Vehicle Rental Activities (Components Of Vehicle Depreciation And Lease Charges) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Vehicle Rental Activities [Abstract]
Other Receivables	$ 627	$ 500	$ 627	$ 500
Depreciation expense	519	487	1,417	1,295
Lease charges	51	45	127	102
(Gain) loss on sales of vehicles, net	12	(8)	(12)	(10)
Cost of Services, Depreciation	$ 582	$ 524	$ 1,532	$ 1,387