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Basis of Preparation - Summary of Change in Accounting Policy (Details) ₩ / shares in Units, ₩ in Millions | 12 Months Ended |  |
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Dec. 31, 2022 KRW (₩) ₩ / shares | Dec. 31, 2021 KRW (₩) ₩ / shares | Dec. 31, 2020 KRW (₩) ₩ / shares | Dec. 31, 2020 KRW (₩) $ / shares | Jan. 01, 2021 KRW (₩) | Dec. 31, 2019 KRW (₩)
Disclosure of voluntary change in accounting policy [line items] |  |  |  |  |  |
Current assets | ₩ 29,750,545 | ₩ 22,050,845 |  |  |  |
Non-current assets | 205,054,449 | 189,072,882 |  |  |  |
Total Assets (Notes 2 and 4) | 234,804,994 | 211,123,727 |  |  |  |
Current liabilities | 44,518,577 | 31,732,220 |  |  |  |
Non-current liabilities | 148,286,161 | 114,064,801 |  |  |  |
Total liabilities (Note 4) | 192,804,738 | 145,797,021 |  |  |  |
Contributed capital | 4,053,578 | 4,053,578 |  |  |  |
Retained earnings | 21,431,300 | 45,258,244 |  |  |  |
Other components of equity | 15,060,518 | 14,468,450 |  |  |  |
Non-controlling interests | 1,454,860 | 1,546,434 |  |  |  |
Total Equity (Note 2) | 42,000,256 | 65,326,706 | ₩ 70,668,059 | ₩ 70,668,059 |  | ₩ 68,889,649
Total Liabilities and Equity | 234,804,994 | 211,123,727 |  |  |  |
Sales | 70,546,024 | 60,012,375 | 57,926,634 |  |  |
Cost of sales | (100,903,594) | (63,644,290) | (51,804,179) |  |  |
Gross profit (loss) | (30,357,570) | (3,631,915) | 6,122,455 |  |  |
Selling and administrative expenses | (3,009,422) | (2,875,796) | (2,678,443) |  |  |
Operating profit (loss) (Note 4) | (32,240,531) | (5,722,991) | 4,097,834 |  |  |
Other non-operating income | 1,095,489 | 1,034,133 | 1,036,448 |  |  |
Other non-operating expense | (212,150) | (257,932) | (417,720) |  |  |
Other gains, net | 243,122 | 8,519 | 35,094 |  |  |
Finance income | 1,833,312 | 1,402,614 | 1,510,249 |  |  |
Finance expenses (Notes 5,12 and 40) | (4,746,791) | (3,245,777) | (2,896,443) |  |  |
Profit related to associates, joint ventures and subsidiaries | 1,310,391 | 494,584 | 281,107 |  |  |
Profit (loss) before income tax | (33,843,619) | (7,071,570) | 2,992,747 |  |  |
Income tax benefit | 9,414,511 | 1,855,989 | (899,064) |  |  |
Profit (loss) for the year | (24,429,108) | (5,215,581) | 2,093,683 |  |  |
Loss attributable to owners of the controlling company | (24,466,853) | (5,304,522) | 1,992,077 |  |  |
Profit attributable to non-controlling interests | 37,745 | 88,941 | 101,606 |  |  |
Other comprehensive income (loss) | 1,246,869 | 599,614 | (219,841) |  |  |
Total comprehensive income (loss) for the year | (23,182,239) | (4,615,967) | 1,873,842 |  |  |
Total comprehensive loss attributable to owners of the controlling company | (23,273,171) | (4,743,513) | 1,803,554 |  |  |
Total comprehensive income (attributable to non-controlling interests | ₩ 90,932 | ₩ 127,546 | ₩ 70,288 |  |  |
Loss per share (in won), Basic | ₩ / shares | ₩ (38,112) | ₩ (8,263) | ₩ 3,102 |  |  |
Loss per share (in won), Diluted | ₩ / shares | ₩ (38,112) | ₩ (8,263) | ₩ 3,102 |  |  |
Cash flows from operating activities | ₩ (23,477,500) | ₩ 4,491,378 | ₩ 13,208,474 |  |  |
Cash flows from investing activities | (14,953,753) | (12,372,520) | (14,831,812) |  |  |
Cash flows from financing activities | ₩ 38,997,899 | 8,435,077 | 1,880,824 |  |  |
Previously stated |  |  |  |  |  |
Disclosure of voluntary change in accounting policy [line items] |  |  |  |  |  |
Current assets |  | 22,050,845 |  |  | ₩ 20,561,941 |
Non-current assets |  | 189,058,025 |  |  | 182,580,170 |
Total Assets (Notes 2 and 4) |  | 211,108,870 |  |  | 203,142,111 |
