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Income tax expense : Reconciliation between actual income tax expense and amount computed by applying the statutory tax rate of 24.2% to income before income taxes (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure - Income tax expense calculated by multiplying net income before tax with the tax rate [Abstract]      
Profit before income tax ₩ 3,614,218 ₩ 10,513,468 ₩ 18,655,786
Income tax expense computed at applicable tax rate of 24.2% 874,641 2,544,259 4,514,700
Adjustments 1,293,699 589,769 747,961
Effect of applying gradual tax rate (5,082) (5,082) (4,147)
Effect of non-taxable income (32,032) (29,554) (8,047)
Effect of non-deductible expenses 15,032 22,258 17,734
Effects of tax credits and deduction (161,069) (194,731) (103,435)
Recognition (reversal) of unrecognized deferred tax asset, net 44,573 (86,845) 71,999
Effect of change in deferred tax due to change in tax rate (from 24.2% to 27.5%) 1,055,154    
Deferred income tax related to investments in subsidiaries and associates 394,145 862,956 784,793
Others, net (17,022) 20,767 (10,936)
Adjustment in respect of prior years due to change in estimate 4,484 231,113 (23,248)
Income tax expense ₩ 2,172,824 ₩ 3,365,141 ₩ 5,239,413
Effective tax rate 60.00% 32.00% 28.00%