Summary of Changes to Restructuring-Related Liabilities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Balance, beginning	$ 17	$ 22	$ 13
Restructuring expense	18	26	61
Balance, ending	11	17	22
Americas
Restructuring Cost and Reserve [Line Items]
Balance, beginning	4	1	1
Balance, ending	1	4	1
International
Restructuring Cost and Reserve [Line Items]
Balance, beginning	13	21	12
Balance, ending	10	13	21
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning	14	17	12
Balance, ending	10	14	17
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning	3	5	1
Balance, ending	1	3	5
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Balance, beginning	0	0	0
Balance, ending	0	0	0
2011 Avis Europe Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		21	40
Cash payment/utilization	(9)	(30)	(31)
2011 Avis Europe Restructuring [Member] | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring expense		4	7
Cash payment/utilization	(1)	(4)	(7)
2011 Avis Europe Restructuring [Member] | International
Restructuring Cost and Reserve [Line Items]
Restructuring expense		17	33
Cash payment/utilization	(8)	(26)	(24)
2011 Avis Europe Restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		20	34
Cash payment/utilization	(7)	(27)	(29)
2011 Avis Europe Restructuring [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		1	6
Cash payment/utilization	(2)	(3)	(2)
2011 Avis Europe Restructuring [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense		0	0
Cash payment/utilization	0	0	0
2012 Truck Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			21
Cash payment/utilization			(21)
2012 Truck Restructuring [Member] | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring expense			21
Cash payment/utilization			(21)
2012 Truck Restructuring [Member] | International
Restructuring Cost and Reserve [Line Items]
Restructuring expense			0
Cash payment/utilization			0
2012 Truck Restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			0
Cash payment/utilization			0
2012 Truck Restructuring [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			0
Cash payment/utilization			0
2012 Truck Restructuring [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense			21
Cash payment/utilization			$ (21)
2014 T15 Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	9	5
Cash payment/utilization	(12)	(1)
2014 T15 Restructuring [Member] | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring expense	6	4
Cash payment/utilization	(8)	(1)
2014 T15 Restructuring [Member] | International
Restructuring Cost and Reserve [Line Items]
Restructuring expense	3	1
Cash payment/utilization	(4)	0
2014 T15 Restructuring [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	9	5
Cash payment/utilization	(12)	(1)
2014 T15 Restructuring [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	0	0
Cash payment/utilization	0	0
2014 T15 Restructuring [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	0	0
Cash payment/utilization	0	$ 0
2015 Acquisition Integration [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	9
Cash payment/utilization	(3)
2015 Acquisition Integration [Member] | Americas
Restructuring Cost and Reserve [Line Items]
Restructuring expense	1
Cash payment/utilization	(1)
2015 Acquisition Integration [Member] | International
Restructuring Cost and Reserve [Line Items]
Restructuring expense	8
Cash payment/utilization	(2)
2015 Acquisition Integration [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	9
Cash payment/utilization	(3)
2015 Acquisition Integration [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	0
Cash payment/utilization	0
2015 Acquisition Integration [Member] | Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expense	0
Cash payment/utilization	$ 0