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Other Assets - Summary of Other Assets (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($)
--- | --- | --- | ---
Miscellaneous Assets [Abstract] |  |  |
Spare parts | $ 2,422 |  | $ 2,059
Refundable deposits | 1,992 |  | 1,860
Other financial assets | 1,000 |  | 1,000
Others | 2,342 |  | 2,800
Other assets | 7,756 |  | 7,719
Others | 154 |  | 124
Other current assets | 2,576 | $ 84 | 2,183
Others | 2,188 |  | 2,676
Other noncurrent assets | $ 5,180 | $ 169 | $ 5,536

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