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Investment Properties - Summary of Investment Properties (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about investment property [line items]    
Beginning balance ₩ 1,148,044 ₩ 1,102,070
Acquisition 48,850 160,606
Disposal/Abandonment (9,927) (7,639)
Depreciation (47,295) (43,575)
Transfer from (to) property, plant and equipment (61,472)  
Transfer   (63,418)
Transfer and others (11,613)  
Ending balance 1,189,531 1,148,044
Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 1,501,400 1,426,234
Ending balance 1,590,018 1,501,400
Accumulated Depreciation and Amortisation [Member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (353,356) (324,164)
Ending balance (400,487) (353,356)
Land [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 302,750 340,790
Acquisition   51
Disposal/Abandonment (3,493) (5,837)
Transfer from (to) property, plant and equipment (64,449)  
Transfer   (32,254)
Transfer and others (6,916)  
Ending balance 356,790 302,750
Land [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 302,750 340,790
Ending balance 358,358 302,750
Land [member] | Accumulated Depreciation and Amortisation [Member]    
Disclosure of detailed information about investment property [line items]    
Ending balance (1,568)  
Buildings [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 766,529 687,072
Acquisition 775 417
Disposal/Abandonment (6,434) (1,802)
Depreciation (47,295) (43,575)
Transfer from (to) property, plant and equipment 1,793  
Transfer   124,417
Transfer and others 80,986  
Ending balance 792,768 766,529
Buildings [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 1,119,885 1,011,236
Ending balance 1,191,687 1,119,885
Buildings [member] | Accumulated Depreciation and Amortisation [Member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance (353,356) (324,164)
Ending balance (398,919) (353,356)
Construction-in-progress [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 78,765 74,208
Acquisition 48,075 160,138
Transfer from (to) property, plant and equipment 1,184  
Transfer   (155,581)
Transfer and others (85,683)  
Ending balance 39,973 78,765
Construction-in-progress [member] | Gross carrying amount [member]    
Disclosure of detailed information about investment property [line items]    
Beginning balance 78,765 74,208
Ending balance ₩ 39,973 ₩ 78,765