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Consolidated Statements of Operations - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Profit or loss [abstract]      
Operating revenue ₩ 23,546,929 ₩ 23,120,878 ₩ 22,699,856
Revenue 23,259,541 22,755,006 22,211,673
Others 287,388 365,872 488,183
Operating expenses 22,477,837 21,781,098 21,622,788
Operating profit 1,069,092 1,339,780 1,077,068
Finance income 406,328 296,139 272,860
Finance costs (644,531) (515,087) (645,331)
Share of net profits of associates and joint venture (13,892) 2,599 6,144
Profit from continuing operations before income tax 816,997 1,123,431 710,741
Income tax expense 270,656 328,314 227,131
Profit from continuing operations 546,341 795,117 483,610
Profit from discontinued operations     141,075
Profit for the year 546,341 795,117 624,685
Profit for the year attributable to:      
Profit (loss) for the year attributable to Owners of the Controlling Company 461,559 708,362 546,361
Profit from continuing operations 461,559 708,362 404,045
Profit from discontinued operations     142,316
Profit (loss) for the year attributable to Non-controlling interest 84,782 86,755 78,324
Profit from continuing operations 84,782 86,755 79,565
Loss from discontinued operations     (1,241)
Profit for the year ₩ 546,341 ₩ 795,117 ₩ 624,685
Earnings per share attributable to the equity holders of the Controlling Company during the year (in Korean won):      
Basic earnings per share ₩ 1,884 ₩ 2,893 ₩ 2,231
From continuing operations 1,884 2,893 1,650
From discontinued operations     581
Diluted earnings per share 1,883 2,891 2,231
From continuing operations ₩ 1,883 ₩ 2,891 1,650
From discontinued operations     ₩ 581