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Fair value measurement of instruments (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Financial assets, category [Member] | Assets recognized at fair value [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value ₩ 3,088,485 ₩ 4,492,032
Fair value 3,088,485 4,492,032
Financial assets, category [Member] | Assets carried at amortized cost [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 12,962,293 13,581,195
Fair value 12,962,293 13,581,195
Available-for-sale financial assets [Member] | Assets recognized at fair value [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value [1] 699,833 1,014,732
Fair value [1] 699,833 1,014,732
Derivative Financial Instruments, Assets [Member] | Not Designated as Hedging Instrument [Member] | Assets recognized at fair value [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 22,020 367,477
Fair value 22,020 367,477
Derivative Financial Instruments, Assets [Member] | Designated as Hedging Instrument [Member] | Assets recognized at fair value [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 10,606 413,897
Fair value 10,606 413,897
Long-term financial instruments [Member] | Assets recognized at fair value [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 542,430 414,466
Fair value 542,430 414,466
Short-term financial instruments [Member] | Assets recognized at fair value [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 1,702,084 2,281,460
Fair value 1,702,084 2,281,460
Financial assets at fair value through profit or loss [Member] | Assets recognized at fair value [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 111,512  
Fair value 111,512  
Held-to-maturity investments [Member] | Assets carried at amortized cost [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 3,144 3,244
Fair value 3,144 3,244
Loans and receivables [Member] | Assets carried at amortized cost [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 905,641 834,207
Fair value 905,641 834,207
Trade receivables [Member] | Assets carried at amortized cost [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 9,683,769 9,692,391
Fair value 9,683,769 9,692,391
Cash and Cash Equivalents [Member] | Assets carried at amortized cost [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 2,369,739 3,051,353
Fair value 2,369,739 3,051,353
Liabilities [Member] | Assets recognized at fair value [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 428,059 138,686
Fair value 428,059 138,686
Liabilities [Member] | Assets carried at amortized cost [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 63,970,393 62,782,791
Fair value 66,261,128 66,498,346
Derivative Financial Instruments, Liabilities [Member] | Not Designated as Hedging Instrument [Member] | Assets recognized at fair value [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 150,929 21,529
Fair value 150,929 21,529
Derivative Financial Instruments, Liabilities [Member] | Designated as Hedging Instrument [Member] | Assets recognized at fair value [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 277,130 117,157
Fair value 277,130 117,157
Secured borrowings [Member] | Assets carried at amortized cost [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 1,055,554 744,565
Fair value 1,055,554 744,565
Unsecured bond [Member] | Assets carried at amortized cost [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 51,146,783 50,749,793
Fair value 53,436,659 54,455,659
Finance lease liabilities [Member] | Assets carried at amortized cost [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 418,260 541,179
Fair value 418,260 541,179
Unsecured borrowings [Member] | Assets carried at amortized cost [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 2,476,196 2,089,885
Fair value 2,477,055 2,099,574
Trade and other payables [Member] | Assets carried at amortized cost [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value [2] 8,804,741 8,602,407
Fair value [2] 8,804,741 8,602,407
Bank overdraft [Member] | Assets carried at amortized cost [Member]    
Disclosure of fair value measurement of instruments [Line Items]    
Book value 68,859 54,962
Fair value ₩ 68,859 ₩ 54,962
[1] Book values of equity securities held by the Company that were measured at cost as of December 31, 2016 and 2017 are ￦138,557 million and ￦37,926 million, respectively, 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.