profit or Loss (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finance income
Interest income	₩ 69,020	₩ 60,106	₩ 42,079
Foreign currency gain	160,989	210,890	81,554
Gain on disposal of investments in equity accounted investees		3,669	11,367
Reversal of impairment loss of investments in equity accounted investees	802
Gain on transaction of derivatives	2,075	3,106	4,427
Gain on valuation of derivatives	13,059	1,070	244
Gain on disposal of available-for-sale financial assets		8
Gain on valuation of financial asset at fair value through profit or loss	8,186	170
Finance income	254,131	279,019	139,671
Finance costs
Interest expense	80,517	90,538	113,285
Foreign currency loss	184,309	126,642	132,320
Loss on disposal of investments in equity accounted investees	595	42,112	5,643
Loss on impairment of investments in equity accounted investees	17,397	4,234	6,137
Loss on impairment of available-for-sale financial assets		1,948	3,757
Loss on valuation of financial asset at fair value through profit or loss	225		118
Loss on sale of trade accounts and notes receivable	13,361	784	2,886
Loss on transaction of derivatives	49	514	334
Loss on valuation of derivatives	26,600		472
Others	3,840	2,084	1,234
Finance costs	₩ 326,893	₩ 268,856	₩ 266,186

Finance Income and Finance Co_4

Finance Income and Finance Costs - Finance Income and Costs Recognized in Other Comprehensive Income or Loss (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Analysis of income and expense [abstract]
Foreign currency translation differences for foreign operations	₩ (19,987)	₩ (231,738)	₩ (90,503)
Net change in fair value of available-for-sale financial assets			(77)
Tax effect			19
Finance income (costs) recognized in other comprehensive income (loss) after tax	₩ (19,987)	₩ (231,738)	₩ (90,561)

Income Taxes - Details of Incom

Income Taxes - Details of Income Tax Expense (Benefit) Recognized in Profit (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax expense
Current year	₩ 167,394	₩ 512,123	₩ 361,237
Adjustment for prior years	82,225
Current tax expense (income) and adjustments for current tax of prior periods	249,619	512,123	361,237
Deferred tax expense (benefit)
Origination and reversal of temporary differences	(226,360)	(104,835)	(49,190)
Change in unrecognized deferred tax assets	64,818	(11,708)	72,678
Deferred tax expense (benefit)	(161,542)	(116,543)	23,488
Actual income tax expense	₩ 88,077	₩ 395,580	₩ 384,725

Income Taxes - Income Taxes Rec

Income Taxes - Income Taxes Recognized Directly in Other Comprehensive Income (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income tax relating to components of other comprehensive income [abstract]
Net change in fair value of available-for-sale financial assets, before tax			₩ (77)
Remeasurements of net defined benefit liabilities (assets), before tax	₩ 5,690	₩ (16,260)	155,346
Foreign currency translation differences for foreign operations, before tax	(19,987)	(231,738)	(90,503)
Change in equity of equity method investee, before tax	57	1,346	(5,216)
Other comprehensive income, before tax	(14,240)	(246,652)	59,550
Net change in fair value of available-for-sale financial assets, tax benefit (expense)			19
Remeasurements of net defined benefit liabilities (assets), tax benefit (expense)	(1,169)	9,259	(37,594)
Foreign currency translation differences for foreign operations, tax benefit (expense)	0	0	0
Change in equity of equity method investee, tax benefit (expense)	0	0	0
Other comprehensive income, tax benefit (expense)	(1,169)	9,259	(37,575)
Net change in fair value of available-for-sale financial assets, net of tax			(58)
Remeasurements of net defined benefit liabilities (assets), net of tax	4,521	(7,001)	117,752
Foreign currency translation differences for foreign operations, net of tax	(19,987)	(231,738)	(90,503)
Change in equity of equity method investee, net of tax	57	1,346	(5,216)
Other comprehensive income (loss) for the year, net of income tax	₩ (15,409)	₩ (237,393)	₩ 21,975

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Actual Effective Tax Rate (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income tax relating to components of other comprehensive income [abstract]
Income tax using the statutory tax rate of each country	(33.60%)	28.54%	33.49%
Non-deductible expenses, percentage	(40.07%)	2.72%	3.39%
Tax credits, percentage	117.27%	(10.64%)	(11.45%)
Change in unrecognized deferred tax assets	(70.94%)	(0.50%)	5.52%
Adjustment for prior years	(90.00%)
Effect on change in tax rate, percentage	15.68%	(3.10%)
Others, percentage	5.25%	(0.06%)	(1.72%)
Actual effective tax rate		16.96%	29.23%
Profit (loss) before income taxes	₩ (91,366)	₩ 2,332,632	₩ 1,316,233
Income tax using the statutory tax rate of each country, amount	30,695	665,733	440,753
Non-deductible expenses, amount	36,608	63,416	44,606
Tax credits, amount	(107,146)	(248,191)	(150,663)
Change in unrecognized deferred tax assets, amount	64,818	(11,708)	72,678
Adjustment for prior years	82,225
Effect on change in tax rate (Note 24(d))	(14,326)	(72,376)
Others	(4,797)	(1,294)	(22,649)
Actual income tax expense	₩ 88,077	₩ 395,580	₩ 384,725

