Vehicle Rental Activities (Components Of Vehicle Depreciation And Lease Charges) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Vehicle Rental Activities [Abstract]
Other Receivables	$ 170	$ 154	$ 170	$ 154
Depreciation expense	491	455	898	808
Lease charges	39	23	76	57
Gain on sales of vehicles, net	(13)	(2)	(24)	(2)
Cost of Services, Depreciation	$ 517	$ 476	$ 950	$ 863