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Deferred Income Tax and Income Tax Expense - Summary of Tax Impacts Recognized Directly To Equity (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets and liabilities [abstract]      
Available-for-sale valuation gain(loss), Before recognition ₩ (5,561) ₩ 9,347 ₩ (47,515)
Hedge instruments valuation gain(loss), Before recognition 40,694 (14,611) 18,406
Remeasurements from net defined benefit liabilities, Before recognition (110,768) 5,558 (49,963)
Shares of gain(loss) of associates and joint ventures, Before recognition 13,410 (641) (5,297)
Foreign currency translation adjustment (27,865) (7,133) (6,443)
Total, Before recognition (90,090) (7,480) (90,812)
Available-for-sale valuation gain(loss), Tax effect 1,346 (2,262) 11,499
Hedge instruments valuation gain(loss), Tax effect (9,848) 3,536 (4,454)
Remeasurements from net defined benefit liabilities, Tax effect 26,806 (1,345) 12,091
Shares of gain(loss) of associates and joint ventures, Tax effect (3,245) 155 1,282
Foreign currency translation adjustment 6,743 1,726 1,559
Total, Tax effect 21,802 1,810 21,977
Available-for-sale valuation gain(loss), After recognition (4,215) 7,085 (36,016)
Hedge instruments valuation gain(loss), After recognition 30,846 (11,075) 13,952
Remeasurements from net defined benefit liabilities, After recognition (83,962) 4,213 (37,872)
Shares of gain(loss) of associates and joint ventures, After recognition 10,165 (486) (4,015)
Foreign currency translation adjustment (21,122) (5,407) (4,884)
Total other comprehensive loss ₩ (68,288) ₩ (5,670) ₩ (68,835)