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Classification of Financial Instruments - Classification of financial liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Categories of current financial liabilities
Borrowings	₩ 2,113,181	₩ 1,315,134
Debt securities	8,561,624	7,542,705
Derivative liabilities	49,884	73,064
Trade and other payables	6,256,521	6,649,402
Total current financial liabilities	16,981,210	15,580,305
Categories of non-current financial liabilities
Borrowings	3,003,999	3,389,743
Debt securities	56,045,777	55,628,959
Derivative liabilities	315,235	96,896
Trade and other payables	6,480,412	6,965,760
Total non-current financial liabilities	65,845,423	66,081,358
Total financial liabilities	82,826,633	81,661,663
Financial liabilities at fair value through profit or loss
Categories of current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	13,053	13,286
Trade and other payables	0	0
Total current financial liabilities	13,053	13,286
Categories of non-current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	144,873	39,861
Trade and other payables	0	0
Total non-current financial liabilities	144,873	39,861
Total financial liabilities	157,926	53,147
Financial liabilities recognized at amortized cost
Categories of current financial liabilities
Borrowings	2,113,181	1,315,134
Debt securities	8,561,624	7,542,705
Derivative liabilities	0	0
Trade and other payables	6,256,521	6,649,402
Total current financial liabilities	16,931,326	15,507,241
Categories of non-current financial liabilities
Borrowings	3,003,999	3,389,743
Debt securities	56,045,777	55,628,959
Derivative liabilities	0	0
Trade and other payables	6,480,412	6,965,760
Total non-current financial liabilities	65,530,188	65,984,462
Total financial liabilities	82,461,514	81,491,703
Derivative liabilities (using hedge accounting)
Categories of current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	36,831	59,778
Trade and other payables	0	0
Total current financial liabilities	36,831	59,778
Categories of non-current financial liabilities
Borrowings	0	0
Debt securities	0	0
Derivative liabilities	170,362	57,035
Trade and other payables	0	0
Total non-current financial liabilities	170,362	57,035
Total financial liabilities	₩ 207,193	₩ 116,813

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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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