Current liabilities |  | 31,732,220 |  |  | 25,881,222 |
Non-current liabilities |  | 114,064,801 |  |  | 106,594,043 |
Total liabilities (Note 4) |  | 145,797,021 |  |  | 132,475,265 |
Contributed capital |  | 4,053,578 |  |  | 4,053,578 |
Retained earnings |  | 45,246,982 |  |  | 51,133,601 |
Other components of equity |  | 14,468,450 |  |  | 14,109,501 |
Non-controlling interests |  | 1,542,839 |  |  | 1,370,166 |
Total Equity (Note 2) |  | 65,311,849 |  |  | 70,666,846 |
Total Liabilities and Equity |  | 211,108,870 |  |  | 203,142,111 |
Sales |  | 60,574,819 | 57,925,837 |  |  |
Cost of sales |  | (63,559,178) | (51,804,596) |  |  |
Gross profit (loss) |  | (2,984,359) | 6,121,241 |  |  |
Selling and administrative expenses |  | (2,875,784) | (2,678,443) |  |  |
Operating profit (loss) (Note 4) |  | (5,860,143) | 3,442,798 |  |  |
Other non-operating income |  | 372,921 | 1,036,448 |  |  |
Other non-operating expense |  | (257,932) | (417,720) |  |  |
Other gains, net |  | 8,519 | 35,094 |  |  |
Finance income |  | 1,402,614 | 1,510,249 |  |  |
Finance expenses (Notes 5,12 and 40) |  | (3,245,777) | (2,896,443) |  |  |
Profit related to associates, joint ventures and subsidiaries |  | 494,584 | 281,107 |  |  |
Profit (loss) before income tax |  | (7,085,214) | 2,991,533 |  |  |
Income tax benefit |  | 1,855,989 | (899,064) |  |  |
Profit (loss) for the year |  | (5,229,225) | 2,092,469 |  |  |
Loss attributable to owners of the controlling company |  | (5,315,055) | 1,991,347 |  |  |
Profit attributable to non-controlling interests |  | 85,830 | 101,122 |  |  |
Other comprehensive income (loss) |  | 599,614 | (219,841) |  |  |
Total comprehensive income (loss) for the year |  | (4,629,611) | 1,872,628 |  |  |
Total comprehensive loss attributable to owners of the controlling company |  | (4,754,046) | 1,802,824 |  |  |
Total comprehensive income (attributable to non-controlling interests |  | ₩ 124,435 | 69,804 |  |  |
Loss per share (in won), Basic | (per share) |  | ₩ (8,279) |  | ₩ 3,102 |  |
Loss per share (in won), Diluted | (per share) |  | ₩ (8,279) |  | 3,102 |  |
Cash flows from operating activities |  | ₩ 4,473,186 | 13,208,473 |  |  |
Cash flows from investing activities |  | (12,354,328) | (14,831,811) |  |  |
Cash flows from financing activities |  | 8,435,077 | 1,880,824 |  |  |
Adjustment |  |  |  |  |  |
Disclosure of voluntary change in accounting policy [line items] |  |  |  |  |  |
Current assets |  | 0 |  |  | 0 |
Non-current assets |  | 14,857 |  |  | 1,214 |
Total Assets (Notes 2 and 4) |  | 14,857 |  |  | 1,214 |
Current liabilities |  | 0 |  |  | 0 |
Non-current liabilities |  | 0 |  |  | 0 |
Total liabilities (Note 4) |  | 0 |  |  | 0 |
Contributed capital |  | 0 |  |  | 0 |
Retained earnings |  | 11,262 |  |  | 730 |
Other components of equity |  | 0 |  |  | 0 |
Non-controlling interests |  | 3,595 |  |  | 484 |
Total Equity (Note 2) |  | 14,857 |  |  | 1,214 |
Total Liabilities and Equity |  | 14,857 |  |  | 1,214 |
Sales |  | 98,768 | 797 |  |  |
Cost of sales |  | (85,112) | 417 |  |  |
Gross profit (loss) |  | 13,656 | 1,214 |  |  |
Selling and administrative expenses |  | (12) | 0 |  |  |
Operating profit (loss) (Note 4) |  | 13,644 | 1,214 |  |  |
Other non-operating income |  | 0 | 0 |  |  |
Other non-operating expense |  | 0 | 0 |  |  |
Other gains, net |  | 0 | 0 |  |  |
Finance income |  | 0 | 0 |  |  |
Finance expenses (Notes 5,12 and 40) |  | 0 | 0 |  |  |
Profit related to associates, joint ventures and subsidiaries |  | 0 | 0 |  |  |
Profit (loss) before income tax |  | 13,644 | 1,214 |  |  |
