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Other Assets - Summary of Other Assets (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Assets [abstract]      
Tax receivable $ 3,780.3   $ 4,021.6
Prepaid expenses 1,298.7   1,559.9
Others 1,912.0   1,624.0
Other assets, total 6,991.0   7,205.5
Current portion 5,406.4 $ 176.6 4,222.4
Noncurrent portion 1,584.6 $ 51.8 2,983.1
Other assets, total $ 6,991.0   $ 7,205.5