Intangible Assets (Schedule Of Intangible Assets) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	$ 459		$ 440
Amortized Intangible Assets, Accumulated Amortization	95		88
Amortized Intangible Assets, Net Carrying Amount	364		352
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	713		691
License Agreements [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	280	[1],[2]	272	[1],[2]
Amortized Intangible Assets, Accumulated Amortization	55	[1],[2]	52	[1],[2]
Amortized Intangible Assets, Net Carrying Amount	225	[1],[2]	220	[1],[2]
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	177	[1]	166	[1]
Amortized Intangible Assets, Accumulated Amortization	39	[1]	35	[1]
Amortized Intangible Assets, Net Carrying Amount	138	[1]	131	[1]
Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Amortized Intangible Assets, Gross Carrying Amount	2		2
Amortized Intangible Assets, Accumulated Amortization	1		1
Amortized Intangible Assets, Net Carrying Amount	1		1
Goodwill [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Goodwill, Gross Carrying Amount	713	[1],[2]	691	[1],[2]
Trademarks [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Unamortized Intangible Assets, Trademarks, Gross Carrying Amount	$ 568	[1]	$ 571	[1]

[1] The increases in carrying amounts reflect the acquisition of the Budget licensee for Edmonton.

[2] The increases in carrying amounts reflect the reacquired right to operate the Budget brand in Portugal.