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Property, Software and Equipment
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Software and Equipment
Property, Software and Equipment
 
Property, software and equipment consist of the following as of December 31 ($ in millions):
 
2018
 
2017
Land
$
201


$
130

Building
614


367

Computer software
757


542

Computer hardware
308

 
248

Furniture and office equipment
335


186

Leasehold improvements
291


221

 
2,506

 
1,694

Less accumulated depreciation
(800
)
 
(590
)
Property, software and equipment, net
$
1,706

 
$
1,104


 
Depreciation expense for the years ended December 31, 2018, 2017 and 2016 was $237 million, $161 million and $101 million, respectively.