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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, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Beginning balance ₩ 10,387,651  
Ending balance 10,844,722 ₩ 10,387,651
Beginning balance 15,297,610  
Ending balance 15,334,068 15,297,610
Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 5,913  
Ending balance 777,685 5,913
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 5,813 6,277
Amount recognized in profit or loss   (464)
Ending balance   5,813
Recurring fair value measurement [Member] | Level 3 [Member] | Available-for-sale [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 307,077 287,889
Purchases   85,287
Reclassification   (277)
Sales   (124,159)
Amount recognized in profit or loss   (113)
Amount recognized in other comprehensive income   58,450
Ending balance   307,077
Recurring fair value measurement [Member] | Level 3 [Member] | Other derivative liabilities [Member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 5,051 1,973
Purchases   0
Reclassification   0
Sales   0
Amount recognized in profit or loss   3,078
Ending balance   5,051
Recurring fair value measurement [Member] | Level 3 [Member] | Derivative financial liabilities [member]    
Disclosure of detailed information about financial instruments [line items]    
Beginning balance 17,725  
Changes in accounting policy 0  
Purchases 0 0
Reclassification 0 0
Changes in scope of consolidation 0  
Sales 0 0
Amount recognized in profit or loss (17,255) 19,634
Amount recognized in other comprehensive income 9,713 (1,909)
Ending balance 10,183 17,725
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 5,051  
Changes in accounting policy 0  
Purchases 0  
Reclassification 0  
Changes in scope of consolidation 0  
Sales 0  
Amount recognized in profit or loss 2,707  
Ending balance 7,758 5,051
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 97,547  
Changes in accounting policy 32,745  
Purchases 21,365  
Reclassification 1,581  
Sales (1,852)  
Amount recognized in profit or loss 12,214  
Ending balance 163,600 97,547
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 238,517  
Changes in accounting policy 2,085  
Purchases 8,802  
Reclassification (296)  
Changes in scope of consolidation 364  
Sales (1,099)  
Amount recognized in profit or loss 89  
Amount recognized in other comprehensive income 63,074  
Ending balance ₩ 311,536 ₩ 238,517