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Operating Segments Information - Major Customers Representing at Least 10 Percent of Net Revenue (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Disclosure of major customers [line items] |  |  |  |
NET REVENUE | $ 1,031,473.6 | $ 33,697.3 | $ 977,447.2 | $ 947,938.3
Customer A [member] |  |  |  |
Disclosure of major customers [line items] |  |  |  |
NET REVENUE | $ 224,690.7 |  | $ 220,463.1 | $ 161,261.4
Percentage of entity's revenue | 22.00% | 22.00% | 23.00% | 17.00%
Customer B [member] |  |  |  |
Disclosure of major customers [line items] |  |  |  |
NET REVENUE | $ 59,149.0 |  | $ 63,805.9 | $ 106,541.9
Percentage of entity's revenue | 6.00% | 6.00% | 7.00% | 11.00%

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