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Fair Value - Summary of Changes in Level 3 of Fair Value Hierarchy for Recurring Fair Value Measurements (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Beginning balance ₩ 11,000,665  
Ending balance 10,476,853 ₩ 11,000,665
Beginning balance 16,128,644  
Ending balance 14,597,106 16,128,644
Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 632,324  
Ending balance 809,919 632,324
Level 3 [Member] | Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Disposal   (9,734)
Recurring fair value measurement [Member] | Level 3 [Member] | Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 495,141  
Purchases 374,259  
Reclassification 208  
Disposal (451,663) (485,419)
Amount recognized in profit or loss 14,564  
Ending balance 432,509 495,141
Recurring fair value measurement [Member] | Level 3 [Member] | Derivative financial liabilities [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 17,788 (10,183)
Amount recognized in profit or loss   14,462
Amount recognized in other comprehensive income   13,509
Ending balance   17,788
Beginning balance (17,788)  
Amount recognized in profit or loss 29,345  
Amount recognized in other comprehensive income (7,363)  
Ending balance 4,194 (17,788)
Recurring fair value measurement [Member] | Level 3 [Member] | Financial liabilities designated as at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance   7,758
Amount recognized in profit or loss (161) 1,976
Recurring fair value measurement [Member] | Level 3 [Member] | Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 495,141 163,600
Purchases   584,671
Reclassification   225,873
Amount recognized in profit or loss   6,416
Ending balance   495,141
Purchases 2,798  
Ending balance 2,637  
Recurring fair value measurement [Member] | Level 3 [Member] | Financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 42,054 311,536
Purchases 13,142 6,081
Reclassification   (444,782)
Disposal (571) (941)
Amount recognized in profit or loss (428)  
Amount recognized in other comprehensive income (3,408) 170,160
Ending balance ₩ 50,789 ₩ 42,054