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Long-term and short-term financial instruments (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Short-term financial instruments    
Long / short-term financial instruments [Line Items]    
Time deposits ₩ 1,602,285 ₩ 1,479,034
ABCP 0 145,000
CP 0 58,050
CD 10,000 10,000
RP 0 10,000
Others 257,001 0
Long / short-term financial instruments 1,869,286 1,702,084
Long-term financial instruments    
Long / short-term financial instruments [Line Items]    
Time deposits 63,358 2
ABCP 0 65,600
CP 0 0
CD 0 0
RP 0 1,634
Others 385,383 475,194
Long / short-term financial instruments ₩ 448,741 ₩ 542,430