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Fair Value - Summary of Carrying Amount and Fair Value of Financial Instruments by Category (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 10,844,722	₩ 10,387,651
Financial liabilities	15,334,068	15,297,610
Trade and other payables [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	8,521,379	8,427,457
Borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	6,648,293	6,683,662
Financial Liabilities At Amortized Costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	99,330	87,670
Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	7,758	5,051
Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	57,308	93,770
Cash and cash equivalents [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,703,422	1,928,182
Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	5,425,996	6,793,397
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,097,348
Other financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	484,271	1,333,368
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	777,685	5,913
Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	326,157
Available-for-sale [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets		319,402
Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	29,843	7,389
Fair value [member] | Borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities		6,738,326
Fair value [member] | Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	7,758	5,051
Fair value [member] | Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	57,308	93,770
Fair value [member] | Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,097,348
Fair value [member] | Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	777,685	5,913
Fair value [member] | Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	326,157
Fair value [member] | Available-for-sale [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets		319,402
Fair value [member] | Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 29,843	₩ 7,389

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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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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