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Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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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)

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