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Consolidated Statements of Comprehensive Income - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of comprehensive income [abstract]      
Profit for the year ₩ 699,274 ₩ 719,412 ₩ 546,341
Other comprehensive income Items that will not be reclassified to profit or loss:      
Remeasurements of the net defined benefit liability (25,777) (73,511) (83,962)
Shares of remeasurement gain (loss) of associates and joint ventures 649 (816) (115)
Gain on valuation of equity instruments at fair value through other comprehensive income 155,319 43,077  
Other comprehensive income, Items that may be subsequently reclassified to profit or loss:      
Gain on valuation of debt instruments at fair value through other comprehensive income 11,833 734  
Changes in value of available-for-sale financial assets     51,235
Other comprehensive income from available-for sale financial assets reclassified to loss     (55,450)
Valuation gain (loss) on cash flow hedge 67,548 17,268 (111,083)
Other comprehensive income (loss) from cash flow hedges reclassified to profit (loss) (44,684) (44,279) 141,929
Share of other comprehensive income (loss) from associates and joint ventures 2,517 (41) 10,280
Exchange differences on translation of foreign operations 4,933 2,940 (21,122)
Total other comprehensive income (loss) 172,338 (54,628) (68,288)
Total comprehensive income for the year 871,612 664,784 478,053
Total comprehensive income for the year attributable to:      
Owners of the Controlling Company 771,747 589,179 413,149
Non-controlling interest ₩ 99,865 ₩ 75,605 ₩ 64,904