Deferred Tax Assets and Liabi_3

Deferred Tax Assets and Liabilities - Additional Information (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Temporary differences on investments in subsidiaries the Controlling Company did not recognize deferred tax liabilities	₩ 85,368	₩ 103,946
Recognized deferred tax assets in relation to tax credit carryforwards	₩ 308,393
Statutory tax rate attributable to owners of the Controlling Company	(70.94%)	(0.50%)	5.52%
Effective applicable tax rate	(33.60%)	28.54%	33.49%
Tax expense (income) at applicable tax rate	₩ 30,695	₩ 665,733	₩ 440,753
Parent [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Statutory tax rate attributable to owners of the Controlling Company		24.20%
Effective applicable tax rate		27.50%
Tax expense (income) at applicable tax rate		₩ 300,000

Deferred Tax Assets and Liabi_4

Deferred Tax Assets and Liabilities - Tax Credit Carryforwards Expiration Dates (Detail) - Tax credits carry forwards [member] ₩ in Millions	Dec. 31, 2018KRW (₩)
December 31, 2019 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Tax credit carryforwards	₩ 29,770
1-2 years [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Tax credit carryforwards	58,391
December 31, 2022 [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Tax credit carryforwards	₩ 91,862

Deferred Tax Assets and Liabi_5

Deferred Tax Assets and Liabilities - Details of Deferred Tax Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets	₩ 1,136,166	₩ 985,352
Liabilities	(15,087)	(24,646)
Gross carrying amount [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets	1,145,840	986,793
Liabilities	(24,761)	(26,087)
Total	1,121,079	960,706	₩ 834,903
Gross carrying amount [member] | Other accounts receivable, net [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Liabilities	(1,013)	(1,441)
Total	(1,013)	(1,441)	(1,190)
Gross carrying amount [member] | Inventories, net [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets	60,606	34,550
Total	60,606	34,550	35,771
Gross carrying amount [member] | Defined benefit obligations [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets		2,375
Total		2,375	10,817
Gross carrying amount [member] | Unrealised gains losses and others [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets	13,404	29,061
Total	13,404	29,061
Gross carrying amount [member] | Accrued expenses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets	126,072	183,903
Total	126,072	183,903	122,998
Gross carrying amount [member] | Property, plant and equipment [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets	445,721	409,928
Liabilities	(1,495)
Total	444,226	409,928	338,860
Gross carrying amount [member] | Intangible assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets	3,468	3,457
Liabilities	(14,588)	(24,646)
Total	(11,120)	(21,189)	(31,027)
Gross carrying amount [member] | Other provisions [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets	32,468	27,018
Total	32,468	27,018	15,051
Gross carrying amount [member] | Gain or loss on foreign currency translation, net [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets	13	13
Total	13	13	11
Gross carrying amount [member] | Others [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets	20,850	27,562
Liabilities	(7,665)
Total	13,185	27,562	21,435
Gross carrying amount [member] | Tax credits carry forwards [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets	308,393	268,926
Total	308,393	₩ 268,926	₩ 287,400
Gross carrying amount [member] | Tax loss carry forwards [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Assets	134,845
Total	₩ 134,845

Deferred Tax Assets and Liabi_6

Deferred Tax Assets and Liabilities - Changes in Deferred Tax Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Other comprehensive income	₩ (1,169)	₩ 9,259	₩ (37,575)
Gross carrying amount [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning balance	960,706	834,903
Profit or loss	161,542	116,544
Other comprehensive income	(1,169)	9,259
Ending balance	1,121,079	960,706	834,903
Gross carrying amount [member] | Other accounts receivable, net [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning balance	(1,441)	(1,190)
Profit or loss	428	(251)
Ending balance	(1,013)	(1,441)	(1,190)
Gross carrying amount [member] | Inventories, net [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning balance	34,550	35,771
Profit or loss	26,056	(1,221)
Ending balance	60,606	34,550	35,771
Gross carrying amount [member] | Defined benefit obligations [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning balance	2,375	10,817
Profit or loss	(1,206)	(17,701)
Other comprehensive income	(1,169)	9,259
Ending balance		2,375	10,817
Gross carrying amount [member] | Accrued expenses [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning balance	183,903	122,998
Profit or loss	(57,831)	60,905
Ending balance	126,072	183,903	122,998
Gross carrying amount [member] | Property, plant and equipment [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning balance	409,928	338,860
Profit or loss	34,298	71,068
Ending balance	444,226	409,928	338,860
Gross carrying amount [member] | Intangible assets [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning balance	(21,189)	(31,027)
Profit or loss	10,069	9,838
Ending balance	(11,120)	(21,189)	(31,027)
Gross carrying amount [member] | Other provisions [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning balance	27,018	15,051
Profit or loss	5,450	11,967
Ending balance	32,468	27,018	15,051
Gross carrying amount [member] | Gain or loss on foreign currency translation, net [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning balance	13	11
Profit or loss		2
Ending balance	13	13	11
Gross carrying amount [member] | Others [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning balance	27,562	21,435
Profit or loss	(14,377)	6,127
Ending balance	13,185	27,562	21,435
Gross carrying amount [member] | Tax credits carry forwards [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning balance	268,926	287,400
Profit or loss	39,467	(18,474)
Ending balance	308,393	268,926	287,400
Gross carrying amount [member] | Tax loss carry forwards [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Profit or loss	134,845
Ending balance	134,845
Gross carrying amount [member] | Subsidiaries and associates [member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Beginning balance	29,061	34,777
Profit or loss	(15,657)	(5,716)
Ending balance	₩ 13,404	₩ 29,061	₩ 34,777

