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Financial Risk Management - Schedule of Financial Assets and Liabilities Exposed in Foreign Currency Risk (Details) € in Millions, ₫ in Millions, ₩ in Millions, ฿ in Millions, ¥ in Millions, £ in Millions, Rp in Millions, $ in Millions, $ in Millions, $ in Millions	Dec. 31, 2020 KRW (₩)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 JPY (¥)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 IDR (Rp)	Dec. 31, 2020 THB (฿)	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 VND (₫)	Dec. 31, 2019 KRW (₩)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 JPY (¥)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 IDR (Rp)	Dec. 31, 2019 THB (฿)	Dec. 31, 2019 TWD ($)	Dec. 31, 2019 VND (₫)	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 HKD ($)
Disclosure Of Financial Instruments [Line Items]
Financial assets | ₩	₩ 40,413								₩ 15,878
Financial liabilities | ₩	19,329								10,542
USD
Disclosure Of Financial Instruments [Line Items]
Financial assets	31,775	$ 29,204,905							9,403	$ 8,100,729
Financial liabilities	17,099	$ 15,715,800							6,696	$ 5,775,721
JPY
Disclosure Of Financial Instruments [Line Items]
Financial assets	4,099		¥ 388,760,925						4,854		¥ 456,300,430
Financial liabilities	2,092		¥ 198,432,867						3,621		¥ 340,468,613
EUR
Disclosure Of Financial Instruments [Line Items]
Financial assets	461			€ 344,842					439			€ 338,598
Financial liabilities	11			€ 8,399					1			€ 1,000
IDR
Disclosure Of Financial Instruments [Line Items]
Financial assets	1				Rp 12,955,000				1				Rp 12,955,000
Financial liabilities	1				Rp 15,289,944				1				Rp 17,023,944
THB
Disclosure Of Financial Instruments [Line Items]
Financial assets	1					฿ 28,510			1					฿ 28,510
Financial liabilities | ฿						฿ 7,379								฿ 7,379
TWD
Disclosure Of Financial Instruments [Line Items]
Financial assets	4,076						$ 105,408,193		1,125						$ 29,236,669
Financial liabilities	₩ 126						$ 3,264,754		214						$ 5,567,672
VND
Disclosure Of Financial Instruments [Line Items]
Financial assets | ₫								₫ 9,270,000								₫ 9,270,000
Financial liabilities | ₫								₫ 3,243,600								₫ 3,243,600
GBP
Disclosure Of Financial Instruments [Line Items]
Financial liabilities									9								£ 5,625
HKD
Disclosure Of Financial Instruments [Line Items]
Financial assets									₩ 55									$ 368,048

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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