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Classification of Financial Instruments - Classification of comprehensive income (loss) from financial instruments (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income, expense, gains or losses of financial instruments [Abstract]      
Interest income ₩ 206,143 ₩ 241,778 ₩ 241,585
Dividend income 11,477 9,446 14,069
Impairment of available-for-sale financial assets (2,713) (86,703) (84,370)
Gain (loss) on valuation of derivatives (874,667) 288,068 593,531
Gain on valuation of financial assets 12    
Interest expense of trade and other payables (57,160) (68,375) (84,527)
Interest expense of others (491,665) (482,428) (538,680)
Cash and Cash Equivalents [Member]      
Income, expense, gains or losses of financial instruments [Abstract]      
Interest income 35,474 61,380 54,687
Financial assets available-for-sale [Member]      
Income, expense, gains or losses of financial instruments [Abstract]      
Interest income     29
Dividend income 11,477 9,446 14,069
Impairment of available-for-sale financial assets (2,713) (86,703) (84,370)
Gain (loss) on disposal of available-for-sale financial assets (1,213) 1,473 (3,004)
Held-to-maturity investments [Member]      
Income, expense, gains or losses of financial instruments [Abstract]      
Interest income 82 97 99
Loans and receivables [Member]      
Income, expense, gains or losses of financial instruments [Abstract]      
Interest income 30,014 25,106 28,586
Trade and other receivables [Member]      
Income, expense, gains or losses of financial instruments [Abstract]      
Interest income 102,727 102,237 100,771
Short-term financial instruments [Member]      
Income, expense, gains or losses of financial instruments [Abstract]      
Interest income 29,412 45,763 46,921
Long-term financial instruments [Member]      
Income, expense, gains or losses of financial instruments [Abstract]      
Interest income 8,144 7,195 10,492
Financial assets at fair value through profit or loss [Member]      
Income, expense, gains or losses of financial instruments [Abstract]      
Interest income 290    
Gain (loss) on valuation of derivatives (214,100) 113,671 220,285
Gain (loss) on transaction of derivatives (37,266) (8,039) 8,605
Gain on valuation of financial assets 12    
Derivative assets (using hedge accounting) [Member]      
Income, expense, gains or losses of financial instruments [Abstract]      
Gain (loss) on valuation of derivatives (41,129) 145,458 244,020
Gain (loss) on transaction of derivatives (58,299) (13,994) 2,818
Gain (loss) on valuation of derivatives (equity, before tax) [1] 2,453 50,047 (12,572)
Financial liabilities recognized at amortized cost [Member]      
Income, expense, gains or losses of financial instruments [Abstract]      
Interest expense of borrowings and debt securities (1,240,727) (1,202,065) (1,392,477)
Interest expense of trade and other payables (57,160) (68,375) (84,527)
Interest expense of others (491,665) (482,428) (538,680)
Loss on retirement of financial liabilities (5) (23,000) (33)
Gain (loss) on foreign currency transactions and translations 1,075,215 (290,485) (708,178)
Financial liabilities at fair value through profit or loss [Member]      
Income, expense, gains or losses of financial instruments [Abstract]      
Gain (loss) on valuation of derivatives (179,879) 23,225 35,312
Gain (loss) on transaction of derivatives (27,175) 17,045 107,454
Derivative liabilities (using hedge accounting) [Member]      
Income, expense, gains or losses of financial instruments [Abstract]      
Gain (loss) on valuation of derivatives (439,559) 5,714 93,914
Gain (loss) on transaction of derivatives (46,221) (51,450) (4,288)
Gain (loss) on valuation of derivatives (equity, before tax) [1] ₩ 29,431 ₩ (3,297) ₩ 9,728
[1] Items are included in other comprehensive income or loss. All other income and gain amounts listed above are included in finance income, and all expense and losses listed above are included in finance expenses in the consolidated statements of comprehensive income or loss.