Vehicle Rental Activities (Components Of Vehicle Depreciation And Lease Charges) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Vehicle Rental Activities [Abstract]
Other Receivables	$ 635	$ 627	$ 635	$ 627
Depreciation expense	510	519	1,423	1,417
Lease charges	52	51	120	127
(Gain) loss on sale of vehicles, net	(7)	12	(58)	(12)
Vehicle depreciation and lease charges, net	$ 555	$ 582	$ 1,485	$ 1,532