Earnings (Loss) Per Share Att_3

Earnings (Loss) Per Share Attributable to Owners of the Controlling Company - Summary of Basic Earnings per Share (Detail) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic earnings per share [abstract]
Profit (loss) attributable to owners of the Controlling Company	₩ (207,239)	₩ 1,802,756	₩ 906,713
Weighted-average number of common stocks outstanding	357,815,700	357,815,700	357,815,700
Earnings (loss) per share	₩ (579)	₩ 5,038	₩ 2,534

Financial Risk Management - Exp

Financial Risk Management - Exposure to Foreign Currency Risk Based on Notional Amounts (Detail) € in Millions, ₫ in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, zł in Millions, $ in Millions, $ in Millions	Dec. 31, 2018KRW (₩)	Dec. 31, 2018CNY (¥)	Dec. 31, 2018USD ($)	Dec. 31, 2018EUR (€)	Dec. 31, 2018JPY (¥)	Dec. 31, 2018PLN (zł)	Dec. 31, 2018TWD ($)	Dec. 31, 2018VND (₫)	Dec. 31, 2017KRW (₩)	Dec. 31, 2017CNY (¥)	Dec. 31, 2017USD ($)	Dec. 31, 2017EUR (€)	Dec. 31, 2017JPY (¥)	Dec. 31, 2017PLN (zł)	Dec. 31, 2017TWD ($)	Dec. 31, 2017VND (₫)	Dec. 31, 2016KRW (₩)	Dec. 31, 2015KRW (₩)
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Cash and cash equivalents	₩ 2,365,022								₩ 2,602,560								₩ 1,558,696	₩ 751,662
Deposits in banks	78,411								758,089
Trade accounts and notes receivable	2,829,163								4,325,120
Non-trade receivable	159,238								150,554
Other assets denominated in foreign currencies	3,087,461								2,875,090
Other accounts payable	3,566,629								3,169,937
Borrowings	₩ (8,558,777)								₩ (5,603,118)
Currency risk [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Cash and cash equivalents		¥ 5,515	$ 790	€ 8	¥ 83	zł 206	$ 121	₫ 2,070,889		¥ 6,940	$ 1,228	€ 3	¥ 152	zł 165	$ 16	₫ 342,063
Deposits in banks | ¥										750
Trade accounts and notes receivable		1,098	2,175		7					1,453	3,316		11
Non-trade receivable		201	21	4	852		3	23,182		136	62	9	1,340		2	13,405
Other assets denominated in foreign currencies		11,157	33	12	220	23	108	2,782
Other assets denominated in foreign currencies		(2,862)	(863)		(12,501)			(355,390)		596	1		206		7	1,882
Trade accounts and notes payable										(2,843)	(1,345)		(14,898)			(102,398)
Other accounts payable		(4,762)	(928)	(3)	(20,326)	(4)	(6)	(1,585,130)		(2,403)	(285)	(8)	(14,653)	(4)	(11)	(2,138,370)
Borrowings		(5,198)	(2,571)							(3,263)	(1,500)
Aggregate notional amounts in financial position		5,149	(1,343)	21	(31,665)	225	226	156,333
Currency swap contracts | $			780
Net exposure		¥ 5,149	$ (563)	€ 21	¥ (31,665)	zł 225	$ 226	₫ 156,333		¥ 1,366	$ 1,477	€ 4	¥ (27,842)	zł 161	$ 14	₫ (1,883,418)

Financial Risk Management - Ave

Financial Risk Management - Average Exchange Rates Applied during Reporting Periods (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
USD [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Average rate	1,100.2100	1,131.0800	1,159.8300
Reporting date spot rate	1,118.1000	1,071.4000
JPY [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Average rate	9.9600	10.0900	10.6700
Reporting date spot rate	10.1300	9.4900
CNY [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Average rate	166.4100	167.5200	174.4000
Reporting date spot rate	162.7600	163.6500
TWD [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Average rate	36.5100	37.1600	35.9700
Reporting date spot rate	36.5800	35.9200
EUR [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Average rate	1,298.5300	1,277.0100	1,283.9500
Reporting date spot rate	1,279.1600	1,279.2500
PLN [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Average rate	304.8700	299.9800	294.4100
Reporting date spot rate	297.3300	306.0700
VND [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Average rate	0.0478	0.0498	0.0518
Reporting date spot rate	0.0482	0.0472

Financial Risk Management - Sum

Financial Risk Management - Summary of Changes in Equity and Profit or Loss (Detail) - 5 percent weakening in exchange rate [member] - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Equity [member] | USD [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	₩ (46,136)	₩ 50,040
Equity [member] | JPY [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	(12,060)	(10,294)
Equity [member] | CNY [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	41,779	13,212
Equity [member] | TWD [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	413	23
Equity [member] | EUR [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	1,197	16
Equity [member] | PLN [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	3,451	2,515
Equity [member] | VND [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	273	(4,445)
Profit and loss [member] | USD [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	38,725	91,238
Profit and loss [member] | JPY [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	(10,497)	(9,141)
Profit and loss [member] | CNY [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	318	(6,396)
Profit and loss [member] | TWD [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	1	1
Profit and loss [member] | EUR [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	390	594
Profit and loss [member] | PLN [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	(236)	₩ (120)
Profit and loss [member] | VND [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Increase (decrease) due to a change in the exchange rate	₩ 273

