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Trade and Other Receivables - Other Receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Gross amount    
Trade and Other Receivables [Line Items]    
Trade receivables Face value ₩ 7,929,247 ₩ 7,598,184
Trade receivables Allowance for doubtful accounts (205,339) (208,990)
Trade receivables 7,723,908 7,389,194
Other receivables Face value 2,395,008 2,528,084
Other receivables Allowance for doubtful accounts (82,710) (132,379)
Other receivables Present value discount (6,930) (4,860)
Other receivables 2,305,368 2,390,845
Current    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 7,603,472 7,274,773
Other receivables Face value 2,251,474 2,363,967
Trade and Other receivables: (impairment reviewed)    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 325,775 323,411
Other receivables Face value 143,534 164,117
Less than 60 days    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 11,577 3,505
Other receivables Face value 87 46,399
60 ~ 90 days    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 27,201 28,729
Other receivables Face value 4,881 31,183
90 ~ 120 days    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 28,230 10,687
Other receivables Face value 1,248 1,873
120 days ~ 1year    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 51,945 34,036
Other receivables Face value 11,438 11,803
Over 1 year    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 206,822 246,454
Other receivables Face value ₩ 125,880 ₩ 72,859