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Consolidated Statements of Operations - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Profit or loss [abstract]      
Operating revenue ₩ 24,440,647 ₩ 24,899,189 ₩ 23,436,050
Revenue 24,099,394 24,639,758 23,220,052
Others 341,253 259,431 215,998
Operating expenses 23,418,314 23,872,219 22,335,190
Operating profit 1,022,333 1,026,970 1,100,860
Finance income 498,614 424,395 374,243
Finance costs (507,383) (432,133) (435,659)
Share of net profits of associates and joint ventures 18,041 (3,304) (5,467)
Profit before income tax 1,031,605 1,015,928 1,033,977
Income tax expense 285,349 320,060 314,565
Profit for the year 746,256 695,868 719,412
Profit for the year attributable to:      
Profit (loss) for the year attributable to Owners of the Controlling Company 700,889 645,703 645,571
Profit (loss) for the year attributable to Non-controlling interest ₩ 45,367 ₩ 50,165 ₩ 73,841
Earnings per share attributable to the equity holders of the Controlling Company during the year (in Korean won):      
Basic earnings per share ₩ 2,858 ₩ 2,634 ₩ 2,634
Diluted earnings per share ₩ 2,858 ₩ 2,632 ₩ 2,634