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Consolidated Statements of Comprehensive Income - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of comprehensive income [abstract]      
Profit for the year ₩ 746,256 ₩ 695,868 ₩ 719,412
Other comprehensive income Items that will not be reclassified to profit or loss:      
Remeasurements of the net defined benefit liability (60,181) (25,777) (73,511)
Shares of remeasurement gain (loss) of associates and joint ventures 786 649 (816)
Gain on valuation of equity instruments at fair value through other comprehensive income 51,696 155,319 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 (9,699) 11,833 734
Valuation gain (loss) on cash flow hedge (84,044) 67,548 17,268
Other comprehensive income (loss) from cash flow hedges reclassified to profit (loss) 111,431 (44,684) (44,279)
Share of other comprehensive income (loss) from associates and joint ventures 15,932 2,517 (41)
Exchange differences on translation of foreign operations (2,666) 4,933 2,940
Total other comprehensive income (loss) 23,255 172,338 (54,628)
Total comprehensive income for the year 769,511 868,206 664,784
Total comprehensive income for the year attributable to:      
Owners of the Controlling Company 727,077 768,341 589,179
Non-controlling interest ₩ 42,434 ₩ 99,865 ₩ 75,605