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Financial Risk Management - Summary of Contractual Undiscounted Cash Flows (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | ₩ 9,262,238 | ₩ 9,021,467
Borrowings (including debentures) | 7,607,931 | 9,327,424
Other non-derivative financial liabilities | 12,569 | 26,422
Financial guarantee contracts | 26,738 | 56,373
Total | 16,909,476 | 18,431,686
Less than 1 year [member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | 7,880,906 | 7,682,604
Borrowings (including debentures) | 1,623,996 | 2,034,524
Other non-derivative financial liabilities | 4,117 | 233
Financial guarantee contracts | 26,738 | 56,373
Total | 9,535,757 | 9,773,734
1-5 years [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | 1,219,835 | 1,121,452
Borrowings (including debentures) | 3,666,726 | 4,834,151
Other non-derivative financial liabilities | 8,452 | 3,272
Total | 4,895,013 | 5,958,875
More than 5 years [Member] |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |
Trade and other payables | 161,497 | 217,411
Borrowings (including debentures) | 2,317,209 | 2,458,749
Other non-derivative financial liabilities |  | 22,917
Total | ₩ 2,478,706 | ₩ 2,699,077

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