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Other Financial Assets - Summary of Long-Term and Short-Term Financial Instruments (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Short-term financial instruments    
Long / short-term financial instruments [Line Items]    
Time deposits ₩ 976,899 ₩ 996,265
CD 0 50,000
RP 0 203,008
Others 301,115 234,209
Long / short-term financial instruments 1,278,014 1,483,482
Long-term financial instruments    
Long / short-term financial instruments [Line Items]    
Time deposits 103,607 160,433
CD 0 0
RP 0 0
Others 346,887 418,188
Long / short-term financial instruments ₩ 450,494 ₩ 578,621