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Consolidated Statements of Comprehensive Income - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of comprehensive income [abstract]      
Profit for the year ₩ 546,341 ₩ 795,117 ₩ 624,685
Other comprehensive income Items that will not be reclassified to profit or loss:      
Remeasurements of the net defined benefit liability (83,962) 4,213 (37,872)
Shares of remeasurement gain (loss) of associates and joint ventures (115) 116 (2,407)
Other comprehensive income, Items that may be subsequently reclassified to profit or loss:      
Changes in value of available-for-sale financial assets 51,235 10,925 47,381
Other comprehensive income from available-for sale financial assets reclassified to loss (55,450) (3,840) (83,397)
Net gain (loss) on cash flow hedges (111,083) 64,796 111,914
Other comprehensive income (loss) from cash flow hedges reclassified to gain (loss) 141,929 (75,871) (97,962)
Shares of other comprehensive income (loss) from associates and joint ventures 10,280 (602) (1,608)
Exchange differences on translation of foreign operations (21,122) (5,407) (4,884)
Total other comprehensive loss (68,288) (5,670) (68,835)
Total comprehensive income for the year 478,053 789,447 555,850
Total comprehensive income for the year attributable to:      
Owners of the Controlling Company 413,149 701,685 495,139
Non-controlling interest 64,904 87,762 60,711
Total comprehensive income for the year ₩ 478,053 ₩ 789,447 ₩ 555,850