Subsequent Events (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended
	Apr. 18, 2014	Aug. 06, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2014 Subsequent Event [Member]	Jun. 30, 2014 Eight And One Over Four Senior Notes [Member]	Jun. 30, 2014 Eight And One Over Four Senior Notes [Member] Senior Notes [Member]	Mar. 31, 2014 Eight And One Over Four Senior Notes [Member] Senior Notes [Member]	Jul. 17, 2014 Avis Budget Rental Car Funding [Member] Debt Due For Rental Car Funding [Member] Subsequent Event [Member] Secured Debt [Member]
Subsequent Event [Line Items]
Stock Repurchase Program, Authorized Amount	$ 235	$ 200
Proceeds from issue of senior notes											500
Debt Instrument, Repurchased Face Amount									395	292
Early extinguishment of debt			$ 56	$ 91	$ 56	$ 131
Long-term Debt, Weighted Average Interest Rate											2.62%
Debt Instrument, Maturity Date, Description							February 2020	January 2019