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Financial Risk Management - Exposure to Foreign Currency Risk Based on Notional Amounts (Detail)
€ in Millions, ₫ in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, zł in Millions, $ in Millions, $ in Millions
Dec. 31, 2022
KRW (₩)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
JPY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
PLN (zł)
Dec. 31, 2022
VND (₫)
Dec. 31, 2021
KRW (₩)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
JPY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2021
PLN (zł)
Dec. 31, 2021
VND (₫)
Dec. 31, 2020
KRW (₩)
Dec. 31, 2019
KRW (₩)
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                                    
Cash and cash equivalents ₩ 1,824,649               ₩ 3,541,597               ₩ 4,218,099 ₩ 3,336,003
Deposits in banks 1,722,618               743,316                  
Trade accounts and notes receivable 2,358,914               4,574,789                  
Trade accounts and notes payable (935,739)               (1,074,089)                  
Other accounts payable (3,242,929)               ₩ (3,401,346)                  
Financial liabilities ₩ 24,359,595                                  
Currency risk [member]                                    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                                    
Cash and cash equivalents   $ 1,040 ¥ 228 ¥ 1,984 $ 25 € 1 zł 1 ₫ 151,912   $ 1,138 ¥ 195 ¥ 11,024 $ 29 € 3 zł 3 ₫ 44,525    
Deposits in banks   69   8,888               3,564            
Trade accounts and notes receivable   1,725 103 703           3,708 221 568            
Other accounts receivables   26 114 253 10 21   15,800   24 71 297 4     15,828    
Other assets denominated in foreign currencies   30 191 82 7     11,353     176 167 6     6,481    
Trade accounts and notes payable   (1,824) (4,987) (1,306)       (478,926)   (2,170) (8,850) (2,343)       (465,390)    
Other accounts payable   (565) (19,084) (1,711) (8) (10)   (2,681,508)   (1,227) (4,630) (2,203) (5) (5)   (1,610,640)    
Financial liabilities   (4,846)   (20,569)           (4,257)   (18,017)            
Aggregate notional amounts in the consolidated statements of financial position   (4,345) (23,435) (11,676) 34 12 1 (2,981,369)   (2,784) (12,817) (6,943) 34 (2) 3 (2,009,196)    
Cross currency interest rate swap contracts | $   2,430               1,545                
Net exposure   $ (1,915) ¥ (23,435) ¥ (11,676) $ 34 € 12 zł 1 ₫ (2,981,369)   $ (1,239) ¥ (12,817) ¥ (6,943) $ 34 € (2) zł 3 ₫ (2,009,196)