Financial Risk Management - Int

Financial Risk Management - Interest Rate Profile of Interest-bearing Financial Instruments (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial instruments by type of interest rate [Line Items]
Financial liabilities	₩ (15,252,683)
Fixed rate instruments [member]
Disclosure of financial instruments by type of interest rate [Line Items]
Financial assets	2,443,583	₩ 3,360,800
Financial liabilities	(5,033,515)	(2,962,671)
Financial assets and liabilities	(2,589,932)	398,129
Variable rate instruments [member]
Disclosure of financial instruments by type of interest rate [Line Items]
Financial liabilities	₩ (3,525,262)	₩ (2,640,447)

Financial Risk Management - Equ

Financial Risk Management - Equity and Profit or Loss Sensitivity Analysis for Variable Rate Instruments (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
1% increase in interest rates [member] | Equity [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
(Increase) decrease due to a change in the interest rate	₩ (25,558)	₩ (17,362)
Percentage change in interest rate	1.00%	1.00%
1% increase in interest rates [member] | Profit and loss [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
(Increase) decrease due to a change in the interest rate	₩ (25,558)	₩ (17,362)
Percentage change in interest rate	1.00%	1.00%
1% decrease in interest rates [member] | Equity [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
(Increase) decrease due to a change in the interest rate	₩ 25,558	₩ 17,362
Percentage change in interest rate	1.00%	1.00%
1% decrease in interest rates [member] | Profit and loss [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
(Increase) decrease due to a change in the interest rate	₩ 25,558	₩ 17,362
Percentage change in interest rate	1.00%	1.00%

Financial Risk Management - Max

Financial Risk Management - Maximum Exposure to Credit Risk of Financial Assets (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Cash and cash equivalents	₩ 2,365,022	₩ 2,602,560	₩ 1,558,696	₩ 751,662
Deposits in banks	78,411	758,089
Trade accounts and notes receivable	2,829,163	4,325,120
Non-trade receivable	159,238	150,554
Accrued income	10,075	14,273
Financial assets at fair value through profit or loss		1,552
Deposits	91,123	30,378
Short-term loans	16,116	16,766
Long-term loans	55,048	32,408
Long-term non-trade receivable	11,448	8,738
Derivatives		842
Credit risk [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Cash and cash equivalents	2,365,022	2,602,560
Deposits in banks	78,411	758,089
Trade accounts and notes receivable	2,829,163	4,325,120
Non-trade receivable	159,238	150,554
Accrued income	10,075	14,273
Available-for-sale financial assets		162
Financial assets at fair value through profit or loss		1,552
Deposits	91,123	30,378
Short-term loans	16,116	16,766
Long-term loans	55,048	32,408
Long-term non-trade receivable	11,448	8,738
Derivatives		842
Financial assets carried at amortized cost	5,615,644
Financial assets		₩ 7,941,442
Financial assets at fair value through profit or loss	14,386
Financial assets at fair value through other comprehensive income	5,630,191
Convertible bonds [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets at fair value through profit or loss	1,327
Financial assets at fair value through profit or loss	1,327
Convertible bonds [member] | Credit risk [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets at fair value through profit or loss	1,327
Derivatives [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets at fair value through profit or loss	13,059
Derivatives [member] | Credit risk [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets at fair value through profit or loss	13,059
Debt instrument [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets at fair value through other comprehensive income	161
Debt instrument [member] | Credit risk [member]
Disclosure of nature and extent of risks arising from financial instruments [Line Items]
Financial assets at fair value through other comprehensive income	₩ 161

