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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]      
Interest income ₩ 270,571 ₩ 282,704 ₩ 244,796
Interest expense (263,579) (278,427) (296,874)
Total   214,063 (116,643)
Gain (loss) on valuation 40,822 15,429 (5)
Other comprehensive income (loss) for the year 23,255 172,338 (54,628)
Reclassified to profit or loss from other comprehensive income for the year 111,431 (44,684)  
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 799 2,664  
Gain (loss) on valuation 119    
Derivatives used for hedging [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain on transactions 1,141   20,678
Gain (loss) on valuation (161,003) 4,949 42,195
Other comprehensive income (loss) for the year (81,671) 20,742 (2,810)
Reclassified to profit or loss from other comprehensive income for the year 107,786 (5,080) (28,388)
Financial liabilities at amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest expense (220,945) (223,974) (296,894)
Loss on repayment     (15)
Gain (loss) foreign currency transaction (10,717) (20,958) (30,956)
Gain (loss) on foreign currency translation 141,849 (75,502) (66,050)
Total 5,481    
Financial assets at amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 55,742 79,838 93,233
Gain (loss) foreign currency transaction (19,244) 32,293 19,396
Gain (loss) on foreign currency translation (3,895) (474) (2,901)
Gain (loss) on disposal 138 (43) 44
Gain (loss) on valuation (140,474) (59,947) (110,544)
Financial assets at fair value through profit or loss [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income 6,548 5,634 9,194
Dividend income 4,379 1,096 1,207
Gain (loss) foreign currency transaction (38) (27)  
Gain (loss) on disposal (329) 5,115 1,713
Gain (loss) on valuation 59,044 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 227,736 217,355 163,390
Dividend income 56 2,312 1,704
Gain (loss) on disposal (8,152) (11,247) (13,818)
Impairment loss   (304) (2,416)
Other comprehensive income (loss) for the year 41,997 167,152 43,811
Derivative financial liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain on transactions 6,050 6,332 7,272
Gain (loss) on valuation (2,707) 56,537 22,065
Other comprehensive income (loss) for the year (2,373) 46,806 20,078
Reclassified to profit or loss from other comprehensive income for the year ₩ 3,645 (39,604) (15,891)
Held-to-maturity financial assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain (loss) on valuation   ₩ (1,936) ₩ (2,708)