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Other Payables - Summary of Other Payables (Detail)
$ in Millions, $ in Millions
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Trade And Other Current Payables [Abstract]      
Accrued salary and compensation $ 9,041   $ 9,748
Accrued compensation to employees and remuneration to directors and supervisors 1,739   1,949
Payables to contractors 1,710   2,058
Payables to equipment suppliers 1,459   1,690
Amounts collected for others 1,226   1,203
Accrued franchise fees 1,151   1,248
Accrued maintenance costs 1,050   1,081
Others 5,939   6,024
Total $ 23,315 $ 762 $ 25,001