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Derivative Currency swap forward contract List (Details) - 12 months ended Dec. 31, 2017
¥ in Thousands, $ in Thousands, ₩ in Millions
KRW (₩)
JPY (¥)
USD ($)
Currency forward contracts 1 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty KEB Hana Bank KEB Hana Bank KEB Hana Bank
Contract date Apr. 10, 2014 Apr. 10, 2014 Apr. 10, 2014
Matrurity date Jul. 12, 2021 Jul. 12, 2021 Jul. 12, 2021
Contract Amount Pay ₩ 55,120    
Contract Amount Receive | $     $ 52,000
Contract exchange rate 1,060.00 1,060.00 1,060.00
Currency forward contracts 2 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty KEB Hana Bank KEB Hana Bank KEB Hana Bank
Contract date Apr. 28, 2014 Apr. 28, 2014 Apr. 28, 2014
Matrurity date Jul. 12, 2021 Jul. 12, 2021 Jul. 12, 2021
Contract Amount Pay ₩ 50,784    
Contract Amount Receive | $     $ 48,000
Contract exchange rate 1,058.00 1,058.00 1,058.00
Currency forward contracts 3 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Bank of America Bank of America Bank of America
Contract date Apr. 29, 2014 Apr. 29, 2014 Apr. 29, 2014
Matrurity date Jul. 12, 2021 Jul. 12, 2021 Jul. 12, 2021
Contract Amount Pay ₩ 105,400    
Contract Amount Receive | $     $ 100,000
Contract exchange rate 1,054.00 1,054.00 1,054.00
Currency forward contracts 4 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty KEB Hana Bank KEB Hana Bank KEB Hana Bank
Contract date May 09, 2014 May 09, 2014 May 09, 2014
Matrurity date Jul. 12, 2021 Jul. 12, 2021 Jul. 12, 2021
Contract Amount Pay ₩ 104,600    
Contract Amount Receive | $     $ 100,000
Contract exchange rate 1,046.00 1,046.00 1,046.00
Currency forward contracts 5 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty KEB Hana Bank KEB Hana Bank KEB Hana Bank
Contract date Dec. 22, 2017 Dec. 22, 2017 Dec. 22, 2017
Matrurity date Jul. 12, 2021 Jul. 12, 2021 Jul. 12, 2021
Contract Amount Pay ₩ 105,079    
Contract Amount Receive | $     $ 100,000
Contract exchange rate 1,050.79 1,050.79 1,050.79
Currency forward contracts 6 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Korea Development Bank Korea Development Bank Korea Development Bank
Contract date Dec. 27, 2017 Dec. 27, 2017 Dec. 27, 2017
Matrurity date Jul. 12, 2021 Jul. 12, 2021 Jul. 12, 2021
Contract Amount Pay ₩ 104,849    
Contract Amount Receive | $     $ 100,000
Contract exchange rate 1,048.49 1,048.49 1,048.49
Currency forward contracts 7 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty CCB CCB CCB
Contract date Dec. 07, 2017 Dec. 07, 2017 Dec. 07, 2017
Matrurity date Jan. 11, 2018 Jan. 11, 2018 Jan. 11, 2018
Contract Amount Pay ₩ 10,921    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,092.14 1,092.14 1,092.14
Currency forward contracts 8 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Morgan Stanley Morgan Stanley Morgan Stanley
Contract date Nov. 27, 2017 Nov. 27, 2017 Nov. 27, 2017
Matrurity date Jan. 03, 2018 Jan. 03, 2018 Jan. 03, 2018
Contract Amount Pay ₩ 5,439    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,087.70 1,087.70 1,087.70
Currency forward contracts 9 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Mizuho Bank Mizuho Bank Mizuho Bank
Contract date Nov. 29, 2017 Nov. 29, 2017 Nov. 29, 2017
Matrurity date Jan. 05, 2018 Jan. 05, 2018 Jan. 05, 2018
Contract Amount Pay ₩ 5,402    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,080.32 1,080.32 1,080.32
Currency forward contracts 10 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty KEB Hana Bank KEB Hana Bank KEB Hana Bank
Contract date Nov. 30, 2017 Nov. 30, 2017 Nov. 30, 2017
Matrurity date Jan. 08, 2018 Jan. 08, 2018 Jan. 08, 2018
