Vehicle Rental Activities (Components Of Vehicle Depreciation And Lease Charges) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Vehicle Rental Activities [Abstract]
Other Receivables	$ 586		$ 586		$ 635
Depreciation expense	523	$ 510	1,453	$ 1,423
Lease charges	57	52	133	120
Gain on sale of vehicles, net	(4)	(7)	(15)	(58)
Vehicle depreciation and lease charges, net	$ 576	$ 555	$ 1,571	$ 1,485