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Trade and Other Receivables - Changes in the allowance for doubtful accounts (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Trade receivables      
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]      
Beginning balance ₩ 215,868 ₩ 173,583 ₩ 71,985
Effect of change in accounting policy 0 6,641  
Loss allowance as at January 1 under IFRS 9 215,868 180,224  
Changes in allowance account for credit losses of financial assets      
Bad debt expense 29,221 41,498 126,714
Write-off (10,106) (7,696) (32,995)
Reversal (41,940) (1,726) 0
Others 19,716 3,568 7,879
Ending balance 212,759 215,868 173,583
Other receivables      
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]      
Beginning balance 104,726 78,008 87,661
Effect of change in accounting policy 0 128  
Loss allowance as at January 1 under IFRS 9 104,726 78,136  
Changes in allowance account for credit losses of financial assets      
Bad debt expense 19,206 17,817 1,778
Write-off (1,146) (244) (3,129)
Reversal 0 (143) (2,166)
Others (8,631) 9,160 (6,136)
Ending balance ₩ 114,155 ₩ 104,726 ₩ 78,008