Contract Amount Pay ₩ 5,437    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,087.35 1,087.35 1,087.35
Currency forward contracts 11 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Mizuho Bank Mizuho Bank Mizuho Bank
Contract date Dec. 05, 2017 Dec. 05, 2017 Dec. 05, 2017
Matrurity date Jan. 09, 2018 Jan. 09, 2018 Jan. 09, 2018
Contract Amount Pay ₩ 5,416    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,083.20 1,083.20 1,083.20
Currency forward contracts 12 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 11, 2017 Dec. 11, 2017 Dec. 11, 2017
Matrurity date Jan. 12, 2018 Jan. 12, 2018 Jan. 12, 2018
Contract Amount Pay ₩ 10,922    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,092.20 1,092.20 1,092.20
Currency forward contracts 13 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Kookmin Bank Kookmin Bank Kookmin Bank
Contract date Dec. 12, 2017 Dec. 12, 2017 Dec. 12, 2017
Matrurity date Jan. 15, 2018 Jan. 15, 2018 Jan. 15, 2018
Contract Amount Pay ₩ 3,270    
Contract Amount Receive | $     $ 3,000
Contract exchange rate 1,090.15 1,090.15 1,090.15
Currency forward contracts 14 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Kookmin Bank Kookmin Bank Kookmin Bank
Contract date Dec. 13, 2017 Dec. 13, 2017 Dec. 13, 2017
Matrurity date Jan. 16, 2018 Jan. 16, 2018 Jan. 16, 2018
Contract Amount Pay ₩ 10,906    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,090.55 1,090.55 1,090.55
Currency forward contracts 15 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Credit Suisse Credit Suisse Credit Suisse
Contract date Dec. 14, 2017 Dec. 14, 2017 Dec. 14, 2017
Matrurity date Jan. 17, 2018 Jan. 17, 2018 Jan. 17, 2018
Contract Amount Pay ₩ 10,858    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,085.80 1,085.80 1,085.80
Currency forward contracts 16 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Standard Chartered Standard Chartered Standard Chartered
Contract date Dec. 14, 2017 Dec. 14, 2017 Dec. 14, 2017
Matrurity date Jan. 18, 2018 Jan. 18, 2018 Jan. 18, 2018
Contract Amount Pay ₩ 10,858    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,085.80 1,085.80 1,085.80
Currency forward contracts 17 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Morgan Stanley Morgan Stanley Morgan Stanley
Contract date Dec. 15, 2017 Dec. 15, 2017 Dec. 15, 2017
Matrurity date Jan. 19, 2018 Jan. 19, 2018 Jan. 19, 2018
Contract Amount Pay ₩ 10,884    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,088.39 1,088.39 1,088.39
Currency forward contracts 18 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 18, 2017 Dec. 18, 2017 Dec. 18, 2017
Matrurity date Jan. 22, 2018 Jan. 22, 2018 Jan. 22, 2018
Contract Amount Pay ₩ 10,881    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,088.14 1,088.14 1,088.14
Currency forward contracts 19 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Standard Chartered Standard Chartered Standard Chartered
Contract date Dec. 20, 2017 Dec. 20, 2017 Dec. 20, 2017
Matrurity date Jan. 22, 2018 Jan. 22, 2018 Jan. 22, 2018
Contract Amount Pay ₩ 5,413    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,082.60 1,082.60 1,082.60
Currency forward contracts 20 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Mizuho Bank Mizuho Bank Mizuho Bank
Contract date Dec. 21, 2017 Dec. 21, 2017 Dec. 21, 2017
Matrurity date Jan. 26, 2018 Jan. 26, 2018 Jan. 26, 2018
Contract Amount Pay ₩ 10,802    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,080.20 1,080.20 1,080.20
Currency forward contracts 21 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Credit Suisse Credit Suisse Credit Suisse
Contract date Dec. 22, 2017 Dec. 22, 2017 Dec. 22, 2017
