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Equity - Appropriations of Earnings and Dividends Per Share (Detail) $ / shares in Units, $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 TWD ($) $ / shares | Dec. 31, 2017 TWD ($) $ / shares | Dec. 31, 2016 TWD ($) $ / shares | Dec. 31, 2018 USD ($)
Special capital reserve | $ 276,033.9 | $ 241,722.7 |  | $ 9,017.8
Total | $ (207,443.0) | $ (181,512.7) | $ (155,582.3) |
Cash dividends to shareholders | $ / shares | $ 8 | $ 8 | $ 7 |
Appropriation of earnings [member] |  |  |  |
Legal capital reserve | $ 35,113.1 | $ 34,311.2 | $ 33,424.7 |
Special capital reserve | (11,459.5) | 26,907.5 |  |
Cash dividends to shareholders | 207,443.0 | 207,443.0 | 181,512.7 |
Total | $ 231,096.6 | $ 268,661.7 | $ 214,937.4 |

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- Definition The amount of dividends recognised as distributions to owners of the parent. [Refer: Parent [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount, per share, of dividends recognised as distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 107 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_107&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in equity resulting from the appropriation of retained earnings. [Refer: Retained earnings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in equity resulting from transfers to a statutory reserve. [Refer: Statutory reserve] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_106_d&doctype=Standard -URIDate 2018-03-16 + Details
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