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Statements of Appropriation of Retained Earnings (Disposition of Deficit) (Details) - KRW (₩)
₩ / shares in Units, ₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Appropriation of Retained Earnings [Line Items]      
Unappropriated retained earnings (deficit) carried over from prior years ₩ 17,349,625    
Profit (loss) (5,229,225) ₩ 2,092,469 ₩ (2,263,535)
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans ₩ 210,409 ₩ (69,804) ₩ 42,315
Dividend percentage 0.00% 24.32%  
Dividends proposed or declared before financial statements authorised for issue but not recognised as distribution to owners per share ₩ 0 ₩ 1,216  
Separate [member]      
Statement of Appropriation of Retained Earnings [Line Items]      
Unappropriated retained earnings (deficit) carried over from prior years ₩ 0 ₩ 0  
Profit (loss) (5,607,732) 1,951,498  
Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans 107,884 (67,118)  
Retained earnings before appropriations (5,499,848) 1,884,380  
Transfer from voluntary reserves 5,499,848 0  
Subtotal (I+II) 0 1,884,380  
Dividends (government, individual)(Amount of dividends per share (%) : Current year – ￦ 0 (0%), Prior year – ￦ 1,216 (24.32%)) 0 (780,628)  
Reserve for business expansion 0 (1,103,752)  
Appropriations of retained earnings 0 (1,884,380)  
Unappropriated retained earnings to be carried over forward to subsequent year ₩ 0 ₩ 0