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Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of financial assets [line items]        
Trade receivables ₩ 3,054,665   ₩ 2,959,622  
Other receivables 2,625,684   3,004,943  
Trade and other receivables, net 5,680,349 ₩ 5,969,040 5,964,565 ₩ 5,477,634
Trade receivables 381,681   352,695  
Other receivables 461,314   476,137  
Trade and other receivables, net 842,995 ₩ 826,547 828,832 ₩ 709,011
Gross carrying amount [member]        
Disclosure of financial assets [line items]        
Trade receivables 3,422,086   3,405,947  
Other receivables 2,700,792   3,071,532  
Trade and other receivables, net 6,122,878   6,477,479  
Trade receivables 402,027   366,108  
Other receivables 506,061   522,458  
Trade and other receivables, net 908,088   888,566  
Allowance for doubtful accounts [member]        
Disclosure of financial assets [line items]        
Trade receivables     (438,817)  
Other receivables     (66,402)  
Trade and other receivables, net     (505,219)  
Trade receivables     (610)  
Other receivables     (17,970)  
Trade and other receivables, net     (18,580)  
Expected credit losses [member]        
Disclosure of financial assets [line items]        
Trade receivables (357,548)      
Other receivables (74,948)      
Trade and other receivables, net (432,496)      
Trade receivables (2,376)      
Other receivables (18,874)      
Trade and other receivables, net (21,250)      
Present value discount [member]        
Disclosure of financial assets [line items]        
Trade receivables (9,873)   (7,508)  
Other receivables (160)   (187)  
Trade and other receivables, net (10,033)   (7,695)  
Trade receivables (17,970)   (12,803)  
Other receivables (25,873)   (28,351)  
Trade and other receivables, net ₩ (43,843)   ₩ (41,154)