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Business Combinations (Tables)
3 Months Ended
Mar. 31, 2019
Business Combinations [Abstract]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed The aggregate purchase consideration was allocated as follows (in millions):
 
Motors.co.uk
Goodwill
$
65

Purchased intangible assets
30

Net liabilities
(2
)
Total
$
93