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Classification of Financial Instruments - Classification of financial liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Categories of current financial liabilities
Borrowings	₩ 1,172,624	₩ 1,165,985
Debt securities	6,788,824	7,957,300
Derivative liabilities	20,431	71,267	₩ 3,251
Trade and other payables	6,405,395	5,999,521
Total current financial liabilities	14,387,274	15,194,073
Categories of non-current financial liabilities
Borrowings	3,258,015	2,434,624
Debt securities	49,815,164	43,189,483
Derivative liabilities	291,732	356,792	₩ 135,435
Trade and other payables	2,941,696	3,223,480
Total non-current financial liabilities	56,306,607	49,204,379
Total financial liabilities	70,693,881	64,398,452
Financial liabilities at fair value through profit or loss
Categories of current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	13,706	51,090
Trade and other payables	0	0
Total current financial liabilities	13,706	51,090
Categories of non-current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	85,304	99,839
Trade and other payables	0	0
Total non-current financial liabilities	85,304	99,839
Total financial liabilities	99,010	150,929
Financial liabilities recognized at amortized cost
Categories of current financial liabilities
Borrowings	1,172,624	1,165,985
Debt securities	6,788,824	7,957,300
Derivative liabilities	0	0
Trade and other payables	6,405,395	5,999,521
Total current financial liabilities	14,366,843	15,122,806
Categories of non-current financial liabilities
Borrowings	3,258,015	2,434,624
Debt securities	49,815,164	43,189,483
Derivative liabilities	0	0
Trade and other payables	2,941,696	3,223,480
Total non-current financial liabilities	56,014,875	48,847,587
Total financial liabilities	70,381,718	63,970,393
Derivative liabilities (using hedge accounting)
Categories of current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	6,725	20,177
Trade and other payables	0	0
Total current financial liabilities	6,725	20,177
Categories of non-current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	206,428	256,953
Trade and other payables	0	0
Total non-current financial liabilities	206,428	256,953
Total financial liabilities	₩ 213,153	₩ 277,130

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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 current debt instruments issued. [Refer: Debt instruments issued]

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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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