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Other Assets - Summary of Other Assets (Detail) $ in Millions, $ in Millions | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Oct. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
--- | --- | --- | --- | ---
Miscellaneous Assets [Abstract] |  |  |  |
Spare parts | $ 2,336 |  |  | $ 2,422
Refundable deposits | 1,879 |  |  | 1,992
Other financial assets | 1,000 |  |  | 1,000
Deposit for mobile broadband license bidding | 1,000 |  | $ 1,000 | 0
Others | 2,316 |  |  | 2,342
Other assets | 8,531 |  |  | 7,756
Others | 94 |  |  | 154
Other current assets | 2,430 | $ 81 |  | 2,576
Others | 2,222 |  |  | 2,188
Other noncurrent assets | $ 6,101 | $ 204 |  | $ 5,180

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