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Classification of Financial Instruments - Classification of financial liabilities (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Categories of current financial liabilities [Abstract]
Borrowings	₩ 1,165,985	₩ 1,115,521
Debt securities	7,957,300	7,823,557
Derivative liabilities	71,267	3,251
Trade and other payables	5,999,521	5,585,411
Total current financial liabilities	15,194,073	14,527,740
Categories of non-current financial liabilities [Abstract]
Borrowings	2,434,624	1,773,891
Debt securities	43,189,483	42,926,236
Derivative liabilities	356,792	135,435
Trade and other payables	3,223,480	3,558,175
Total non-current financial liabilities	49,204,379	48,393,737
Total financial liabilities	64,398,452	62,921,477
Financial liabilities at fair value through profit or loss [Member]
Categories of current financial liabilities [Abstract]
Derivative liabilities	51,090	3,251
Total current financial liabilities	51,090	3,251
Categories of non-current financial liabilities [Abstract]
Derivative liabilities	99,839	18,278
Total non-current financial liabilities	99,839	18,278
Total financial liabilities	150,929	21,529
Financial liabilities recognized at amortized cost [Member]
Categories of current financial liabilities [Abstract]
Borrowings	1,165,985	1,115,521
Debt securities	7,957,300	7,823,557
Trade and other payables	5,999,521	5,585,411
Total current financial liabilities	15,122,806	14,524,489
Categories of non-current financial liabilities [Abstract]
Borrowings	2,434,624	1,773,891
Debt securities	43,189,483	42,926,236
Trade and other payables	3,223,480	3,558,175
Total non-current financial liabilities	48,847,587	48,258,302
Total financial liabilities	63,970,393	62,782,791
Derivative liabilities (using hedge accounting) [Member]
Categories of current financial liabilities [Abstract]
Derivative liabilities	20,177
Total current financial liabilities	20,177
Categories of non-current financial liabilities [Abstract]
Derivative liabilities	256,953	117,157
Total non-current financial liabilities	256,953	117,157
Total financial liabilities	₩ 277,130	₩ 117,157

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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 current derivative financial liabilities. [Refer: Derivative financial liabilities]

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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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