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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]      
Interest income ₩ 282,704 ₩ 244,796 ₩ 93,078
Interest expense (268,225) (296,874) (302,464)
Dividend income 15,354 11,146 6,212
Total   (116,643) (150,420)
Other comprehensive income (loss) for the year 172,338 (54,628) (68,288)
Reclassified to profit or loss from other comprehensive income for the year (44,684) (44,279)  
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 2,664    
Gain (loss) on valuation (1,936)    
Derivatives used for hedging [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on transaction   20,678  
Gain (loss) on valuation 4,949 42,195 (145,885)
Other comprehensive income (loss) for the year 20,742 (2,810) (66,624)
Reclassified to profit or loss from other comprehensive income for the year (5,080) (28,388) 91,698
Financial liabilities at amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest expense (223,974) (296,894) (302,464)
Loss on repayment   (15)  
Gain (loss) foreign currency transaction (20,958) (30,956) 62,347
Gain (loss) on foreign currency translation (75,502) (66,050) 225,695
Total 214,063    
Financial assets at amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 79,838 93,233 108,608
Gain (loss) foreign currency transaction 32,293 19,396 (11,949)
Gain (loss) on foreign currency translation (474) (2,901) (12,354)
Gain (loss) on disposal (43) 44 (20,351)
Gain (loss) on valuation (59,947) (110,544) (44,219)
Financial assets at fair value through profit or loss [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 5,634 9,194  
Dividend income 1,096 1,207  
Gain (loss) foreign currency transaction (27)    
Gain (loss) on disposal 5,115 1,713  
Gain (loss) on valuation 4,334 10,768  
Financial assets at fair value through other comprehensive income [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 217,355 163,390  
Dividend income 2,312 1,704  
Gain (loss) on disposal (11,247) (13,818)  
Impairment loss (304) (2,416)  
Other comprehensive income (loss) for the year 167,152 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
Gain (loss) on valuation     (464)
Derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on transaction 6,332 7,272 (58,569)
Gain (loss) on valuation 56,537 22,065 (63,640)
Other comprehensive income (loss) for the year 46,806 20,078 (44,429)
Reclassified to profit or loss from other comprehensive income for the year ₩ (39,604) (15,891) 50,231
Available-for-sale [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income     453
Dividend income     5,174
Gain (loss) on disposal     89,598
Impairment loss     (6,137)
Other comprehensive income (loss) for the year     51,235
Reclassified to profit or loss from other comprehensive income for the year     (55,450)
Held-to-maturity financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on valuation   ₩ (2,708) ₩ (3,078)