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Maximum exposure to credit risk (Details) - KRW (₩) ₩ in Millions		Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		₩ 1,358,345	₩ 2,369,739
Not Designated as Hedging Instrument
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		37,631	22,020
Financial assets at fair value through other comprehensive income
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		399,495
Designated as Hedging Instrument
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		64,704	10,606
Available-for-sale financial assets
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk			699,833
Financial assets at amortized cost
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		14,042
Held-to-maturity investments
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk			3,144
Loans and receivables
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		718,674	905,641
Long-term/short-term financial instruments
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		2,318,027	2,244,514
Financial assets at fair value through profit or loss
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		920,935	111,512
Trade and other receivables
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk		9,613,437	9,683,769
Provisions for financial guarantee
Disclosure of detailed information about financial instruments [Line Items]
Maximum exposure to credit risk	[1]	₩ 1,310,817	₩ 1,154,862
[1] Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation.

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The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2018-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name IFRS
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