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Fair value measurement of instruments (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Financial assets, category | Assets recognized at fair value    
Disclosure of fair value measurement of instruments [Line Items]    
Book value ₩ 1,422,765 ₩ 3,088,485
Fair value 1,422,765 3,088,485
Financial assets, category | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 14,022,525 12,962,293
Fair value 14,022,525 12,962,293
Financial assets at fair value through other comprehensive income | Assets recognized at fair value    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 399,495 0
Fair value 399,495 0
Available-for-sale financial assets | Assets recognized at fair value    
Disclosure of fair value measurement of instruments [Line Items]    
Book value [1] 0 699,833
Fair value [1] 0 699,833
Derivative Financial Instruments, Assets | Not Designated as Hedging Instrument | Assets recognized at fair value    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 37,631 22,020
Fair value 37,631 22,020
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | Assets recognized at fair value    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 64,704 10,606
Fair value 64,704 10,606
Long-term financial instruments | Assets recognized at fair value    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 0 542,430
Fair value 0 542,430
Long-term financial instruments | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 448,741 0
Fair value 448,741 0
Short-term financial instruments | Assets recognized at fair value    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 0 1,702,084
Fair value 0 1,702,084
Short-term financial instruments | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 1,869,286 0
Fair value 1,869,286 0
Financial assets at fair value through profit or loss | Assets recognized at fair value    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 920,935 111,512
Fair value 920,935 111,512
Financial assets at amortized cost | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 14,042 0
Fair value 14,042 0
Held-to-maturity investments | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 0 3,144
Fair value 0 3,144
Loans and receivables | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 718,674 905,641
Fair value 718,674 905,641
Trade receivables | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 9,613,437 9,683,769
Fair value 9,613,437 9,683,769
Cash and Cash Equivalents | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 1,358,345 2,369,739
Fair value 1,358,345 2,369,739
Liabilities | Assets recognized at fair value    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 312,163 428,059
Fair value 312,163 428,059
Liabilities | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 70,381,718 63,970,393
Fair value 73,009,715 66,261,128
Derivative Financial Instruments, Liabilities | Not Designated as Hedging Instrument | Assets recognized at fair value    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 99,010 150,929
Fair value 99,010 150,929
Derivative Financial Instruments, Liabilities | Designated as Hedging Instrument | Assets recognized at fair value    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 213,153 277,130
Fair value 213,153 277,130
Secured borrowings | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 741,029 1,055,554
Fair value 741,029 1,055,554
Unsecured bond | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 56,603,988 51,146,783
Fair value 58,804,070 53,436,659
Finance lease liabilities | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 283,806 418,260
Fair value 283,806 418,260
Unsecured borrowings | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 3,522,602 2,476,196
Fair value 3,950,517 2,477,055
Trade and other payables | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value [2] 9,063,285 8,804,741
Fair value [2] 9,063,285 8,804,741
Bank overdraft | Assets carried at amortized cost    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 167,008 68,859
Fair value ₩ 167,008 ₩ 68,859
[1] Book value of equity securities held by the Company that were measured at cost as of December 31, 2017 is KRW37,926 million as a quoted market price does not exist in an active market and its fair value cannot be measured reliably.
[2] Excludes finance lease liabilities.