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Financial Instruments by Category - Summary of Gains or Losses Arising From Financial Instruments by Category (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about financial instruments [Line Items]      
Interest income ₩ 93,078 ₩ 115,686 ₩ 70,035
Interest expense (302,464) (337,219) (385,925)
Dividend income 6,212 7,554  
Total (150,420) (308,677) (385,127)
Other comprehensive income for the year (68,288) (5,670) (68,835)
Reclassified to profit or loss from other comprehensive income for the year 86,479 (79,384)  
Financial liabilities designated as at fair value through profit or loss [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Gain (loss) on disposal   (632) (850)
Gain (loss) on valuation (3,078) 33 (2,006)
Derivatives used for hedging [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Gain (loss) on transactions   8,329 (273)
Gain (loss) on valuation (145,885) (138) (1,733)
Other comprehensive income for the year (66,624) 4,295 11,513
Reclassified to profit or loss from other comprehensive income for the year 91,698 (3,956) (9,959)
Financial liabilities at amortized cost [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Interest expense (302,464) (337,219) (385,925)
Gain (loss) foreign currency transaction 62,347 (7,518) (23,416)
Gain(loss) foreign currency translation 225,695 (112,864) (166,254)
Loans and receivables [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Interest income 108,608 129,813 85,603
Gain (loss) foreign currency transaction (11,949) (7,493) (365)
Gain(loss) on foreign currency translation (12,354) 3,083 1,921
Gain (loss) on disposal (20,351) (15,838) (2,539)
Gain (loss) on valuation (44,219) (92,589) (141,555)
Financial assets at fair value through profit or loss [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Dividend income 1    
Gain (loss) on disposal 153 186 368
Gain (loss) on valuation (464) (7,184)  
Derivative liabilities for hedging purpose [Member]      
Disclosure of detailed information about financial instruments [Line Items]      
Gain (loss) on transactions (58,569)   (5,157)
Gain (loss) on valuation (63,640) 109,436 141,512
Other comprehensive income for the year (44,429) 60,501 100,401
Reclassified to profit or loss from other comprehensive income for the year 50,231 (71,915) (88,003)
Available-for-sale [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Interest income 453 40 73
Dividend income 5,174 3,926 7,733
Gain (loss) on disposal 89,598 22,695 131,045
Impairment loss (6,137) (966) (1,471)
Other comprehensive income for the year 51,235 10,925 47,381
Reclassified to profit or loss from other comprehensive income for the year ₩ (55,450) (3,840) (83,397)
Held-to-maturity financial assets [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Interest income   ₩ 213 ₩ 226