Financial Risk Management - Con

Financial Risk Management - Contractual Maturities of Financial Liabilities, Including Estimated Interest Payments (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of maturity analysis for financial liabilities [Line Items]
Secured bank borrowings	₩ 268,093	₩ 642,172
Unsecured bank borrowings	5,958,427	2,950,184
Unsecured bond issues	2,332,257	2,010,762
Trade accounts and notes payable	3,087,461	2,875,090
Other accounts payable	3,566,629	3,169,937
Long-term other accounts payable	3,103	₩ 2
Security deposits	10,955
Derivatives	25,758
Financial liabilities	15,252,683
Unsecured bond issues	2,537,553
Derivatives	(35,140)
Contractual cash flows for financial liabilities	16,027,253
6 months or less [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Unsecured bond issues	291,738
Derivatives	(6,742)
Contractual cash flows for financial liabilities	7,772,078
6-12 months [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Unsecured bond issues	328,400
Derivatives	(6,728)
Contractual cash flows for financial liabilities	679,555
1-2 years [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Unsecured bond issues	456,990
Derivatives	(12,517)
Contractual cash flows for financial liabilities	1,430,637
2-5 years [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Unsecured bond issues	1,320,248
Derivatives	(9,153)
Contractual cash flows for financial liabilities	5,481,803
More than 5 years [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Unsecured bond issues	140,177
Contractual cash flows for financial liabilities	663,180
Secured bank borrowings [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Bank borrowings	268,190
Secured bank borrowings [member] | 6 months or less [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Bank borrowings	268,190
Unsecured bank borrowings [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Bank borrowings	6,588,502
Unsecured bank borrowings [member] | 6 months or less [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Bank borrowings	565,832
Unsecured bank borrowings [member] | 6-12 months [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Bank borrowings	356,688
Unsecured bank borrowings [member] | 1-2 years [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Bank borrowings	973,297
Unsecured bank borrowings [member] | 2-5 years [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Bank borrowings	4,169,682
Unsecured bank borrowings [member] | More than 5 years [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Bank borrowings	523,003
Trade accounts and notes payable [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Trade and other payables	3,087,461
Trade accounts and notes payable [member] | 6 months or less [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Trade and other payables	3,087,461
Other accounts payable [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Trade and other payables	3,566,629
Other accounts payable [member] | 6 months or less [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Trade and other payables	3,565,599
Other accounts payable [member] | 6-12 months [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Trade and other payables	1,030
Long-term other accounts payable [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Trade and other payables	3,103
Long-term other accounts payable [member] | 1-2 years [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Trade and other payables	2,077
Long-term other accounts payable [member] | 2-5 years [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Trade and other payables	1,026
Security Deposits [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Trade and other payables	10,955
Security Deposits [member] | 6-12 months [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Trade and other payables	165
Security Deposits [member] | 1-2 years [member]
Disclosure of maturity analysis for financial liabilities [Line Items]
Trade and other payables	₩ 10,790

Financial Risk Management - S_2

Financial Risk Management - Summary of Capital Management (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of objectives, policies and processes for managing capital [abstract]
Total liabilities	₩ 18,289,464	₩ 14,178,177
Total equity	14,886,246	14,981,510	₩ 13,462,388	₩ 12,704,956
Cash and deposits in banks	2,443,422	3,360,638
Borrowings (including bonds)	₩ 8,558,777	₩ 5,603,118
Total liabilities to equity ratio	123.00%	95.00%
Net borrowings to equity ratio	41.00%	15.00%

Financial Risk Management - Fai

Financial Risk Management - Fair Values of Financial Assets and Liabilities, Together with Carrying Amounts Shown in Consolidated Statement of Financial Position (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of detailed information about financial instruments [Line Items]
Financial asset at fair value through profit or loss		₩ 1,552
Derivatives		842
Cash and cash equivalents	₩ 2,365,022	2,602,560	₩ 1,558,696	₩ 751,662
Deposits in banks	78,411	758,089
Trade accounts and notes receivable	2,829,163	4,325,120
Non-trade receivable	159,238	150,554
Accrued income	10,075	14,273
Deposits	91,123	30,378
Short-term loans	16,116	16,766
Long-term loans	55,048	32,408
Long-term non-trade receivable	11,448	8,738
Derivatives	25,758
Secured bank borrowings	268,093	642,172
Unsecured bank borrowings	5,958,427	2,950,184
Unsecured bond issues	2,332,257	2,010,762
Trade accounts and notes payable	3,087,461	2,875,090
Other accounts payable	3,566,629	3,169,937
Long-term other accounts payable	3,103	2
Security deposits	10,955
Fair values [member]
Disclosure of detailed information about financial instruments [Line Items]
Available-for-sale financial assets		162
Financial asset at fair value through profit or loss		1,552
Derivatives	13,059	842
Derivatives	25,758
Secured bank borrowings	268,093	642,172
Unsecured bank borrowings	6,013,903	2,955,399
Unsecured bond issues	2,384,987	2,016,086
Other accounts payable		3,170,147
Equity instrument [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets at fair value through profit or loss	13,681
Equity instrument [member] | Fair values [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets at fair value through profit or loss	13,681
Debt securities [member]
Disclosure of detailed information about financial instruments [Line Items]
Available-for-sale financial assets		162
Debt securities [member] | Fair values [member]
Disclosure of detailed information about financial instruments [Line Items]
Available-for-sale financial assets		₩ 162
Convertible bonds [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial asset at fair value through profit or loss	1,327
Financial assets at fair value through profit or loss	1,327
Convertible bonds [member] | Fair values [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets at fair value through profit or loss	1,327
Derivatives [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets at fair value through profit or loss	13,059
Derivatives [member] | Fair values [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets at fair value through profit or loss	13,059
Debt instrument [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets at fair value through other comprehensive income	161
Debt instrument [member] | Fair values [member]
Disclosure of detailed information about financial instruments [Line Items]
Financial assets at fair value through other comprehensive income	₩ 161

Financial Risk Management - F_2

Financial Risk Management - Fair Value Hierarchy Classifications of Financial Instruments Measured at Fair Value (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [Line Items]
Financial assets at fair value through profit or loss		₩ 1,552
Derivatives		842
Derivatives, liabilities	₩ 25,758
Fair values [member]
Disclosure of detailed information about financial instruments [Line Items]
Equity instrument	13,681
Available-for-sale financial assets		162
Convertible bonds	1,327
Financial assets at fair value through profit or loss		1,552
Derivatives	13,059	842
Debt instrument	161
Derivatives, liabilities	25,758
Fair values [member] | Level 1 [member]
Disclosure of detailed information about financial instruments [Line Items]
Available-for-sale financial assets		162
Debt instrument	161
Fair values [member] | Level 3 [member]
Disclosure of detailed information about financial instruments [Line Items]
Equity instrument	13,681
Convertible bonds	1,327
Financial assets at fair value through profit or loss		1,552
Derivatives	13,059	₩ 842
Derivatives, liabilities	₩ 25,758

