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Financial Risk Management - Summary of Contractual Undiscounted Cash Flows (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | ₩ 8,953,444 | ₩ 9,264,193
Borrowings(including debentures) | 7,554,564 | 7,607,931
Other non-derivative financial liabilities | 175,633 | 178,113
Financial guarantee contracts | 65,760 | 26,738
Total | 16,749,401 | 17,076,975
Less than 1 year [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | 7,287,436 | 7,882,861
Borrowings(including debentures) | 1,507,232 | 1,623,996
Other non-derivative financial liabilities | 6,123 | 4,117
Financial guarantee contracts | 52,734 | 26,738
Total | 8,853,525 | 9,537,712
1-5 years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | 1,173,579 | 1,219,835
Borrowings(including debentures) | 3,669,060 | 3,666,726
Other non-derivative financial liabilities | 37,358 | 31,290
Financial guarantee contracts | 13,026 |
Total | 4,893,023 | 4,917,851
More than 5 years [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | 492,429 | 161,497
Borrowings(including debentures) | 2,378,272 | 2,317,209
Other non-derivative financial liabilities | 132,152 | 142,706
Total | ₩ 3,002,853 | ₩ 2,621,412

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