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Maturity analysis for non-derivative financial assets (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items] |  |  |  |  |
Cash and cash equivalents |  | ₩ 1,358,345 | ₩ 2,369,739 | ₩ 3,051,353 | ₩ 3,783,065
Available-for-sale financial assets |  |  | 699,833 | 1,014,732 |
Equity investment at fair value through other comprehensive income |  | 399,495 |  |  |
Held-to-maturity investments |  |  | 3,144 | ₩ 3,244 |
Financial assets at amortised cost |  | 14,042 |  |  |
Loans and receivables |  | 758,378 | 946,430 |  |
Long-term/short-term financial instruments |  | 2,318,027 | 2,244,514 |  |
Financial assets at fair value through profit or loss |  | 920,935 | 111,512 |  |
Trade and other receivables |  | 9,622,813 | 9,692,080 |  |
Financial assets held for managing liquidity risk |  | 15,392,035 | 16,067,252 |  |
Less than 1 year |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 1,358,345 | 2,369,739 |  |
Available-for-sale financial assets |  |  | 0 |  |
Equity investment at fair value through other comprehensive income |  | 0 |  |  |
Held-to-maturity investments |  |  | 5 |  |
Financial assets at amortised cost |  | 11,956 |  |  |
Loans and receivables |  | 123,646 | 244,309 |  |
Long-term/short-term financial instruments |  | 1,869,286 | 1,702,084 |  |
Financial assets at fair value through profit or loss |  | 313,893 | 0 |  |
Trade and other receivables |  | 7,795,619 | 7,930,715 |  |
Financial assets held for managing liquidity risk |  | 11,472,745 | 12,246,852 |  |
1~5 Years |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 0 | 0 |  |
Available-for-sale financial assets |  |  | 0 |  |
Equity investment at fair value through other comprehensive income |  | 0 |  |  |
Held-to-maturity investments |  |  | 3,139 |  |
Financial assets at amortised cost |  | 2,086 |  |  |
Loans and receivables |  | 314,744 | 261,672 |  |
Long-term/short-term financial instruments |  | 278,899 | 201,821 |  |
Financial assets at fair value through profit or loss |  | 81,828 | 0 |  |
Trade and other receivables |  | 1,067,800 | 920,539 |  |
Financial assets held for managing liquidity risk |  | 1,745,357 | 1,387,171 |  |
More than 5 years |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 0 | 0 |  |
Available-for-sale financial assets |  |  | 214,156 |  |
Equity investment at fair value through other comprehensive income |  | 0 |  |  |
Held-to-maturity investments |  |  | 0 |  |
Financial assets at amortised cost |  | 0 |  |  |
Loans and receivables |  | 319,988 | 429,628 |  |
Long-term/short-term financial instruments |  | 164,057 | 340,304 |  |
Financial assets at fair value through profit or loss |  | 483,398 | 111,512 |  |
Trade and other receivables |  | 701,743 | 788,795 |  |
Financial assets held for managing liquidity risk |  | 1,669,186 | 1,884,395 |  |
Other |  |  |  |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items] |  |  |  |  |
Cash and cash equivalents | [1] | 0 | 0 |  |
Available-for-sale financial assets | [1] |  | 485,677 |  |
Equity investment at fair value through other comprehensive income | [1] | 399,495 |  |  |
Held-to-maturity investments | [1] |  | 0 |  |
Financial assets at amortised cost | [1] | 0 |  |  |
Loans and receivables | [1] | 0 | 10,821 |  |
Long-term/short-term financial instruments | [1] | 5,785 | 305 |  |
Financial assets at fair value through profit or loss | [1] | 41,816 | 0 |  |
Trade and other receivables | [1] | 57,651 | 52,031 |  |
Financial assets held for managing liquidity risk | [1] | ₩ 504,747 | ₩ 548,834 |  |
[1] | The maturities cannot be presently determined.

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_f&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial assets that are measured at fair value through other comprehensive income. A financial asset shall be measured at fair value through other comprehensive income if both of the following conditions are met: (a) the financial asset is held within a business model whose objective is achieved by both collecting contractual cash flows and selling financial assets and (b) the contractual terms of the financial asset give rise on specified dates to cash flows that are solely payments of principal and interest on the principal amount outstanding. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_h&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of non-derivative financial assets with fixed or determinable payments and fixed maturity that an entity has the positive intention and ability to hold to maturity other than: (a) those that the entity upon initial recognition designates as at fair value through profit or loss; (b) those that the entity designates as available for sale; and (c) those that meet the definition of loans and receivables. An entity shall not classify any financial assets as held to maturity if the entity has, during the current financial year or during the two preceding financial years, sold or reclassified more than an insignificant amount of held-to-maturity investments before maturity (more than insignificant in relation to the total amount of held-to-maturity investments) other than sales or reclassifications that: (i) are so close to maturity or the financial asset’s call date (for example, less than three months before maturity) that changes in the market rate of interest would not have a significant effect on the financial asset’s fair value; (ii) occur after the entity has collected substantially all of the financial asset’s original principal through scheduled payments or prepayments; or (iii) are attributable to an isolated event that is beyond the entity’s control, is non-recurring and could not have been reasonably anticipated by the entity. [Refer: Derivative financial assets; Held-to-maturity investments; Prepayments] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_b&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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