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Explanation of initial application of IFRS 9 (Details)
₩ in Millions
Dec. 31, 2017
KRW (₩)
Disclosure of Explanation of initial application of IFRS 9 [Line Items]  
Amount based on IFRS 9 ₩ 16,018,152
Amount based on IAS 39 16,018,152
Financial assets at FVTPL [Member] | FVTPL [Member]  
Disclosure of Explanation of initial application of IFRS 9 [Line Items]  
Amount based on IFRS 9 111,512
Amount based on IAS 39 111,512
Loans and receivables [Member]  
Disclosure of Explanation of initial application of IFRS 9 [Line Items]  
Amount based on IAS 39 15,203,663
Loans and receivables [Member] | Amortized cost [Member]  
Disclosure of Explanation of initial application of IFRS 9 [Line Items]  
Amount based on IFRS 9 14,412,339
Loans and receivables [Member] | FVTPL [Member]  
Disclosure of Explanation of initial application of IFRS 9 [Line Items]  
Amount based on IFRS 9 791,324
Available-for-sale financial assets [Member]  
Disclosure of Explanation of initial application of IFRS 9 [Line Items]  
Amount based on IAS 39 699,833
Available-for-sale financial assets [Member] | FVOCI [Member]  
Disclosure of Explanation of initial application of IFRS 9 [Line Items]  
Amount based on IFRS 9 476,941
Available-for-sale financial assets [Member] | FVTPL [Member]  
Disclosure of Explanation of initial application of IFRS 9 [Line Items]  
Amount based on IFRS 9 222,892
Held-to-maturity investments [Member] | Amortized cost [Member]  
Disclosure of Explanation of initial application of IFRS 9 [Line Items]  
Amount based on IFRS 9 3,144
Amount based on IAS 39 ₩ 3,144