Short-Term Loans (Tables)

12 Months Ended

Dec. 31, 2018

Short-term loans [Member]

Disclosure of detailed information about borrowings [Line Items]

Summary of Loans

	December 31
	2017		2018
	NT$		NT$
	(In Millions)
Unsecured loans	$	70	$	100

The annual interest rates of loans were as follows:

	December 31
	2017	2018
Unsecured loans	2.15%-2.19%	1.35%-2.35%