Matrurity date Jan. 26, 2018 Jan. 26, 2018 Jan. 26, 2018
Contract Amount Pay ₩ 10,778    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,077.75 1,077.75 1,077.75
Currency forward contracts 22 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty KEB Hana Bank KEB Hana Bank KEB Hana Bank
Contract date Dec. 28, 2017 Dec. 28, 2017 Dec. 28, 2017
Matrurity date Jan. 29, 2018 Jan. 29, 2018 Jan. 29, 2018
Contract Amount Pay ₩ 10,716    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,071.55 1,071.55 1,071.55
Currency forward contracts 23 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty CCB CCB CCB
Contract date Dec. 28, 2017 Dec. 28, 2017 Dec. 28, 2017
Matrurity date Jan. 30, 2018 Jan. 30, 2018 Jan. 30, 2018
Contract Amount Pay ₩ 10,706    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,070.60 1,070.60 1,070.60
Currency forward contracts 24 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 29, 2017 Dec. 29, 2017 Dec. 29, 2017
Matrurity date Feb. 05, 2018 Feb. 05, 2018 Feb. 05, 2018
Contract Amount Pay ₩ 10,679    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,067.90 1,067.90 1,067.90
Currency forward contracts 25 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 05, 2017 Dec. 05, 2017 Dec. 05, 2017
Matrurity date Jan. 05, 2018 Jan. 05, 2018 Jan. 05, 2018
Contract Amount Pay ₩ 2,170    
Contract Amount Receive | $     $ 2,000
Contract exchange rate 1,084.92 1,084.92 1,084.92
Currency forward contracts 26 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 05, 2017 Dec. 05, 2017 Dec. 05, 2017
Matrurity date Jan. 05, 2018 Jan. 05, 2018 Jan. 05, 2018
Contract Amount Pay ₩ 2,164    
Contract Amount Receive | $     $ 2,000
Contract exchange rate 1,082.02 1,082.02 1,082.02
Currency forward contracts 27 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 07, 2017 Dec. 07, 2017 Dec. 07, 2017
Matrurity date Jan. 05, 2018 Jan. 05, 2018 Jan. 05, 2018
Contract Amount Pay ₩ 6,551    
Contract Amount Receive | $     $ 6,000
Contract exchange rate 1,091.77 1,091.77 1,091.77
Currency forward contracts 28 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Korea Development Bank Korea Development Bank Korea Development Bank
Contract date Dec. 14, 2017 Dec. 14, 2017 Dec. 14, 2017
Matrurity date Jan. 10, 2018 Jan. 10, 2018 Jan. 10, 2018
Contract Amount Pay ₩ 11,950    
Contract Amount Receive | $     $ 11,000
Contract exchange rate 1,086.35 1,086.35 1,086.35
Currency forward contracts 29 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Societe Generale Societe Generale Societe Generale
Contract date Dec. 14, 2017 Dec. 14, 2017 Dec. 14, 2017
Matrurity date Jan. 10, 2018 Jan. 10, 2018 Jan. 10, 2018
Contract Amount Pay ₩ 10,865    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,086.45 1,086.45 1,086.45
Currency forward contracts 30 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty BTMU BTMU BTMU
Contract date Dec. 20, 2017 Dec. 20, 2017 Dec. 20, 2017
Matrurity date Jan. 16, 2018 Jan. 16, 2018 Jan. 16, 2018
Contract Amount Pay ₩ 11,906    
Contract Amount Receive | $     $ 11,000
Contract exchange rate 1,082.35 1,082.35 1,082.35
Currency forward contracts 31 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Korea Development Bank Korea Development Bank Korea Development Bank
Contract date Dec. 20, 2017 Dec. 20, 2017 Dec. 20, 2017
Matrurity date Jan. 16, 2018 Jan. 16, 2018 Jan. 16, 2018
Contract Amount Pay ₩ 15,130    
Contract Amount Receive | $     $ 14,000
Contract exchange rate 1,080.70 1,080.70 1,080.70
Currency forward contracts 32 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty CCB CCB CCB
Contract date Dec. 21, 2017 Dec. 21, 2017 Dec. 21, 2017
Matrurity date Jan. 23, 2018 Jan. 23, 2018 Jan. 23, 2018
