Vehicle Rental Activities (Components Of Vehicle Depreciation And Lease Charges) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Vehicle Rental Activities [Abstract]
Other Receivables	$ 235	$ 251	$ 235	$ 251
Depreciation expense	516	499	953	931
Lease charges	54	42	97	76
(Gain) loss on sale of vehicles, net	27	(9)	51	(12)
Vehicle depreciation and lease charges, net	$ 597	$ 532	$ 1,101	$ 995