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Trade and Other Receivables - Changes in the Allowance for Doubtful Accounts (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]      
Beginning balance ₩ (25,175,820)    
Changes in allowance account for credit losses of financial assets      
Ending balance (26,197,311) ₩ (25,175,820)  
Trade receivables | Allowance for credit losses [member]      
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]      
Beginning balance 232,645 199,000 ₩ 205,339
Changes in allowance account for credit losses of financial assets      
Bad debt expense 48,160 68,385 27,078
Write-off (17,157) (26,109) (26,319)
Reversal (12,928) (5,577) (3,444)
Others 10,054 (3,054) (3,654)
Ending balance 260,774 232,645 199,000
Other receivables | Allowance for credit losses [member]      
Reconciliation of changes in allowance account for credit losses of financial assets [Line Items]      
Beginning balance 133,953 109,453 82,710
Changes in allowance account for credit losses of financial assets      
Bad debt expense 21,937 24,290 4,220
Write-off (23,177) (4,472) (1,103)
Reversal (587) (1,942) (37)
Others 8,042 6,624 23,663
Ending balance ₩ 140,168 ₩ 133,953 ₩ 109,453