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Consolidated Statements of Operations - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Profit or loss [abstract]      
Operating revenue ₩ 23,436,050 ₩ 23,546,929 ₩ 23,164,202
Revenue 23,220,052 23,259,541 22,798,330
Others 215,998 287,388 365,872
Operating expenses 22,335,190 22,477,837 21,781,098
Operating profit 1,100,860 1,069,092 1,383,104
Finance income 374,243 406,328 296,139
Finance costs (435,659) (644,531) (515,087)
Share of net profit (losses) of associates and joint venture (5,467) (13,892) 2,599
Profit before income tax 1,033,977 816,997 1,166,755
Income tax expense 314,565 270,656 334,910
Profit for the year 719,412 546,341 831,845
Profit for the year attributable to:      
Profit (loss) for the year attributable to Owners of the Controlling Company 645,571 461,559 745,090
Profit (loss) for the year attributable to Non-controlling interest ₩ 73,841 ₩ 84,782 ₩ 86,755
Earnings per share attributable to the equity holders of the Controlling Company during the year (in Korean won):      
Basic earnings per share ₩ 2,634 ₩ 1,884 ₩ 3,043
Diluted earnings per share ₩ 2,634 ₩ 1,883 ₩ 3,041