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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment
Property and equipment as of December 31, 2018 and 2017 consists of the following (in millions):

 
2018
 
2017
Land
$
31

 
$
31

Buildings
235

 
228

Leasehold improvements
135

 
158

Computer equipment
1,047

 
1,073

Furniture, fixtures, and other equipment
197

 
167

 
1,645

 
1,657

Accumulated depreciation and amortization
(1,058
)
 
(1,047
)
Total property and equipment, net
$
587

 
$
610