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Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Trade receivables ₩ 3,056,130 ₩ 3,150,395
Other receivables 1,846,341 2,708,301
Trade and other receivables, net 4,902,471 5,858,696
Trade receivables 853,953 827,146
Other receivables 396,816 354,652
Trade and other receivables, net 1,250,769 1,181,798
Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Trade receivables 3,388,099 3,451,107
Other receivables 1,948,108 2,787,144
Trade and other receivables, net 5,336,207 6,238,251
Trade receivables 892,992 874,860
Other receivables 513,926 382,468
Trade and other receivables, net 1,406,918 1,257,328
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of financial assets [line items]    
Trade receivables (322,992) (291,202)
Other receivables (101,619) (78,572)
Trade and other receivables, net (424,611) (369,774)
Trade receivables (4,323) (4,117)
Other receivables (102,985) (5,108)
Trade and other receivables, net (107,308) (9,225)
Present value discount [member]    
Disclosure of financial assets [line items]    
Trade receivables (8,977) (9,510)
Other receivables (148) (271)
Trade and other receivables, net (9,125) (9,781)
Trade receivables (34,716) (43,597)
Other receivables (14,125) (22,708)
Trade and other receivables, net ₩ (48,841) ₩ (66,305)