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Classification of Financial Instruments - Classification of financial liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Categories of current financial liabilities
Borrowings	₩ 1,315,134		₩ 1,172,624
Debt securities	7,542,705		6,788,824
Derivative liabilities	73,064		20,431	₩ 71,267
Trade and other payables	6,649,402	₩ 6,915,699	6,405,395
Total current financial liabilities	15,580,305		14,387,274
Categories of non-current financial liabilities
Borrowings	3,389,743		3,258,015
Debt securities	55,628,959		49,815,164
Derivative liabilities	96,896		291,732	₩ 356,792
Trade and other payables	6,965,760	₩ 7,374,976	2,941,696
Total non-current financial liabilities	66,081,358		56,306,607
Total financial liabilities	81,661,663		70,693,881
Financial liabilities at fair value through profit or loss
Categories of current financial liabilities
Borrowings	0		0
Debt securities	0		0
Derivative liabilities	13,286		13,706
Trade and other payables	0		0
Total current financial liabilities	13,286		13,706
Categories of non-current financial liabilities
Borrowings	0		0
Debt securities	0		0
Derivative liabilities	39,861		85,304
Trade and other payables	0		0
Total non-current financial liabilities	39,861		85,304
Total financial liabilities	53,147		99,010
Financial liabilities recognized at amortized cost
Categories of current financial liabilities
Borrowings	1,315,134		1,172,624
Debt securities	7,542,705		6,788,824
Derivative liabilities	0		0
Trade and other payables	6,649,402		6,405,395
Total current financial liabilities	15,507,241		14,366,843
Categories of non-current financial liabilities
Borrowings	3,389,743		3,258,015
Debt securities	55,628,959		49,815,164
Derivative liabilities	0		0
Trade and other payables	6,965,760		2,941,696
Total non-current financial liabilities	65,984,462		56,014,875
Total financial liabilities	81,491,703		70,381,718
Derivative liabilities (using hedge accounting)
Categories of current financial liabilities
Borrowings	0		0
Debt securities	0		0
Derivative liabilities	59,778		6,725
Trade and other payables	0		0
Total current financial liabilities	59,778		6,725
Categories of non-current financial liabilities
Borrowings	0		0
Debt securities	0		0
Derivative liabilities	57,035		206,428
Trade and other payables	0		0
Total non-current financial liabilities	57,035		206,428
Total financial liabilities	₩ 116,813		₩ 213,153

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The amount of current borrowings and current portion of non-current borrowings. [Refer: Borrowings]

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) 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 deliver 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, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are 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. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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The non-current portion of non-current borrowings. [Refer: Borrowings]

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