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Other Assets and Liabilities - Summary of Other Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jan. 01, 2017
--- | --- | --- | --- | ---
Other assets |  |  |  |
Advance payments | ₩ 162,784 |  | ₩ 164,950 |
Prepaid expenses | 1,667,372 |  | 241,078 |
Contract assets | 398,797 |  |  |
Others | 4,490 |  | 5,997 |
Less: Non-current | (545,895) | ₩ (529,783) | (107,165) | ₩ (106,099)
Current | 1,687,548 | 1,589,293 | 304,860 | 311,135
Other liabilities |  |  |  |
Advances received | 518,914 |  | 375,792 |
Withholdings | 89,403 |  | 85,142 |
Unearned revenue | 39,528 |  | 23,036 |
Contract liabilities | 347,462 |  |  |
Others | 24,908 |  | 11,628 |
Less: Non-current | (423,626) | (286,783) | (237,284) | (58,761)
Current | ₩ 596,589 | ₩ 494,079 | ₩ 258,314 | ₩ 342,291

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