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Investments Accounted for Using Equity Method - Summarized Financial Information of Associates (Systems on Silicon Manufacturing Company Pte Ltd.) (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($) | Dec. 31, 2017 USD ($)
Disclosure of associates [line items] |  |  |  |  |
Current assets | $ 857,203.1 |  | $ 817,729.1 |  | $ 28,920.5
Noncurrent assets | 1,134,528.9 |  | 1,068,567.6 |  | 38,276.9
Current liabilities | 386,890.2 |  | 348,286.0 |  | 13,053.0
Noncurrent liabilities | 110,395.3 |  | 178,164.9 |  | $ 3,724.5
NET REVENUE | 977,447.2 | $ 32,977.3 | 947,938.3 | $ 843,497.4 |
Total comprehensive income | $ 316,217.4 | $ 10,668.6 | 320,730.1 | 288,118.7 |
Systems on Silicon Manufacturing Company Pte Ltd. [member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Current assets |  |  | 14,585.1 |  |
Noncurrent assets |  |  | 5,360.1 |  |
Current liabilities |  |  | 1,746.6 |  |
Noncurrent liabilities |  |  | 286.3 |  |
NET REVENUE |  |  | 14,045.9 | 15,026.0 |
Income from operations |  |  | 4,921.7 | 5,802.3 |
Net income |  |  | 4,918.1 | 5,904.6 |
Total comprehensive income |  |  | 4,918.1 | 5,904.6 |
Cash dividends received |  |  | $ 4,076.2 | $ 1,556.6 |

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