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Operating Segments Information - Segment Revenue and Operating Results (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Disclosure of operating segments [line items] |  |  |  |
Net revenue from external customers | $ 977,447.2 | $ 32,977.3 | $ 947,938.3 | $ 843,497.4
Share of profits (loss) of associates and joint venture | 3,014.8 | 101.7 | 3,457.9 | 4,196.4
Income tax expense (benefit) | $ 51,122.9 | $ 1,724.8 | $ 54,124.4 | 47,644.7
Elimination [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net revenue from external customers |  |  |  | 843,497.4
Income (loss) from operations |  |  |  | 320,047.8
Share of profits (loss) of associates and joint venture |  |  |  | 4,196.4
Income tax expense (benefit) |  |  |  | 47,644.7
Foundry [member] | Operating segments [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net revenue from external customers |  |  |  | 842,690.2
Income (loss) from operations |  |  |  | 320,833.2
Share of profits (loss) of associates and joint venture |  |  |  | 4,582.0
Income tax expense (benefit) |  |  |  | 47,646.5
Others [member] | Operating segments [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net revenue from external customers |  |  |  | 807.2
Income (loss) from operations |  |  |  | (785.4)
Share of profits (loss) of associates and joint venture |  |  |  | (385.6)
Income tax expense (benefit) |  |  |  | $ (1.8)

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