Consolidated Statements Of Operations - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues
Vehicle rental									$ 6,026	$ 6,026	$ 5,707
Other									2,476	2,459	2,230
Net revenues									8,502	8,485	7,937
Expenses
Operating									4,284	4,251	4,074
Vehicle depreciation and lease charges, net									1,933	1,996	1,811
Selling, general and administrative									1,093	1,080	1,019
Vehicle interest, net									289	282	264
Non-vehicle related depreciation and amortization									218	180	152
Interest expense related to corporate debt, net:
Interest expense									194	209	228
Early extinguishment of debt									23	56	147
Transaction-related costs, net									68	13	51
Restructuring expense									18	26	61
Impairment									0	0	33
Total expenses									8,120	8,093	7,840
Income before income taxes									382	392	97
Provision for income taxes									69	147	81
Net income									$ 313	$ 245	$ 16
Earnings (loss) per share
Basic (in dollars per share)	$ (0.06)	$ 1.80	$ 1.36	$ (0.09)	$ 0.22	$ 1.84	$ 0.25	$ 0.03	$ 3.02	$ 2.32	$ 0.15
Diluted (in dollars per share)	$ (0.06)	$ 1.77	$ 1.34	$ (0.09)	$ 0.21	$ 1.74	$ 0.24	$ 0.03	$ 2.98	$ 2.22	$ 0.15