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Long-term and short-term financial instruments (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Short-term financial instruments    
Long / short-term financial instruments [Line Items]    
Time deposits ₩ 1,034,971 ₩ 1,602,285
CP 40,000 0
CD 15,000 10,000
RP 40,000 0
Others 222,000 257,001
Long / short-term financial instruments 1,351,971 1,869,286
Long-term financial instruments    
Long / short-term financial instruments [Line Items]    
Time deposits 257,857 63,358
CP 0 0
CD 0 0
RP 0 0
Others 350,399 385,383
Long / short-term financial instruments ₩ 608,256 ₩ 448,741