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Changes in Accounting Policies - Summary of Effects Resulting from Classification and Measurement of Financial Instruments (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Cash and cash equivalent ₩ 2,703,422   ₩ 1,928,182 ₩ 2,900,311 ₩ 2,900,311 ₩ 2,559,464
Trade and other receivables 6,523,344   6,793,397      
Other financial assets 1,617,956   1,727,623      
Trade payables and payables 8,521,379   8,427,457      
Borrowing 6,648,293   6,683,662      
Other financial liabilities ₩ 164,396   ₩ 186,491      
Loans and receivables under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Trade and other receivables   ₩ (1,028)        
Other financial assets   (789)        
Loans and receivables under IAS 39 reclassified to financial assets at fair value through other comprehensive income under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Trade and other receivables   24,486        
Financial assets available -for- sale under IAS 39 reclassified to financial assets at fair value through profit or loss under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   32,745        
Financial assets available -for- sale under IAS 39 reclassified to financial assets at fair value through other comprehensive income under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   2,085        
Other financial liabilities measured at amortized cost under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial liabilities   287        
IAS 39 [member] | Loans and receivables under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Cash and cash equivalent   1,928,182        
Trade and other receivables   6,793,397        
Other financial assets   1,333,317        
IAS 39 [member] | Financial assets at fair value through profit or loss under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   5,813        
IAS 39 [member] | Derivative financial assets for hedging purpose under IAS 39 reclassified to Derivative financial assets for hedging purpose under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   7,389        
IAS 39 [member] | Financial assets available -for- sale under IAS 39 reclassified to financial assets at fair value through profit or loss under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   380,953        
IAS 39 [member] | Financial assets held to maturity under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   151        
IAS 39 [member] | Other financial liabilities measured at amortized cost under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Trade payables and payables   8,427,457        
Borrowing   6,683,662        
Other financial liabilities   89,104        
IAS 39 [member] | Financial liabilities at fair value through profit or loss under IAS 39 reclassified to financial liabilities at fair value through profit or loss under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial liabilities   5,051        
IAS 39 [member] | Derivative financial liabilities for hedging purpose under IAS 39 reclassified to derivative financial liabilities for hedging purpose under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial liabilities   93,770        
IFRS9 [member] | Loans and receivables under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Cash and cash equivalent   1,928,182        
Trade and other receivables   5,836,089        
Other financial assets   462,075        
IFRS9 [member] | Loans and receivables under IAS 39 reclassified to financial assets at fair value through other comprehensive income under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Trade and other receivables   980,766        
IFRS9 [member] | Loans and receivables under IAS 39 reclassified to financial assets at fair value through profit or loss under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   870,453        
IFRS9 [member] | Financial assets at fair value through profit or loss under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   5,813        
IFRS9 [member] | Derivative financial assets for hedging purpose under IAS 39 reclassified to Derivative financial assets for hedging purpose under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   7,389        
IFRS9 [member] | Financial assets available -for- sale under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   28,603        
IFRS9 [member] | Financial assets available -for- sale under IAS 39 reclassified to financial assets at fair value through profit or loss under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   127,276        
IFRS9 [member] | Financial assets available -for- sale under IAS 39 reclassified to financial assets at fair value through other comprehensive income under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   259,904        
IFRS9 [member] | Financial assets held to maturity under IAS 39 reclassified to Financial assets measured at amortized cost under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   51        
IFRS9 [member] | Financial assets held to maturity under IAS 39 reclassified to Financial assets at fair value through profit or loss under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial assets   100        
IFRS9 [member] | Other financial liabilities measured at amortized cost under IAS 39 reclassified to financial assets measured at amortized cost under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Trade payables and payables   8,427,457        
Borrowing   6,683,662        
Other financial liabilities   89,391        
IFRS9 [member] | Financial liabilities at fair value through profit or loss under IAS 39 reclassified to financial liabilities at fair value through profit or loss under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial liabilities   5,051        
IFRS9 [member] | Derivative financial liabilities for hedging purpose under IAS 39 reclassified to derivative financial liabilities for hedging purpose under IFRS 9 [member]            
Disclosure of expected impact of initial application of new standards or interpretations [line items]            
Other financial liabilities   ₩ 93,770