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Commitments and Contingencies - Summary of Contingencies of Claim for Damages in the Event of Non-Compliance of Responsibility Completion (Detail) ₩ in Millions | Dec. 31, 2025 KRW (₩)
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Disclosure of contingent liabilities [line items] |
Balance of loans | ₩ 1,395,830
Contingencies of claim for damages [member] | Other projects [member] |
Disclosure of contingent liabilities [line items] |
Contract amount | 11,500,272
Contingency amount | 12,756,200
Balance of loans | 8,391,513
Debt Repayment Contingencies [Member] |
Disclosure of contingent liabilities [line items] |
Contract amount | 10,862,963
Contingency amount | 8,738,729
Balance of loans | 3,098,226
Debt Repayment Contingencies [Member] | Maintenance projects [member] |
Disclosure of contingent liabilities [line items] |
Contract amount | 8,665,234
Contingency amount | 3,388,729
Balance of loans | 1,705,326
Debt Repayment Contingencies [Member] | Other projects [member] |
Disclosure of contingent liabilities [line items] |
Contract amount | 2,197,729
Contingency amount | 5,350,000
Balance of loans | 1,392,900
Group [Member] | Contingencies of claim for damages [member] | Other projects [member] |
Disclosure of contingent liabilities [line items] |
Contract amount | 10,871,875
Contingency amount | 12,366,854
Balance of loans | 8,068,064
Group [Member] | Debt Repayment Contingencies [Member] |
Disclosure of contingent liabilities [line items] |
Contract amount | 8,935,162
Contingency amount | 7,957,511
Balance of loans | 2,605,573
Group [Member] | Debt Repayment Contingencies [Member] | Maintenance projects [member] |
Disclosure of contingent liabilities [line items] |
Contract amount | 6,737,433
Contingency amount | 2,607,511
Balance of loans | 1,212,673
Group [Member] | Debt Repayment Contingencies [Member] | Other projects [member] |
Disclosure of contingent liabilities [line items] |
Contract amount | 2,197,729
Contingency amount | 5,350,000
Balance of loans | ₩ 1,392,900

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