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Segment Information - Additional Information (Detail)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Mar. 31, 2015
Segment
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Segment Reporting Information [Line Items]          
Number of reportable segments   4      
eLong, Inc          
Segment Reporting Information [Line Items]          
stock based compensation and intangible amortization | $ $ 15   $ 6 $ 20 $ 11