Investment Properties (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure Of Investment Property [Abstract]

Summary of Investment Properties

	December 31
	2018		2019
	NT$		NT$
	(In Millions)
Carrying amount
Investment properties	$	8,287	$	8,169

	Investment Properties
	NT$
	(In Millions)
Cost
Balance on January 1, 2017	$	9,195
Reclassification		(60	)
Balance on December 31, 2017	$	9,135
Accumulated depreciation and impairment
Balance on January 1, 2017	$	(1,080	)
Depreciation expense		(21	)
Reclassification		3
Reversal of impairment loss		11
Balance on December 31, 2017	$	(1,087	)
Cost
Balance on January 1, 2018	$	9,135
Additions		6
Reclassification		251
Balance on December 31, 2018	$	9,392
Accumulated depreciation and impairment
Balance on January 1, 2018	$	(1,087	)
Depreciation expense		(21	)
Reclassification		(16	)
Reversal of impairment loss		19
Balance on December 31, 2018	$	(1,105	)
Cost
Balance on January 1, 2019	$	9,392
Additions		1
Disposal		(6	)
Reclassification		(173	)
Balance on December 31, 2019	$	9,214
Accumulated depreciation and impairment
Balance on January 1, 2019	$	(1,105	)
Depreciation expense		(25	)
Disposal		6
Reclassification		22
Reversal of impairment loss		57
Balance on December 31, 2019	$	(1,045	)

Estimated Service Lives of Investment Properties

Depreciation expense is computed using the straight-line method over the following estimated service lives:

Land improvements	10-30 years
Buildings
Main buildings	35-60 years
Other building facilities	4-10 years

Key Assumptions and Fair Values of Investment Properties

The fair values of the Company’s investment properties as of December 31, 2018 and 2019 were determined by Level 3 fair value measurements inputs based on the appraisal reports conducted by independent appraisers.  Those appraisal reports are based on the comparison approach, income approach or cost approach.  Key assumptions and the fair values were as follows:

	December 31
	2018		2019
	NT$		NT$
	(In Millions)
Fair value	$	18,515	$	18,701
Overall capital interest rate	1.02%-4.04%		1.03%-4.04%
Profit margin ratio	12%-20%		12%-20%
Discount rate	—		—
Capitalization rate	0.79%-1.75%		0.79%-1.74%

Summary of Future Aggregate Lease Collection under Operating Lease for Freehold Plant, Property and Equipment

The future aggregate minimum lease payments under non-cancellable operating leases are as follows:

2018

	December 31, 2018
	NT$
	(In Millions)
Within one year	$	3,439
Longer than one year but within five years		6,375
Longer than five years		744
	$	10,558

The future aggregate minimum lease collection under non-cancellable operating leases is as follows:

	December 31, 2018
	NT$
	(In Millions)
Within one year	$	344
Longer than one year but within five years		580
Longer than five years		206
	$	1,130

2019

The future aggregate lease collection under operating lease for investment properties is as follows:

	December 31, 2019
	NT$
	(In Millions)
Year 1	$	113
Year 2		91
Year 3		71
Year 4		61
Year 5		39
Onwards		96
	$	471