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Statement of Cash Flows (Tables) | 12 Months Ended
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Dec. 31, 2023
Non Cash Transactions [Abstract] |
Summary of Significant Non-cash Activities |
(1) | Significant non-cash transactions for the years ended December 31, 2021, 2022 and 2023 are as follows:
Transactions |  |  |  |  | 2021 |  |  | 2022 |  |  | 2023 |
|  |  |  |  | In millions of won |
Transfer from construction-in-progress to other assets |  | ￦ |  |  |  |  | 12,902,589 |  |  |  | 13,723,972 |  |  |  | 10,090,726 |
Recognition of asset retirement cost and related provision for decommissioning costs |  |  |  |  |  |  | 2,356,805 |  |  |  | 3,497,866 |  |  |  | (292,120 | )
Transfer from provision for disposal of spent nuclear fuel to accrued expenses |  |  |  |  |  |  | 455,401 |  |  |  | 417,687 |  |  |  | 379,011 |
Transfer from long-term borrowings and debt securities to current portion of long-term borrowings and debt securities |  |  |  |  |  |  | 11,109,271 |  |  |  | 13,838,578 |  |  |  | 30,454,012 |
Transfer from inventory to stored nuclear fuel |  |  |  |  |  |  | 908,842 |  |  |  | 738,720 |  |  |  | 827,279 |
Transfer of right-of-use assets due to change in accounting policy and others |  |  |  |  |  |  | 78,213 |  |  |  | 197,016 |  |  |  | 261,862 |
Summary of Changes in Liabilities Incurred From Financing Activities |
(2) | Changes in liabilities incurred from financing activities for the years ended December 31, 2022 and 2023 are as follows:
|  |  |  |  | 2022 |
|  |  |  |  |  |  |  |  |  |  | Non-cash changes |  |  |  |
|  |  |  |  | Beginning balance |  |  | Cash flows |  |  | Increase |  |  | Effect of exchange rate fluctuations and others |  |  | Ending balance |
|  |  |  |  | In millions of won |
Borrowings and debt securities |  | ￦ |  |  |  |  | 80,529,513 |  |  |  | 39,193,815 |  |  |  | — |  |  |  | 882,037 |  |  |  | 120,605,365 |
Lease liabilities |  |  |  |  |  |  | 4,410,503 |  |  |  | (562,647 | ) |  |  | 109,019 |  |  |  | 206,268 |  |  |  | 4,163,143 |
|  | ￦ |  |  |  |  | 84,940,016 |  |  |  | 38,631,168 |  |  |  | 109,019 |  |  |  | 1,088,305 |  |  |  | 124,768,508 |
|  |  |  |  | 2023 |
|  |  |  |  |  |  |  |  |  |  | Non-cash changes |  |  |  |
|  |  |  |  | Beginning balance |  |  | Cash flows |  |  | Increase |  |  | Effect of exchange rate fluctuations and others |  |  | Ending balance |
|  |  |  |  | In millions of won |
Borrowings and debt securities |  | ￦ |  |  |  |  | 120,605,365 |  |  |  | 12,692,924 |  |  |  | — |  |  |  | 333,541 |  |  |  | 133,631,830 |
Lease liabilities |  |  |  |  |  |  | 4,163,143 |  |  |  | (574,239 | ) |  |  | 253,495 |  |  |  | (34,519 | ) |  |  | 3,807,880 |
|  | ￦ |  |  |  |  | 124,768,508 |  |  |  | 12,118,685 |  |  |  | 253,495 |  |  |  | 299,022 |  |  |  | 137,439,710 |

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