Premises and Equipment
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Premises and Equipment
Premises and Equipment

Premises and equipment balances and estimated useful lives are as follows. 
 
Estimated
Useful Lives
 
December 31,
 
2015
 
2014
 
 
 
(Dollars in millions)
Land
—
 
$
58

 
$
66

Office buildings
7 — 31.5 years
 
149

 
144

Computer hardware and software
3 — 7 years
 
214

 
180

Furniture, fixtures and equipment
3 — 7 years
 
61

 
67

Total
 
 
482

 
457

Less accumulated depreciation
 
 
(232
)
 
(219
)
Premises and equipment, net
 
 
$
250

 
$
238



Depreciation expense amounted to approximately $26 million, $26 million and $23 million, for the years ended December 31, 2015, 2014 and 2013, respectively.

Operating Leases

The Company conducts a portion of its business from leased facilities. Such leases are considered to be operating leases based on their lease terms. Lease rental expense totaled approximately $7 million, $8 million and $8 million for the years ended December 31, 2015, 2014 and 2013, respectively. The following outlines the Company’s minimum contractual lease obligations. 
 
December 31, 2015
 
(Dollars in millions)
2016
$
4

2017
3

2018
2

2019
1

2020
1

Thereafter
1

Total
$
12