Income tax benefit |  | 0 | 0 |  |  |
Profit (loss) for the year |  | 13,644 | 1,214 |  |  |
Loss attributable to owners of the controlling company |  | 10,533 | 730 |  |  |
Profit attributable to non-controlling interests |  | 3,111 | 484 |  |  |
Other comprehensive income (loss) |  | 0 | 0 |  |  |
Total comprehensive income (loss) for the year |  | 13,644 | 1,214 |  |  |
Total comprehensive loss attributable to owners of the controlling company |  | 10,533 | 730 |  |  |
Total comprehensive income (attributable to non-controlling interests |  | ₩ 3,111 | 484 |  |  |
Loss per share (in won), Basic | (per share) |  | ₩ 16 |  | 0 |  |
Loss per share (in won), Diluted | (per share) |  | ₩ 16 |  | 0 |  |
Cash flows from operating activities |  | ₩ 18,192 | 1 |  |  |
Cash flows from investing activities |  | (18,192) | (1) |  |  |
Cash flows from financing activities |  | 0 | 0 |  |  |
Currently stated |  |  |  |  |  |
Disclosure of voluntary change in accounting policy [line items] |  |  |  |  |  |
Current assets |  | 22,050,845 |  |  | 20,561,941 |
Non-current assets |  | 189,072,882 |  |  | 182,581,384 |
Total Assets (Notes 2 and 4) |  | 211,123,727 |  |  | 203,143,325 |
Current liabilities |  | 31,732,220 |  |  | 25,881,222 |
Non-current liabilities |  | 114,064,801 |  |  | 106,594,043 |
Total liabilities (Note 4) |  | 145,797,021 |  |  | 132,475,265 |
Contributed capital |  | 4,053,578 |  |  | 4,053,578 |
Retained earnings |  | 45,258,244 |  |  | 51,134,331 |
Other components of equity |  | 14,468,450 |  |  | 14,109,501 |
Non-controlling interests |  | 1,546,434 |  |  | 1,370,650 |
Total Equity (Note 2) |  | 65,326,706 |  |  | 70,668,060 |
Total Liabilities and Equity |  | 211,123,727 |  |  | ₩ 203,143,325 |
Sales |  | 60,673,587 | 57,926,634 |  |  |
Cost of sales |  | (63,644,290) | (51,804,179) |  |  |
Gross profit (loss) |  | (2,970,703) | 6,122,455 |  |  |
Selling and administrative expenses |  | (2,875,796) | (2,678,443) |  |  |
Operating profit (loss) (Note 4) |  | (5,846,499) | 3,444,012 |  |  |
Other non-operating income |  | 372,921 | 1,036,448 |  |  |
Other non-operating expense |  | (257,932) | (417,720) |  |  |
Other gains, net |  | 8,519 | 35,094 |  |  |
Finance income |  | 1,402,614 | 1,510,249 |  |  |
Finance expenses (Notes 5,12 and 40) |  | (3,245,777) | (2,896,443) |  |  |
Profit related to associates, joint ventures and subsidiaries |  | 494,584 | 281,107 |  |  |
Profit (loss) before income tax |  | (7,071,570) | 2,992,747 |  |  |
Income tax benefit |  | 1,855,989 | (899,064) |  |  |
Profit (loss) for the year |  | (5,215,581) | 2,093,683 |  |  |
Loss attributable to owners of the controlling company |  | (5,304,522) | 1,992,077 |  |  |
Profit attributable to non-controlling interests |  | 88,941 | 101,606 |  |  |
Other comprehensive income (loss) |  | 599,614 | (219,841) |  |  |
Total comprehensive income (loss) for the year |  | (4,615,967) | 1,873,842 |  |  |
Total comprehensive loss attributable to owners of the controlling company |  | (4,743,513) | 1,803,554 |  |  |
Total comprehensive income (attributable to non-controlling interests |  | ₩ 127,546 | 70,288 |  |  |
Loss per share (in won), Basic | (per share) |  | ₩ (8,263) |  | 3,102 |  |
Loss per share (in won), Diluted | (per share) |  | ₩ (8,263) |  | ₩ 3,102 |  |
Cash flows from operating activities |  | ₩ 4,491,378 | 13,208,474 |  |  |
Cash flows from investing activities |  | (12,372,520) | (14,831,812) |  |  |
Cash flows from financing activities |  | ₩ 8,435,077 | ₩ 1,880,824 |  |  |

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