Contract Amount Pay ₩ 11,880    
Contract Amount Receive | $     $ 11,000
Contract exchange rate 1,080.00 1,080.00 1,080.00
Currency forward contracts 33 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Korea Development Bank Korea Development Bank Korea Development Bank
Contract date Dec. 28, 2017 Dec. 28, 2017 Dec. 28, 2017
Matrurity date Jan. 31, 2018 Jan. 31, 2018 Jan. 31, 2018
Contract Amount Pay ₩ 11,782    
Contract Amount Receive | $     $ 11,000
Contract exchange rate 1,071.10 1,071.10 1,071.10
Currency forward contracts 34 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 28, 2017 Dec. 28, 2017 Dec. 28, 2017
Matrurity date Jan. 23, 2018 Jan. 23, 2018 Jan. 23, 2018
Contract Amount Pay ₩ 33,209    
Contract Amount Receive | $     $ 31,000
Contract exchange rate 1,071.25 1,071.25 1,071.25
Currency forward contracts 35 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty KEB Hana Bank KEB Hana Bank KEB Hana Bank
Contract date Dec. 28, 2017 Dec. 28, 2017 Dec. 28, 2017
Matrurity date Jan. 23, 2018 Jan. 23, 2018 Jan. 23, 2018
Contract Amount Pay ₩ 10,712    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,071.15 1,071.15 1,071.15
Currency forward contracts 36 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty BTMU BTMU BTMU
Contract date Dec. 28, 2017 Dec. 28, 2017 Dec. 28, 2017
Matrurity date Jan. 31, 2018 Jan. 31, 2018 Jan. 31, 2018
Contract Amount Pay ₩ 10,712    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,071.20 1,071.20 1,071.20
Currency forward contracts 37 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty BNP Paribas BNP Paribas BNP Paribas
Contract date Nov. 15, 2017 Nov. 15, 2017 Nov. 15, 2017
Matrurity date Jan. 17, 2018 Jan. 17, 2018 Jan. 17, 2018
Contract Amount Pay ₩ 3,713    
Contract Amount Receive | $     $ 3,349
Contract exchange rate 1,108.60 1,108.60 1,108.60
Currency forward contracts 38 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Nov. 15, 2017 Nov. 15, 2017 Nov. 15, 2017
Matrurity date Jan. 22, 2018 Jan. 22, 2018 Jan. 22, 2018
Contract Amount Pay ₩ 8,837    
Contract Amount Receive | $     $ 8,000
Contract exchange rate 1,104.60 1,104.60 1,104.60
Currency forward contracts 39 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty BTMU BTMU BTMU
Contract date Nov. 29, 2017 Nov. 29, 2017 Nov. 29, 2017
Matrurity date Feb. 01, 2018 Feb. 01, 2018 Feb. 01, 2018
Contract Amount Pay ₩ 7,568    
Contract Amount Receive | $     $ 7,000
Contract exchange rate 1,081.20 1,081.20 1,081.20
Currency forward contracts 40 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty BNP Paribas BNP Paribas BNP Paribas
Contract date Nov. 29, 2017 Nov. 29, 2017 Nov. 29, 2017
Matrurity date Feb. 01, 2018 Feb. 01, 2018 Feb. 01, 2018
Contract Amount Pay ₩ 7,557    
Contract Amount Receive | $     $ 7,000
Contract exchange rate 1,079.60 1,079.60 1,079.60
Currency forward contracts 41 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Credit Agricole Credit Agricole Credit Agricole
Contract date Dec. 19, 2017 Dec. 19, 2017 Dec. 19, 2017
Matrurity date Jan. 22, 2018 Jan. 22, 2018 Jan. 22, 2018
Contract Amount Pay ₩ 5,429    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,085.75 1,085.75 1,085.75
Currency forward contracts 42 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty BTMU BTMU BTMU
Contract date Dec. 20, 2017 Dec. 20, 2017 Dec. 20, 2017
Matrurity date Feb. 22, 2018 Feb. 22, 2018 Feb. 22, 2018
Contract Amount Pay ₩ 10,822    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,082.18 1,082.18 1,082.18
Currency forward contracts 43 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty KEB Hana Bank KEB Hana Bank KEB Hana Bank
Contract date Dec. 20, 2017 Dec. 20, 2017 Dec. 20, 2017
