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Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]    
Trade receivables ₩ 3,150,395 ₩ 3,054,665
Other receivables 2,708,301 2,625,684
Trade and other receivables, net 5,858,696 5,680,349
Trade receivables 827,146 381,681
Other receivables 354,652 461,314
Trade and other receivables, net 1,181,798 842,995
Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Trade receivables 3,451,107 3,422,086
Other receivables 2,787,144 2,700,792
Trade and other receivables, net 6,238,251 6,122,878
Trade receivables 874,860 402,027
Other receivables 382,468 506,061
Trade and other receivables, net 1,257,328 908,088
Provision for impairment [member]    
Disclosure of financial assets [line items]    
Trade receivables (291,202) (357,548)
Other receivables (78,572) (74,948)
Trade and other receivables, net (369,774) (432,496)
Trade receivables (4,117) (2,376)
Other receivables (5,108) (18,874)
Trade and other receivables, net (9,225) (21,250)
Present value discount [member]    
Disclosure of financial assets [line items]    
Trade receivables (9,510) (9,873)
Other receivables (271) (160)
Trade and other receivables, net (9,781) (10,033)
Trade receivables (43,597) (17,970)
Other receivables (22,708) (25,873)
Trade and other receivables, net ₩ (66,305) ₩ (43,843)