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Consolidated Statements of Operations - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Profit or loss [abstract]      
Operating revenue ₩ 24,899,189 ₩ 23,436,050 ₩ 23,546,929
Revenue 24,639,758 23,220,052 23,259,541
Others 259,431 215,998 287,388
Operating expenses 23,879,015 22,335,190 22,477,837
Operating profit 1,020,174 1,100,860 1,069,092
Finance income 424,395 374,243 406,328
Finance costs (421,931) (435,659) (644,531)
Share of net profits of associates and joint venture (3,304) (5,467) (13,892)
Profit before income tax 1,019,334 1,033,977 816,997
Income tax expense 320,060 314,565 270,656
Profit for the year 699,274 719,412 546,341
Profit for the year attributable to:      
Profit (loss) for the year attributable to Owners of the Controlling Company 649,109 645,571 461,559
Profit (loss) for the year attributable to Non-controlling interest ₩ 50,165 ₩ 73,841 ₩ 84,782
Earnings per share attributable to the equity holders of the Controlling Company during the year (in Korean won):      
Basic earnings per share ₩ 2,648 ₩ 2,634 ₩ 1,884
Diluted earnings per share ₩ 2,646 ₩ 2,634 ₩ 1,883