Matrurity date Jan. 22, 2018 Jan. 22, 2018 Jan. 22, 2018
Contract Amount Pay ₩ 2,879    
Contract Amount Receive | $     $ 2,661
Contract exchange rate 1,082.00 1,082.00 1,082.00
Currency forward contracts 44 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty BNP Paribas BNP Paribas BNP Paribas
Contract date Dec. 20, 2017 Dec. 20, 2017 Dec. 20, 2017
Matrurity date Jan. 22, 2018 Jan. 22, 2018 Jan. 22, 2018
Contract Amount Pay ₩ 5,406    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,081.10 1,081.10 1,081.10
Currency forward contracts 45 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nonghyup Bank Nonghyup Bank Nonghyup Bank
Contract date Dec. 21, 2017 Dec. 21, 2017 Dec. 21, 2017
Matrurity date Jan. 23, 2018 Jan. 23, 2018 Jan. 23, 2018
Contract Amount Pay ₩ 6,467    
Contract Amount Receive | $     $ 6,000
Contract exchange rate 1,077.90 1,077.90 1,077.90
Currency forward contracts 46 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 27, 2017 Dec. 27, 2017 Dec. 27, 2017
Matrurity date Jan. 29, 2018 Jan. 29, 2018 Jan. 29, 2018
Contract Amount Pay ₩ 5,366    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,073.15 1,073.15 1,073.15
Currency forward contracts 47 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 27, 2017 Dec. 27, 2017 Dec. 27, 2017
Matrurity date Jan. 05, 2018 Jan. 05, 2018 Jan. 05, 2018
Contract Amount Pay ₩ 5,373    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,074.50 1,074.50 1,074.50
Currency forward contracts 48 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty KEB Hana Bank KEB Hana Bank KEB Hana Bank
Contract date Nov. 23, 2017 Nov. 23, 2017 Nov. 23, 2017
Matrurity date Jan. 11, 2018 Jan. 11, 2018 Jan. 11, 2018
Contract Amount Pay ₩ 9,237    
Contract Amount Receive | $     $ 8,500
Contract exchange rate 1,086.76 1,086.76 1,086.76
Currency forward contracts 49 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Standard Chartered Standard Chartered Standard Chartered
Contract date Dec. 13, 2017 Dec. 13, 2017 Dec. 13, 2017
Matrurity date Jan. 15, 2018 Jan. 15, 2018 Jan. 15, 2018
Contract Amount Pay ₩ 5,454    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,090.70 1,090.70 1,090.70
Currency forward contracts 50 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Standard Chartered Standard Chartered Standard Chartered
Contract date Dec. 08, 2017 Dec. 08, 2017 Dec. 08, 2017
Matrurity date Jan. 25, 2018 Jan. 25, 2018 Jan. 25, 2018
Contract Amount Pay ₩ 10,921    
Contract Amount Receive | $     $ 10,000
Contract exchange rate 1,092.05 1,092.05 1,092.05
Currency forward contracts 51 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Standard Chartered Standard Chartered Standard Chartered
Contract date Oct. 31, 2017 Oct. 31, 2017 Oct. 31, 2017
Matrurity date Feb. 21, 2018 Feb. 21, 2018 Feb. 21, 2018
Contract Amount Pay ₩ 5,610    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,122.00 1,122.00 1,122.00
Currency forward contracts 52 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Standard Chartered Standard Chartered Standard Chartered
Contract date Nov. 29, 2017 Nov. 29, 2017 Nov. 29, 2017
Matrurity date Feb. 21, 2018 Feb. 21, 2018 Feb. 21, 2018
Contract Amount Pay ₩ 7,572    
Contract Amount Receive | $     $ 7,000
Contract exchange rate 1,081.65 1,081.65 1,081.65
Currency forward contracts 53 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 20, 2017 Dec. 20, 2017 Dec. 20, 2017
Matrurity date Mar. 22, 2018 Mar. 22, 2018 Mar. 22, 2018
Contract Amount Pay ₩ 3,978    
Contract Amount Receive | $     $ 3,682
Contract exchange rate 1,080.55 1,080.55 1,080.55
Currency forward contracts 54 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 20, 2017 Dec. 20, 2017 Dec. 20, 2017