Financial Risk Management - F_3

Financial Risk Management - Fair Value Hierarchy Classifications, Valuation Technique and Inputs for Fair Value Measurements of Financial Instruments not Measured at Fair Value (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of liabilities [Line Items]
Secured bank borrowings	₩ 268,093	₩ 642,172
Unsecured bank borrowings	5,958,427	2,950,184
Unsecured bond issues	2,332,257	2,010,762
Other accounts payable	₩ 3,566,629	₩ 3,169,937
Borrowings, bonds and others [member] | Bottom of range [member]
Disclosure of fair value measurement of liabilities [Line Items]
Borrowings, bonds and others	2.09%	1.57%
Borrowings, bonds and others [member] | Top of range [member]
Disclosure of fair value measurement of liabilities [Line Items]
Borrowings, bonds and others	3.37%	2.92%
Not measured at fair value but for which the fair value is disclosed [member] | Secured bank borrowings [member]
Disclosure of fair value measurement of liabilities [Line Items]
Valuation technique	Discounted cash flow	Discounted cash flow
Input	Discount rate	Discount rate
Not measured at fair value but for which the fair value is disclosed [member] | Unsecured bank borrowings [member]
Disclosure of fair value measurement of liabilities [Line Items]
Valuation technique	Discounted cash flow	Discounted cash flow
Input	Discount rate	Discount rate
Not measured at fair value but for which the fair value is disclosed [member] | Unsecured bond issues [member]
Disclosure of fair value measurement of liabilities [Line Items]
Valuation technique	Discounted cash flow	Discounted cash flow
Input	Discount rate	Discount rate
Not measured at fair value but for which the fair value is disclosed [member] | Other accounts payable [member]
Disclosure of fair value measurement of liabilities [Line Items]
Valuation technique		Discounted cash flow
Input		Discount rate
Not measured at fair value but for which the fair value is disclosed [member] | Level 3 [member]
Disclosure of fair value measurement of liabilities [Line Items]
Secured bank borrowings	₩ 268,093	₩ 642,172
Unsecured bank borrowings	6,013,903	2,955,399
Unsecured bond issues	₩ 2,384,987	2,016,086
Other accounts payable		₩ 3,170,147

Changes in Liabilities Arisin_3

Changes in Liabilities Arising from Financing Activities - Summary of Changes in Liabilities Arising from Financing Activities (Detail) ₩ in Millions	12 Months Ended
	Dec. 31, 2018KRW (₩)
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	₩ 5,603,118
Cash flows from financing activities	2,851,309
Exchange rate effect	101,851
Effective interest adjustment	2,499
Ending balance	8,558,777
Short-term borrowings [member]
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Cash flows from financing activities	(720)
Exchange rate effect	720
Current portion of long-term borrowings and bonds [member]
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	1,452,926
Cash flows from financing activities	(1,859,098)
Reclassification	1,904,888
Exchange rate effect	54,659
Effective interest adjustment	532
Ending balance	1,553,907
Long-term borrowings [member]
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	2,644,189
Cash flows from financing activities	3,882,958
Reclassification	(1,345,520)
Exchange rate effect	50,644
Ending balance	5,232,271
Bonds [member]
Disclosure of reconciliation of liabilities arising from financing activities [Line Items]
Beginning balance	1,506,003
Cash flows from financing activities	828,169
Reclassification	(559,368)
Exchange rate effect	(4,172)
Effective interest adjustment	1,967
Ending balance	₩ 1,772,599

