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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, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Beginning balance ₩ 10,844,722  
Ending balance 11,000,665 ₩ 10,844,722
Beginning balance 15,170,209  
Ending balance 16,128,644 15,170,209
Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 777,685  
Ending balance 632,324 777,685
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 163,600  
Purchases 584,671  
Reclassification 225,873  
Disposal (485,419)  
Amount recognized in profit or loss 6,416  
Amount recognized in other comprehensive income 0  
Ending balance 495,141 163,600
Recurring fair value measurement [Member] | Level 3 [Member] | Derivative financial liabilities [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 10,183 17,725
Changes in accounting policy   0
Purchases   0
Reclassification   0
Changes in scope of consolidation   0
Disposal   0
Amount recognized in profit or loss 14,462 (17,255)
Amount recognized in other comprehensive income 13,509 9,713
Ending balance 17,788 10,183
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 5,051
Changes in accounting policy   0
Purchases   0
Reclassification   0
Changes in scope of consolidation   0
Disposal (9,734) 0
Amount recognized in profit or loss 1,976 2,707
Ending balance   7,758
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 163,600 97,547
Changes in accounting policy   32,745
Purchases   21,365
Reclassification   1,581
Disposal   (1,852)
Amount recognized in profit or loss   12,214
Ending balance   163,600
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 311,536 238,517
Changes in accounting policy   2,085
Purchases 6,081 8,802
Reclassification (444,782) (296)
Changes in scope of consolidation   364
Disposal (941) (1,099)
Amount recognized in profit or loss 0 89
Amount recognized in other comprehensive income 170,160 63,074
Ending balance ₩ 42,054 ₩ 311,536