Matrurity date Mar. 22, 2018 Mar. 22, 2018 Mar. 22, 2018
Contract Amount Pay ₩ 5,399    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,079.75 1,079.75 1,079.75
Currency forward contracts 55 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 20, 2017 Dec. 20, 2017 Dec. 20, 2017
Matrurity date Mar. 22, 2018 Mar. 22, 2018 Mar. 22, 2018
Contract Amount Pay ₩ 5,393    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,078.55 1,078.55 1,078.55
Currency forward contracts 56 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia　 Nova Scotia　 Nova Scotia　
Contract date Dec. 20, 2017 Dec. 20, 2017 Dec. 20, 2017
Matrurity date Mar. 22, 2018 Mar. 22, 2018 Mar. 22, 2018
Contract Amount Pay ₩ 5,393    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,078.65 1,078.65 1,078.65
Currency forward contracts 57 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 14, 2017 Dec. 14, 2017 Dec. 14, 2017
Matrurity date Mar. 19, 2018 Mar. 19, 2018 Mar. 19, 2018
Contract Amount Pay ₩ 205    
Contract Amount Receive | $     $ 189
Contract exchange rate 1,084.50 1,084.50 1,084.50
Currency forward contracts 58 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Standard Chartered Standard Chartered Standard Chartered
Contract date Dec. 19, 2017 Dec. 19, 2017 Dec. 19, 2017
Matrurity date Mar. 21, 2018 Mar. 21, 2018 Mar. 21, 2018
Contract Amount Pay ₩ 3,164    
Contract Amount Receive | $     $ 2,918
Contract exchange rate 1,084.20 1,084.20 1,084.20
Currency forward contracts 59 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Societe Generale Societe Generale Societe Generale
Contract date Dec. 19, 2017 Dec. 19, 2017 Dec. 19, 2017
Matrurity date Mar. 21, 2018 Mar. 21, 2018 Mar. 21, 2018
Contract Amount Pay ₩ 1,177    
Contract Amount Receive | $     $ 1,087
Contract exchange rate 1,082.90 1,082.90 1,082.90
Currency forward contracts 60 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Societe Generale Societe Generale Societe Generale
Contract date Dec. 19, 2017 Dec. 19, 2017 Dec. 19, 2017
Matrurity date Mar. 21, 2018 Mar. 21, 2018 Mar. 21, 2018
Contract Amount Pay ₩ 5,418    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,083.60 1,083.60 1,083.60
Currency forward contracts 61 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Societe Generale Societe Generale Societe Generale
Contract date Dec. 19, 2017 Dec. 19, 2017 Dec. 19, 2017
Matrurity date Mar. 21, 2018 Mar. 21, 2018 Mar. 21, 2018
Contract Amount Pay ₩ 5,421    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,084.20 1,084.20 1,084.20
Currency forward contracts 62 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty BNP Paribas BNP Paribas BNP Paribas
Contract date Dec. 19, 2017 Dec. 19, 2017 Dec. 19, 2017
Matrurity date Mar. 21, 2018 Mar. 21, 2018 Mar. 21, 2018
Contract Amount Pay ₩ 5,413    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,082.60 1,082.60 1,082.60
Currency forward contracts 63 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty BNP Paribas BNP Paribas BNP Paribas
Contract date Dec. 19, 2017 Dec. 19, 2017 Dec. 19, 2017
Matrurity date Mar. 21, 2018 Mar. 21, 2018 Mar. 21, 2018
Contract Amount Pay ₩ 5,419    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,083.70 1,083.70 1,083.70
Currency forward contracts 64 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty BNP Paribas BNP Paribas BNP Paribas
Contract date Dec. 19, 2017 Dec. 19, 2017 Dec. 19, 2017
Matrurity date Mar. 21, 2018 Mar. 21, 2018 Mar. 21, 2018
Contract Amount Pay ₩ 5,422    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,084.30 1,084.30 1,084.30
Currency forward contracts 65 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 19, 2017 Dec. 19, 2017 Dec. 19, 2017
