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Statement of Cash Flows - Summary of Significant Non-cash Activities (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
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