Related Parties and Others - Si

Related Parties and Others - Significant Transactions, Trade Accounts and Notes Receivable and Payable Occurred in Normal Course of Business with Related Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [Line Items]
Sales and others	₩ 4,205,596	₩ 5,436,726	₩ 5,343,221
Dividend income	5,272	8,639	59,820
Purchase of raw material and others	555,463	637,355	1,154,517
Acquisition of property, plant and equipment	1,694,360	1,424,647	925,390
Outsourcing fees	71,403	90,789	80,723
Other costs	265,568	188,824	180,902
Trade accounts and notes receivable and others	564,887	1,062,789
Trade accounts and notes payable and others	682,311	581,704
Joint ventures [Member] | Suzhou Raken Technology Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others			59,388
Dividend income			29,902
Other costs			543
Associates [Member]
Disclosure of transactions between related parties [Line Items]
Sales and others	1,112	15,813	207,254
Dividend income	5,272	8,639	29,918
Purchase of raw material and others	371,130	389,303	921,592
Acquisition of property, plant and equipment	201,303	157,518	185,354
Outsourcing fees	71,403	90,789	80,723
Other costs	9,747	10,124	12,624
Trade accounts and notes receivable and others	2,000	2,750
Trade accounts and notes payable and others	101,279	88,287
Associates [Member] | New Optics Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others		1	2,469
Purchase of raw material and others			50,372
Outsourcing fees		4	7,569
Other costs		6	255
Associates [Member] | New Optics USA, Inc.[member]
Disclosure of transactions between related parties [Line Items]
Outsourcing fees			509
Associates [Member] | NEWOPTIX RS. SA DE CV [member]
Disclosure of transactions between related parties [Line Items]
Sales and others			33
Associates [Member] | INVENIA Co., Ltd. (LIG INVENIA Co., Ltd.) [member]
Disclosure of transactions between related parties [Line Items]
Sales and others			54
Dividend income	30
Purchase of raw material and others	1,608	1,862	1,429
Acquisition of property, plant and equipment	58,111	66,548	48,398
Other costs	896	2,259	261
Trade accounts and notes receivable and others	2,000	2,375
Trade accounts and notes payable and others	30,179	18,662
Associates [Member] | TLI Inc. [Member]
Disclosure of transactions between related parties [Line Items]
Dividend income			101
Purchase of raw material and others			57,429
Other costs			2,238
Associates [Member] | AVACO Co., Ltd. [Member]
Disclosure of transactions between related parties [Line Items]
Dividend income			128
Purchase of raw material and others			703
Acquisition of property, plant and equipment			31,299
Other costs			1,373
Trade accounts and notes payable and others	4,382	2,949
Associates [Member] | AVATEC Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Dividend income	530	530	265
Outsourcing fees	71,403	90,785	70,196
Other costs	905	720	1,027
Associates [Member] | Paju Electric Glass Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Dividend income	4,172	8,109	21,030
Purchase of raw material and others	364,183	380,815	453,463
Other costs	4,411	4,225	3,674
Trade accounts and notes payable and others	60,566	60,141
Associates [Member] | Shinbo Electric Co., Ltd. [Member]
Disclosure of transactions between related parties [Line Items]
Sales and others		15,812	204,637
Purchase of raw material and others			355,607
Outsourcing fees			2,449
Other costs		21	1,097
Associates [Member] | Narenanotech corporation [member]
Disclosure of transactions between related parties [Line Items]
Sales and others			17
Purchase of raw material and others		279	513
Acquisition of property, plant and equipment		21,727	24,821
Other costs		244	909
Associates [Member] | WooRee E&L Co Ltd [member]
Disclosure of transactions between related parties [Line Items]
Purchase of raw material and others	58
Other costs	144	175	32
Associates [Member] | YAS Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others			44
Purchase of raw material and others	5,281	6,347	2,076
Acquisition of property, plant and equipment	143,192	69,243	80,836
Other costs	3,391	2,474	1,758
Trade accounts and notes receivable and others		375
Trade accounts and notes payable and others	6,145	6,474
Associates [Member] | LB Gemini new growth fund no.16 [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	1,112
Dividend income	540		8,394
Associates [Member] | WooRee E&L Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Trade accounts and notes payable and others	7	61
Entity that has significant influence over the controlling company [member] | LG Electronics Inc. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	1,215,153	1,689,381	1,580,279
Purchase of raw material and others	36,522	47,898	23,047
Acquisition of property, plant and equipment	1,041,563	906,427	538,175
Other costs	127,775	109,865	103,158
Trade accounts and notes receivable and others	247,679	550,335
Trade accounts and notes payable and others	430,677	257,071
Subsidiaries of the entity that has significant influence over the Controlling Company [Member]
Disclosure of transactions between related parties [Line Items]
Sales and others	2,989,331	3,731,532	3,496,300
Purchase of raw material and others	147,811	200,154	209,878
Acquisition of property, plant and equipment	451,494	360,702	201,861
Other costs	128,046	68,835	64,577
Trade accounts and notes receivable and others	315,208	509,704
Trade accounts and notes payable and others	150,355	236,346
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics India Pvt. Ltd. [Member]
Disclosure of transactions between related parties [Line Items]
Sales and others	71,798	71,597	75,591
Other costs	103	163	69
Trade accounts and notes receivable and others	9,047	3,030
Trade accounts and notes payable and others	29
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics Vietnam Haiphong Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	173,051	205,934	162,893
Acquisition of property, plant and equipment	4,541	8,892
Other costs	166	198	141
Trade accounts and notes receivable and others	25,544	36,017
Trade accounts and notes payable and others		3,917
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics Nanjing New Technology Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	223,524	300,785	229,773
Acquisition of property, plant and equipment	424	245	293
Other costs	1,528	379	1,876
Trade accounts and notes receivable and others	43,463	46,373
Trade accounts and notes payable and others	139	699
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics RUS, LLC [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	106,631	103,479	127,316
Other costs	2,673	963	2,993
Trade accounts and notes receivable and others	22,570	25,102
Trade accounts and notes payable and others	90	80
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics do Brasil Ltda. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	192,775	228,821	133,903
Other costs	350	430	3,430
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Innotek Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	29,267	14,836	11,503
Purchase of raw material and others	147,453	199,896	209,878
Other costs	39,136	5,692	9,873
Trade accounts and notes receivable and others	2,885	407
Trade accounts and notes payable and others	47,382	62,675
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | Qingdao LG Inspur Digital Communication Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	37,738	77,787	47,804
Trade accounts and notes receivable and others	3,530	13,061
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | Inspur LG Digital Mobile Communications Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	131,970	230,832	370,966
Other costs	1		5
Trade accounts and notes receivable and others	13,172	55,278
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics Mexicalli, S.A. DE C.V [member]
Disclosure of transactions between related parties [Line Items]
Sales and others			210,021
Other costs			77
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics Mlawa Sp. z o.o. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	740,784	847,565	709,558
Other costs	631	985	895
Trade accounts and notes receivable and others	70,236	136,874
Trade accounts and notes payable and others	33	25
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics Taiwan Taipei Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	12,746	13,693	11,919
Other costs	330	164	27
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics Wroclaw Sp. z o.o. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others			290,785
Other costs			99
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Hitachi Water Solutions Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	9,100
Acquisition of property, plant and equipment	304,365	318,978	167,987
Other costs	8,980	1,532	2,782
Trade accounts and notes receivable and others	9,100
Trade accounts and notes payable and others	50,425	154,864
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics Reynosa, S.A. DE C.V. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	1,030,414	1,287,340	1,074,790
Other costs	2,021	1,926	1,907
Trade accounts and notes receivable and others	69,189	137,413
Trade accounts and notes payable and others	134	82
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics Almaty Kazakhstan [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	3,759	14,079	15,953
Other costs	42	53	33
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics Air-Conditioning (Shandong) Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Purchase of raw material and others	330	255
Acquisition of property, plant and equipment	26,871	3,744	4,994
Other costs	7,264	2,621	259
Trade accounts and notes payable and others	17,654
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | Hi Entech Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Acquisition of property, plant and equipment	22,378	6,991
Other costs	29,215	34,432	25,365
Trade accounts and notes payable and others	16,816	6,679
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | Hientech (Tianjin) Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Acquisition of property, plant and equipment	92,900	21,838	28,587
Other costs	23,880	11,822	10,613
Trade accounts and notes payable and others	16,345	5,600
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics S.A. Pty Ltd [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	7,244	14,155	21,236
Other costs	20	25	39
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | Other related parties [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	5,195	857	2,289
Purchase of raw material and others	28	3
Acquisition of property, plant and equipment	15	14
Other costs	11,480	7,264	₩ 4,094
Trade accounts and notes receivable and others	5,263	7,618
Trade accounts and notes payable and others	1,246	1,714
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics Mexicali, S.A. DE C.V. [Member]
Disclosure of transactions between related parties [Line Items]
Sales and others	187,844	319,772
Other costs	210	186
Trade accounts and notes receivable and others	15,305	29,440
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics Egypt S.A.E. [member]
Disclosure of transactions between related parties [Line Items]
Sales and others	25,491
Other costs	16
Trade accounts and notes receivable and others	10,296
Trade accounts and notes payable and others		1
Subsidiaries of the entity that has significant influence over the Controlling Company [Member] | LG Electronics do Brasil Ltd [member]
Disclosure of transactions between related parties [Line Items]
Trade accounts and notes receivable and others	15,608	19,091
Trade accounts and notes payable and others	₩ 62	₩ 10

