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Statement of Cash Flows - Summary of Significant Non-cash Activities (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Transfer from construction-in-progress to other assets      
Non Cash Transactions [Line Items]      
Non-cash transactions ₩ 12,902,589 ₩ 10,189,527 ₩ 14,052,094
Recognition of asset retirement cost and related provision for decommissioning costs      
Non Cash Transactions [Line Items]      
Non-cash transactions 2,356,805 895,507 2,425,668
Transfer from provision for disposal of spent nuclear fuel to accrued expenses      
Non Cash Transactions [Line Items]      
Non-cash transactions 455,401 395,921 376,103
Transfer from long-term borrowings and debt securities to current portion of long-term borrowings and debt securities      
Non Cash Transactions [Line Items]      
Non-cash transactions 11,109,271 9,237,883 7,759,284
Transfer from inventory to stored nuclear fuel      
Non Cash Transactions [Line Items]      
Non-cash transactions 908,842 1,055,974 1,129,374
Transfer of right-of-use assets due to change in accounting policy      
Non Cash Transactions [Line Items]      
Non-cash transactions ₩ 78,213 ₩ 291,334 ₩ 5,364,647