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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]      
Interest income ₩ 244,796 ₩ 93,078 ₩ 115,686
Interest expense (296,874) (302,464) (337,219)
Dividend income 11,146 6,212  
Total (116,643) (150,420) (308,677)
Other comprehensive income for the year (54,628) (68,288) (5,670)
Reclassified to profit or loss from other comprehensive income for the year (44,279) 86,479  
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)
Gain (loss) on valuation (2,708) (3,078) 33
Derivatives used for hedging [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on transaction 20,678   8,329
Gain (loss) on valuation 42,195 (145,885) (138)
Other comprehensive income for the year (2,810) (66,624) 4,295
Reclassified to profit or loss from other comprehensive income for the year (28,388) 91,698 (3,956)
Financial liabilities at amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest expense (296,894) (302,464) (337,219)
Gain(loss) on repayment (15)    
Gain (loss) foreign currency transaction (30,956) 62,347 (7,518)
Gain(loss) foreign currency translation (66,050) 225,695 (112,864)
Financial assets at amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 93,233 108,608 129,813
Gain (loss) foreign currency transaction 19,396 (11,949) (7,493)
Gain (loss) on foreign currency translation (2,901) (12,354) 3,083
Gain (loss) on disposal 44 (20,351) (15,838)
Gain (loss) on valuation (110,544) (44,219) (92,589)
Financial assets at fair value through profit or loss [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 9,194    
Dividend income 1,207    
Gain (loss) on disposal 1,713    
Gain (loss) on valuation 10,768    
Financial assets at fair value through other comprehensive income [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 163,390    
Dividend income 1,704    
Gain (loss) on disposal (13,818)    
Impairment loss (2,416)    
Other comprehensive income for the year 43,811    
Asset 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
Gain (loss) on valuation   (464) (7,184)
Derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on transaction 7,272 (58,569)  
Gain (loss) on valuation 22,065 (63,640) 109,436
Other comprehensive income for the year 20,078 (44,429) 60,501
Reclassified to profit or loss from other comprehensive income for the year ₩ (15,891) 50,231 (71,915)
Available-for-sale [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income   453 40
Dividend income   5,174 3,926
Gain (loss) on disposal   89,598 22,695
Impairment loss   (6,137) (966)
Other comprehensive income for the year   51,235 10,925
Reclassified to profit or loss from other comprehensive income for the year   ₩ (55,450) (3,840)
Held-to-maturity financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income     ₩ 213