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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property and equipment, net
 
As of December 31,
2017
 
2016
(In millions)
Property and equipment, net:
 
 
 
Computer equipment and software
$
2,301

 
$
2,049

Internal use software and website development costs
1,828

 
1,372

Land and buildings
364

 
357

Leasehold improvements
388

 
335

Furniture and fixtures
129

 
119

Development in progress and other
148

 
268

Total property and equipment, gross
5,158

 
4,500

Accumulated depreciation
(3,630
)
 
(3,018
)
Total property and equipment, net
$
1,528

 
$
1,482