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Other Assets - Summary of Other Assets (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
--- | --- | --- | ---
Miscellaneous Assets [Abstract] |  |  |
Spare parts | $ 2,059 |  | $ 1,776
Refundable deposits | 1,860 |  | 2,083
Other financial assets | 1,000 |  | 1,000
Others | 2,800 |  | 2,288
Other assets | 7,719 |  | 7,147
Others | 124 |  | 346
Other current assets | 2,183 | $ 74 | 2,122
Other financial assets | 1,000 |  | 1,000
Others | 2,676 |  | 1,942
Other noncurrent assets | $ 5,536 | $ 187 | $ 5,025

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