Matrurity date Mar. 21, 2018 Mar. 21, 2018 Mar. 21, 2018
Contract Amount Pay ₩ 5,427    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,085.40 1,085.40 1,085.40
Currency forward contracts 66 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 19, 2017 Dec. 19, 2017 Dec. 19, 2017
Matrurity date Mar. 21, 2018 Mar. 21, 2018 Mar. 21, 2018
Contract Amount Pay ₩ 5,430    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,085.90 1,085.90 1,085.90
Currency forward contracts 67 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Dec. 14, 2017 Dec. 14, 2017 Dec. 14, 2017
Matrurity date Mar. 19, 2018 Mar. 19, 2018 Mar. 19, 2018
Contract Amount Pay ₩ 5,428    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,085.50 1,085.50 1,085.50
Currency forward contracts 68 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Standard Chartered Standard Chartered Standard Chartered
Contract date Dec. 14, 2017 Dec. 14, 2017 Dec. 14, 2017
Matrurity date Mar. 19, 2018 Mar. 19, 2018 Mar. 19, 2018
Contract Amount Pay ₩ 5,428    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,085.50 1,085.50 1,085.50
Currency forward contracts 69 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Nov. 21, 2017 Nov. 21, 2017 Nov. 21, 2017
Matrurity date Feb. 26, 2018 Feb. 26, 2018 Feb. 26, 2018
Contract Amount Pay ₩ 5,266    
Contract Amount Receive | $     $ 4,826
Contract exchange rate 1,091.10 1,091.10 1,091.10
Currency forward contracts 70 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Nov. 21, 2017 Nov. 21, 2017 Nov. 21, 2017
Matrurity date Feb. 26, 2018 Feb. 26, 2018 Feb. 26, 2018
Contract Amount Pay ₩ 5,461    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,092.10 1,092.10 1,092.10
Currency forward contracts 71 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Nov. 15, 2017 Nov. 15, 2017 Nov. 15, 2017
Matrurity date Feb. 21, 2018 Feb. 21, 2018 Feb. 21, 2018
Contract Amount Pay ₩ 1,755    
Contract Amount Receive | $     $ 1,587
Contract exchange rate 1,106.10 1,106.10 1,106.10
Currency forward contracts 72 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Nov. 15, 2017 Nov. 15, 2017 Nov. 15, 2017
Matrurity date Feb. 21, 2018 Feb. 21, 2018 Feb. 21, 2018
Contract Amount Pay ₩ 5,536    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,107.10 1,107.10 1,107.10
Currency forward contracts 73 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Nov. 15, 2017 Nov. 15, 2017 Nov. 15, 2017
Matrurity date Feb. 21, 2018 Feb. 21, 2018 Feb. 21, 2018
Contract Amount Pay ₩ 4,462    
Contract Amount Receive | $     $ 4,027
Contract exchange rate 1,108.10 1,108.10 1,108.10
Currency forward contracts 74 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Oct. 31, 2017 Oct. 31, 2017 Oct. 31, 2017
Matrurity date Feb. 06, 2018 Feb. 06, 2018 Feb. 06, 2018
Contract Amount Pay ₩ 711    
Contract Amount Receive | $     $ 638
Contract exchange rate 1,112.80 1,112.80 1,112.80
Currency forward contracts 75 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Oct. 31, 2017 Oct. 31, 2017 Oct. 31, 2017
Matrurity date Feb. 05, 2018 Feb. 05, 2018 Feb. 05, 2018
Contract Amount Pay ₩ 194    
Contract Amount Receive | $     $ 173
Contract exchange rate 1,117.80 1,117.80 1,117.80
Currency forward contracts 76 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Oct. 31, 2017 Oct. 31, 2017 Oct. 31, 2017
Matrurity date Feb. 05, 2018 Feb. 05, 2018 Feb. 05, 2018
Contract Amount Pay ₩ 5,594    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,118.80 1,118.80 1,118.80
Currency forward contracts 77 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Oct. 31, 2017 Oct. 31, 2017 Oct. 31, 2017
