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Long-term and short-term financial instruments (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Short-term financial instruments    
Long / short-term financial instruments [Line Items]    
Time deposits ₩ 996,265 ₩ 1,034,971
CP 0 40,000
CD 50,000 15,000
RP 203,008 40,000
Others 234,209 222,000
Long / short-term financial instruments 1,483,482 1,351,971
Long-term financial instruments    
Long / short-term financial instruments [Line Items]    
Time deposits 160,433 257,857
CP 0 0
CD 0 0
RP 0 0
Others 418,188 350,399
Long / short-term financial instruments ₩ 578,621 ₩ 608,256