Other Assets (Tables)

12 Months Ended

Dec. 31, 2019

Miscellaneous Assets [Abstract]

Summary of Other Assets

	December 31
	2018		2019
	NT$		NT$
	(In Millions)
Spare parts	$	2,422	$	2,336
Refundable deposits		1,992		1,879
Other financial assets		1,000		1,000
Deposit for mobile broadband license bidding		—		1,000
Others		2,342		2,316
	$	7,756	$	8,531
Current
Spare parts	$	2,422	$	2,336
Others		154		94
	$	2,576	$	2,430
Noncurrent
Refundable deposits	$	1,992	$	1,879
Other financial assets		1,000		1,000
Deposit for mobile broadband license bidding		—		1,000
Others		2,188		2,222
	$	5,180	$	6,101