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Basis of Preparation - Summary of Change in Accounting Policy (Details)
₩ / shares in Units, ₩ in Millions
 12 Months Ended
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