Matrurity date Feb. 02, 2018 Feb. 02, 2018 Feb. 02, 2018
Contract Amount Pay ₩ 5,604    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,120.80 1,120.80 1,120.80
Currency forward contracts 78 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Oct. 31, 2017 Oct. 31, 2017 Oct. 31, 2017
Matrurity date Feb. 02, 2018 Feb. 02, 2018 Feb. 02, 2018
Contract Amount Pay ₩ 5,599    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,119.80 1,119.80 1,119.80
Currency forward contracts 79 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nomura Nomura Nomura
Contract date Oct. 31, 2017 Oct. 31, 2017 Oct. 31, 2017
Matrurity date Feb. 02, 2018 Feb. 02, 2018 Feb. 02, 2018
Contract Amount Pay ₩ 5,602    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,120.40 1,120.40 1,120.40
Currency forward contracts 80 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Credit Agricole Credit Agricole Credit Agricole
Contract date Oct. 31, 2017 Oct. 31, 2017 Oct. 31, 2017
Matrurity date Feb. 02, 2018 Feb. 02, 2018 Feb. 02, 2018
Contract Amount Pay ₩ 5,604    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,120.70 1,120.70 1,120.70
Currency forward contracts 81 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Credit Agricole Credit Agricole Credit Agricole
Contract date Oct. 31, 2017 Oct. 31, 2017 Oct. 31, 2017
Matrurity date Feb. 02, 2018 Feb. 02, 2018 Feb. 02, 2018
Contract Amount Pay ₩ 5,599    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,119.70 1,119.70 1,119.70
Currency forward contracts 82 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Standard Chartered Standard Chartered Standard Chartered
Contract date Oct. 31, 2017 Oct. 31, 2017 Oct. 31, 2017
Matrurity date Feb. 02, 2018 Feb. 02, 2018 Feb. 02, 2018
Contract Amount Pay ₩ 5,604    
Contract Amount Receive | $     $ 5,000
Contract exchange rate 1,120.70 1,120.70 1,120.70
Currency forward contracts 83 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Standard Chartered Standard Chartered Standard Chartered
Contract date Oct. 31, 2017 Oct. 31, 2017 Oct. 31, 2017
Matrurity date Feb. 02, 2018 Feb. 02, 2018 Feb. 02, 2018
Contract Amount Pay ₩ 5,393    
Contract Amount Receive | $     $ 4,817
Contract exchange rate 1,119.70 1,119.70 1,119.70
Currency forward contracts 84 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Societe Generale Societe Generale Societe Generale
Contract date Oct. 31, 2017 Oct. 31, 2017 Oct. 31, 2017
Matrurity date Feb. 02, 2018 Feb. 02, 2018 Feb. 02, 2018
Contract Amount Pay ₩ 861    
Contract Amount Receive | $     $ 768
Contract exchange rate 1,120.80 1,120.80 1,120.80
Currency forward contracts 85 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty Nova Scotia Nova Scotia Nova Scotia
Contract date Oct. 26, 2017 Oct. 26, 2017 Oct. 26, 2017
Matrurity date Jan. 30, 2018 Jan. 30, 2018 Jan. 30, 2018
Contract Amount Pay ₩ 923    
Contract Amount Receive | $     $ 822
Contract exchange rate 1,123.40 1,123.40 1,123.40
Currency forward contracts 86 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty BNP Paribas BNP Paribas BNP Paribas
Contract date Oct. 13, 2017 Oct. 13, 2017 Oct. 13, 2017
Matrurity date Jan. 18, 2018 Jan. 18, 2018 Jan. 18, 2018
Contract Amount Pay ₩ 652    
Contract Amount Receive | $     $ 579
Contract exchange rate 1,125.60 1,125.60 1,125.60
Currency forward contracts 87 [Member]      
Disclosure of Derivative Currency forward contract detail list [Line Items]      
Counterparty KEB Hana Bank KEB Hana Bank KEB Hana Bank
Contract date Nov. 27, 2017 Nov. 27, 2017 Nov. 27, 2017
Matrurity date Nov. 26, 2018 Nov. 26, 2018 Nov. 26, 2018
Contract Amount Pay | ¥   ¥ 40,000  
Contract Amount Receive ₩ 398    
Contract exchange rate 9.94 9.94 9.94