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v3.25.1

Statement of Cash Flows - Summary of Significant Non-cash Activities (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Transfer from construction-in-progress to other assets |  |  |
Non Cash Transactions [Line Items] |  |  |
Non-cash transactions | ₩ 15,059,467 | ₩ 10,090,726 | ₩ 13,723,972
Recognition of asset retirement cost and related provision for decommissioning costs |  |  |
Non Cash Transactions [Line Items] |  |  |
Non-cash transactions | 1,821,415 | (292,120) | 3,497,866
Transfer from provision for disposal of spent nuclear fuel to accrued expenses |  |  |
Non Cash Transactions [Line Items] |  |  |
Non-cash transactions | 463,388 | 379,011 | 417,687
Transfer from long-term borrowings to current portion of long-term borrowings |  |  |
Non Cash Transactions [Line Items] |  |  |
Non-cash transactions | 8,417,793 | 5,779,487 | 3,637,428
Transfer from debt securities to current portion of debt securities |  |  |
Non Cash Transactions [Line Items] |  |  |
Non-cash transactions | 26,901,367 | 24,674,525 | 10,201,149
Transfer from inventory to stored nuclear fuel |  |  |
Non Cash Transactions [Line Items] |  |  |
Non-cash transactions | 1,002,036 | 827,279 | 738,720
Transfer of right-of-use assets due to change in accounting policy and others |  |  |
Non Cash Transactions [Line Items] |  |  |
Non-cash transactions | ₩ 132,495 | ₩ 261,862 | ₩ 197,016

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