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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, 2019
KRW (₩)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
JPY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
PLN (zł)
Dec. 31, 2019
VND (₫)
Dec. 31, 2018
KRW (₩)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
JPY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
PLN (zł)
Dec. 31, 2018
VND (₫)
Dec. 31, 2017
KRW (₩)
Dec. 31, 2016
KRW (₩)
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                                    
Cash and cash equivalents ₩ 3,336,003               ₩ 2,365,022               ₩ 2,602,560 ₩ 1,558,696
Trade accounts and notes receivable 3,154,080               2,829,163                  
Non-trade receivable 463,614               159,238                  
Trade accounts and notes payable (2,353,355)                                  
Other accounts payable (4,397,121)               ₩ (3,566,629)                  
Financial liabilities ₩ 20,617,444                                  
Currency risk [member]                                    
Disclosure of nature and extent of risks arising from financial instruments [Line Items]                                    
Cash and cash equivalents   $ 1,594 ¥ 68 ¥ 8,360 $ 33 € 5 zł 25 ₫ 28,663   $ 790 ¥ 83 ¥ 5,515 $ 121 € 8 zł 206 ₫ 2,070,889    
Trade accounts and notes receivable   2,485 19 550           2,175 7 1,098            
Non-trade receivable   276 455 230 3 2 0 13,131   21 852 201 3 4   23,182    
Other assets denominated in foreign currencies   29 526 5,668 369 5 503 4,032   33 220 11,157 108 12 23 2,782    
Trade accounts and notes payable   (628) (9,043) (2,289)       (291,891)   (863) (12,501) (2,862)       (355,390)    
Other accounts payable   (488) (12,396) (3,239) (4) (10) 0 (786,356)   (928) (20,326) (4,762) (6) (3) (4) (1,585,130)    
Financial liabilities   (4,255)   (20,436)           (2,571)   (5,198)            
Aggregate notional amounts in the consolidated statements of financial position   (987) (20,371) (11,156) 401 2 528 (1,032,421)   (1,343) (31,665) 5,149 226 21 225 156,333    
Currency swap contracts | $   2,085               780                
Net exposure   $ 1,098 ¥ (20,371) ¥ (11,156) $ 401 € 2 zł 528 ₫ (1,032,421)   $ (563) ¥ (31,665) ¥ 5,149 $ 226 € 21 zł 225 ₫ 156,333