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Consolidated Statements of Comprehensive Income - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of comprehensive income [abstract]      
Profit for the year ₩ 719,412 ₩ 546,341 ₩ 831,845
Other comprehensive income Items that will not be reclassified to profit or loss:      
Remeasurements of the net defined benefit liability (73,511) (83,962) 4,213
Shares of remeasurement gain (loss) of associates and joint ventures (816) (115) 116
Gain on valuation of equity instruments at fair value through other comprehensive income 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 734    
Changes in value of available-for-sale financial assets   51,235 10,925
Other comprehensive income from available-for sale financial assets reclassified to loss   (55,450) (3,840)
Valuation gain (loss) on cash flow hedge 17,268 (111,083) 64,796
Other comprehensive income (loss) from cash flow hedges reclassified to profit (loss) (44,279) 141,929 (75,871)
Share of other comprehensive income (loss) from associates and joint ventures (41) 10,280 (602)
Exchange differences on translation of foreign operations 2,940 (21,122) (5,407)
Total other comprehensive loss (54,628) (68,288) (5,670)
Total comprehensive income for the year 664,784 478,053 826,175
Total comprehensive income for the year attributable to:      
Owners of the Controlling Company 589,179 413,149 738,413
Non-controlling interest 75,605 64,904 87,762
Total comprehensive income for the year ₩ 664,784 ₩ 478,053 ₩ 826,175