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Net Income and Other Comprehensive Income (Loss) - Other Income (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Analysis Of Income And Expense [Abstract] |  |  |  |
Dividend income | $ 296 | $ 10 | $ 396 | $ 328
Rental income | 85 |  | 70 | 61
Others | 150 |  | 234 | 447
Other income | $ 531 | $ 18 | $ 700 | $ 836

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- Definition The amount of income recognised from rental activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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