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Other Assets - Summary of Other Assets (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($)
--- | --- | --- | ---
Miscellaneous Assets [Abstract] |  |  |
Spare parts | $ 2,156 |  | $ 2,336
Refundable deposits | 2,009 |  | 1,879
Other financial assets | 1,000 |  | 1,000
Deposit for mobile broadband license bidding (Note 19) | 0 |  | 1,000
Others | 2,450 |  | 2,316
Other assets | 7,615 |  | 8,531
Others | 193 |  | 94
Other current assets | 2,349 | $ 84 | 2,430
Others | 2,257 |  | 2,222
Other noncurrent assets | $ 5,266 | $ 188 | $ 6,101

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