Vehicle Rental Activities (Components Of Vehicle Depreciation And Lease Charges) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Vehicle Rental Activities [Abstract]
Other Receivables	$ 251		$ 251		$ 217
Depreciation expense	499	$ 490	931	$ 913
Lease charges	42	35	76	68
Gain on sale of vehicles, net	(9)	(27)	(12)	(51)
Vehicle depreciation and lease charges, net	$ 532	$ 498	$ 995	$ 930