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Trade and Other Receivables - Changes in the Allowance for Doubtful Accounts (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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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

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