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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
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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) |

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