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Trade and Other Receivables - Changes in the allowance for doubtful accounts (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Jan. 01, 2020
Jan. 01, 2019
Jan. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Trade receivables            
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]            
Beginning balance ₩ 212,759 ₩ 215,868 ₩ 173,583 ₩ 212,759 ₩ 215,868 ₩ 173,583
Effect of change in accounting policy 0 0 6,641      
Loss allowance as at January 1 under IFRS 9 212,759 215,868 180,224      
Changes in allowance account for credit losses of financial assets            
Bad debt expense       24,021 29,221 41,498
Write-off       (20,332) (10,106) (7,696)
Reversal       (3,373) (41,940) (1,726)
Others       (4,085) 19,716 3,568
Ending balance       208,990 212,759 215,868
Other receivables            
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]            
Beginning balance 114,155 104,726 78,008 114,155 104,726 78,008
Effect of change in accounting policy 0 0 128      
Loss allowance as at January 1 under IFRS 9 ₩ 114,155 ₩ 104,726 ₩ 78,136      
Changes in allowance account for credit losses of financial assets            
Bad debt expense       27,329 19,206 17,817
Write-off       (1,910) (1,146) (244)
Reversal       (2,464) 0 (143)
Others       (4,731) (8,631) 9,160
Ending balance       ₩ 132,379 ₩ 114,155 ₩ 104,726