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Financial Risk Management - Summary of Gearing Ratios (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of detailed information about financial instruments [abstract] |  |  |  |
Total borrowings | ₩ 6,860,539 | ₩ 8,301,505 |  |
Less: cash and cash equivalents | (1,928,182) | (2,900,311) | ₩ (2,559,464) | ₩ (1,888,663)
Net debt | 4,932,357 | 5,401,194 |  |
Total equity | 13,049,130 | 12,782,718 | ₩ 12,156,131 | ₩ 11,787,557
Total capital | ₩ 17,981,487 | ₩ 18,183,912 |  |
Gearing ratio | 27.00% | 30.00% |  |

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