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Business Combinations (Tables)
 12 Months Ended
Dec. 31, 2017
Business Combinations [Abstract]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed The aggregate purchase consideration of our 2016 acquisitions was allocated as follows (in millions):
 
Ticketbis
 
Other
 
Total
Purchased intangible assets
$
48

 
$
28

 
$
76

Goodwill
128

 
57

 
185

Net liabilities
(35
)
 
(14
)
 
(49
)
Total
$
141

 
$
71

 
$
212