Related Parties and Others - De

Related Parties and Others - Details of Significant Cash Transactions of Loans and Collection of Loans Occurred in Normal Course of Business with Related Parties (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of transactions between related parties [Line Items]
Beginning balance	₩ 3,850	₩ 2,966
Increase		2,000
Decrease		1,116
Ending balance		3,850
InveniaCoLtdAnd YasCoLtdMember [member]
Disclosure of transactions between related parties [Line Items]
Beginning balance	2,750
Decrease	750
Ending balance	2,000	2,750
New Optics Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Beginning balance	875	1,000
Decrease		125
Ending balance		875
INVENIA Co., Ltd. (LIG INVENIA Co., Ltd.) [member]
Disclosure of transactions between related parties [Line Items]
Beginning balance	2,375	833
Increase		2,000
Decrease		458
Ending balance		2,375
INVENIA Co., Ltd. (LIG INVENIA Co., Ltd.) [member] | InveniaCoLtdAnd YasCoLtdMember [member]
Disclosure of transactions between related parties [Line Items]
Beginning balance	2,375
Decrease	375
Ending balance	2,000	2,375
Narenanotech corporation [member]
Disclosure of transactions between related parties [Line Items]
Beginning balance	225	300
Decrease		75
Ending balance		225
YAS Co., Ltd. [member]
Disclosure of transactions between related parties [Line Items]
Beginning balance	375	833
Decrease		458
Ending balance		375
YAS Co., Ltd. [member] | InveniaCoLtdAnd YasCoLtdMember [member]
Disclosure of transactions between related parties [Line Items]
Beginning balance	375
Decrease	₩ 375
Ending balance		₩ 375

Related Parties and Others - Co

Related Parties and Others - Compensation Costs of Key Management (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of transactions between related parties [abstract]
Short-term benefits	₩ 2,622	₩ 3,724	₩ 2,323
Expenses related to the defined benefit plan	794	488	897
Key management personnel compensation	₩ 3,416	₩ 4,212	₩ 3,220

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information - Summary of Non-cash Investing and Financing Activities (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of cash flows [abstract]
Changes in other accounts payable arising from the purchase of property, plant and equipment	₩ 516,734	₩ 632,355	₩ 809,406

Non-current Assets Held for S_3

Non-current Assets Held for Sale - Schedule of Non-current Assets as Held for Sale (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Non-current Assets Held for Sale [line items]
Property, plant and equipment	₩ 21,600,130	₩ 16,201,960	₩ 12,031,449
Non-current assets held for sale [member]
Non-current Assets Held for Sale [line items]
Property, plant and equipment	₩ 70,161